case study questions class 9 chemistry chapter 1

Book Solutions
State Boards

Case Study Questions Class 9 Science Matter in our Surroundings

Case study questions class 9 science chapter 1 matter in our surroundings.

CBSE Class 9 Case Study Questions Science Matter in our Surroundings. Important Case Study Questions for Class 9 Exam. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Matter in our Surroundings.

At Case Study Questions there will given a Paragraph. In where some Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks or 4 marks.

CBSE Case Study Questions Class 9 Science – Matter in our Surroundings

Case study 1:.

1.) A matter is anything that has mass and occupies space. Pen, paper, clips, sand, air, ice, etc. are different forms of matter. Every matter is made up of small particles. These particles are so tiny that they can’t be seen with naked eyes. Let’s see about the different characteristics of particles of matter.

All matter is made up of very small particles.
.Particles of matter has spaces between them.
Particles of matter are continuously moving.
Particles of matter attract each other.

Answer the following questions by referring above paragraph.

i.) Which of following is not matter?

c.) smell of perfume

d.) None of these

ii.) Thoughts coming in our mind are example of matter. True or false

c.) None of these

iii.) Which of the following is true about particles of matter?

a.) Particles of matter has spaces between them

b.) Particles of matter are continuously moving

c.) Particles of matter attract each other

d.) All of these

iv.) Give 5 examples of matter in our surroundings

v.) Enlist all properties of particles of matter

Answer key-1

iv.) pen, pencil, notebook, ice and water

v.) Different characteristics of particles of matter are

Case Study 2:

2.) There are three states of matter – solid, liquid and gas.

Solids have a definite shape, distinct boundaries and fixed volumes, that is, have negligible compressibility. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid.

Liquids have no fixed shape but have a fixed volume. They take up the shape of the container in which they are kept. Liquids flow and change shape, so they are not rigid but can be called fluid.

Gas as has indefinite shape, no fixed volume. Gas gets the shape and volume of container.

Gas has very low density hence are light. Gas can flow easily and hence are called fluid.

i.) Which of the following state of matter takes shape of container in which it is filled?

d.) Both b and c

ii.) Distance between particles of matter least in

iii.) Compressibility is least in case of

iv.) Give properties of solids.

v.) Give properties of Gases.

Answer key-2

iv.) properties of solid are given below

Solid has fixed volume.
Solid has fixed shape.
Solid has high density.
Solids are heavy.
Solid does not flow.

v.) Properties of gases are

Gas has indefinite shape
Gas has no fixed volume.
Gas gets the shape and volume of container.
Gas fills the container completely.
Gas has very low density.
Because of low density gas are light.
Gas can flow easily and hence are called fluid.

Case Study 3:

3.) What happens inside the matter during change of state? On increasing the temperature of solids, the kinetic energy of the particles increases. Due to the increase in kinetic energy, the

Particles start vibrating with greater speed. The energy supplied by heat overcomes the forces of attraction between the particles. The particles leave their fixed positions and start moving more freely. A stage is reached when the solid melts and is converted to a liquid. The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

The temperature of the system does not change after the melting point is reached, till all the ice melts. This happens even though we continue to heat the beaker, that is, we continue to supply heat. This heat gets used up in changing the state by overcoming the forces of attraction between the particles. The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion. So, particles in water at 0 0 C (273 K) have more energy as compared to particles in ice at the same temperature.

The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point. Boiling is a bulk phenomenon. Particles from the bulk of the liquid gain enough energy to change into the vapour state. A change of state directly from solid to gas without changing into liquid state is called sublimation and the direct change of gas to solid without changing into liquid is called deposition.

i.) A change of state directly from solid to gas without changing into liquid state is called

a.) Sublimation

b.) Deposition

c.) Boiling point

ii.) The direct change of gas to solid without changing into liquid is called

iii.) The energy supplied by heat to solid is used to overcome the forces of attraction between the particles. True or false

iv.) Define melting point and boiling point

v.) Define latent heat of fusion

Answer key-3

iv.) The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point.

v.) The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.

Case Study 4:

4 .) Do we always need to heat or change pressure for changing the state of matter? Can you quote some examples from everyday life where change of state from liquid to vapour takes place without the liquid reaching the boiling point? In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, is able to break away from the forces of attraction of other particles and gets converted into vapour. This phenomenon of change of a liquid into vapors at any temperature below its boiling point is called evaporation.

i.) Evaporation of liquid takes place at

a.) Boiling point

b.) Above boiling point

c.) Below boiling point

ii.) Evaporation takes place at surface of liquid because

a.) They are heavy as compare to other particles

b.) They have sufficient kinetic energy to break the force

c.) They are light weight as compare to other particles

iii.) During evaporation particles of liquid change into vapour

a.) From the surface

b.) From the bottom

c.) From all over the liquid

iv.) Define evaporation.

v.) Explain process of evaporation

Answer key-4

iv.) The phenomenon of change of a liquid into vapors at any temperature below its boiling point is called evaporation.

v.) In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, is able to break away from the forces of attraction of other particles and gets converted into vapour. This phenomenon of change of a liquid into vapors at any temperature below its boiling point is called evaporation.

Case Study 5:

5.) You must have observed that the rate of evaporation increases with–

an increase of surface area:
We know that evaporation is a surface phenomenon. If the surface area is increased, the rate of evaporation increases. For example, while putting clothes for drying up we spread them out.
an increase of temperature:

With the increase of temperature, more number of particles get enough kinetic energy to go into the vapour state.

In an open vessel, the liquid keeps on evaporating. The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings makes the surroundings cold. What happens when you pour some acetone (nail polish remover) on your palm? The particles gain energy from your palm or surroundings and evaporate causing the palm to feel cool. After a hot sunny day, people sprinkle water on the roof or open ground because the large latent heat of vaporization of water helps to cool the hot surface.

i.) Evaporation is surface phenomenon. True or false

ii.) As temperature increases the rate of evaporation is

a.) increases

b.) decreases

c.) remains constant

iii.) The rate of evaporation increases with

a.) Increase in wind speed

b.) Decrease in wind speed

c.) Does not have any effect from wind speed

iv.) What happens when you pour some acetone (nail polish remover) on your palm?

v.) We are able to sip hot tea from saucer than from cup. Why?

Answer key-5

iv.) The particles gain energy from your palm or surroundings and evaporate causing the palm to feel cool.

v.) We are able to sip hot tea from saucer than from cup. This is because saucer has large surface area, due to large surface area as compare to cut area tea evaporates at faster rate.

Thank you It helped me a lot

Why smell of Perfume is not a matter?

Because there is no particle

Because their are perfume particles suspended in air

These all case study questions are really helpful . Thanks

This is my first I was so nervous but these questions help me alot thank you

Smell of perfume is a matter because it have gas particles means perfume particles

We have a strong team of experienced Teachers who are here to solve all your exam preparation doubts

Mp board solution and extra question answers of class 7 social science chapter 1 – भारत और विश्व, rs aggarwal class 8 chapter 5 assertion reason playing with numbers solutions, seba board solution class 10 history chapter 1 partition of bengal (1905-1911 a.d.) and swadeshi movement, seba board solution class 10 history chapter 2 rise of gandhi and the freedom movement of india.

Username or Email Address

Remember Me

Class 9 Science Case Study Questions Chapter 1 Matter in our Surroundings

Post author: studyrate
Post published:
Post category: class 9th
Post comments: 0 Comments

Case study Questions in Class 9 Science Chapter 1 are very important to solve for your exam. Class 9 Science Chapter 1 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving Class 9 Science Case Study Questions Chapter 1 Matter in our Surroundings

Join our Telegram Channel, there you will get various e-books for CBSE 2024 Boards exams for Class 9th, 10th, 11th, and 12th.

In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Matter in our Surroundings Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 9 Science Chapter 1 Matter in our Surroundings

Case Study/Passage-Based Questions

Case Study 1: There are three states of matter – solid, liquid, and gas.

Solids have a definite shape, distinct boundaries, and fixed volumes, that is, have negligible compressibility. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid.

Liquids have no fixed shape but have a fixed volume. They take up the shape of the container in which they are kept. Liquids flow and change shape, so they are not rigid but can be called fluid.

Gas has an indefinite shape and no fixed volume. Gas gets the shape and volume of the container.Gas has a very low density and hence is light. Gas can flow easily and hence is called fluid.

i.) Which of the following state of matter takes the shape of the container in which it is filled?

d.) Both b and c

Answer: d.) Both b and c

ii.) Distance between particles of matter least in

d.) None of these

Answer: a.) Solid

iii.) Compressibility is least in case of

Case Study 2: Matter is anything that occupies space and has mass. It exists in various forms, such as solid, liquid, and gas. The physical properties of matter, such as shape, size, and state, can be observed and measured. The particles that makeup matter are constantly in motion, and their motion determines the state of matter. In a solid, the particles are tightly packed and have a fixed shape and volume. In a liquid, the particles are close together but can move past each other, giving the substance a fixed volume but no fixed shape. In a gas, the particles are far apart and move freely, allowing the substance to occupy any volume and shape. Matter can undergo changes in its state through the processes of evaporation, condensation, melting, and freezing. Understanding the properties and behavior of matter is essential for studying various scientific phenomena and practical applications in our daily lives.

What is matter? a) Anything that occupies space and has mass b) Anything that is visible to the naked eye c) Anything that is in a solid state d) Anything that is in a gaseous state Answer: a) Anything that occupies space and has mass

What determines the state of matter? a) Physical properties b) Chemical properties c) The motion of particles d) The color of the substance Answer: c) The motion of particles

How are particles arranged in a solid? a) Far apart and move freely b) Close together but can move past each other c) Tightly packed and have a fixed shape d) Tightly packed but have no fixed shape Answer: c) Tightly packed and have a fixed shape

What is the behavior of particles in a gas? a) They are far apart and move freely b) They are close together but can move past each other c) They are tightly packed and have a fixed shape d) They are tightly packed but have no fixed shape Answer: a) They are far apart and move freely

What processes can matter undergo to change its state? a) Evaporation, condensation, melting, and freezing b) Dissolution, combustion, sublimation, and oxidation c) Fermentation, photosynthesis, respiration, and digestion d) Oxidation, reduction, precipitation, and ionization Answer: a) Evaporation, condensation, melting, and freezing

Hope the information shed above regarding Case Study and Passage Based Questions for Class 9 Science Chapter 1 Matter in our Surroundings with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 9 Science Matter in our Surroundings Case Study and Passage Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible By Team Study Rate

Mcq questions of class 9 social science history chapter 7 history and sport the story of cricket with answers, mcq questions of class 9 social science geography chapter 4 climate with answers, class 9 science case study questions chapter 10 gravitation, leave a reply cancel reply.

Save my name, email, and website in this browser for the next time I comment.

CBSE Expert

Case Study Questions of Chapter 1 Matter in our Surroundings PDF Download

Case study Questions on Class 9 Science Chapter 1 are very important to solve for your exam. Class 9 Science Chapter 1 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 9 Science Chapter 1 Matter in our Surroundings

Matter in our Surroundings Case Study Questions With answers

Here, we have provided case-based/passage-based questions for Class 9 Science Chapter 1 Matter in our Surroundings

Case Study/Passage-Based Questions

Question 1:

There are three states of matter – solid, liquid, and gas.

Liquids have no fixed shape but have a fixed volume. They take up the shape of the container in which they are kept. Liquids flow and change shape, so they are not rigid but can be called fluid.

Gas has an indefinite shape and no fixed volume. Gas gets the shape and volume of the container.

Gas has very low density hence is light. Gas can flow easily and hence is called fluid.

i.) Which of the following state of matter takes shape of the container in which it is filled?

d.) Both b and c

Answer: d.) Both b and c

ii.) Distance between particles of matter least in

d.) None of these

Answer: a.) Solid

iii.) Compressibility is least in case of

Download India's best Exam Preparation App Now.

Key Features

Revision Notes
Important Questions
Previous Years Questions
Case-Based Questions
Assertion and Reason Questions

No thanks, I’m not interested!

NCERT Solutions for Class 9 Chemistry Chapter 1 Free PDF Download

Ncert solutions for class 9 chemistry chapter 1 – matter in our surroundings.

This article is about NCERT Solutions for Class 9 Chemistry Chapter 1. First of all, Chemistry is a branch of science that involves the study of matter. It has a lot of chemical formulas and other difficult concepts. Hence, it can be a hard subject for many students. Fortunately, NCERT Solutions solves this problem. The preparation of NCERT Solutions is from teachers who are experts in Chemistry. These solutions certainly help in making Chemistry concepts simple. Furthermore, students find it easy to memorize chemical formulas with their help.

Is there anything that can make NCERT Solutions even more beneficial? The answer is Toppr. This is certainly a fine platform that has plenty of videos. The content of Toppr is very reliable. Furthermore, the content is such that it arouses the curiosity of students.

Toppr provides free study materials, the last 10 years of question papers, 1000+ hours of video lectures. Download the Toppr app for Android or iOS or signup for free.

Download NCERT Solutions for Class 9 Chemistry Chapterwise here.

Download NCERT Solutions for Class 9 here.

Download NCERT Solutions for all subjects here.

CBSE Class 9 Chemistry Chapter 1 – Matter in Our Surroundings NCERT Solutions

NCERT Solutions for Class 9 Chemistry Chapter 1 deals with Matter in Our Surroundings. First of all, everything in this universe is made up material which scientist call matter. Above all, the matter is anything that occupies space and has mass. Therefore, matter includes air, food, stones, animals, stars, planets, etc. Consequently, matter exists all over our surroundings. This chapter certainly shows the importance of the matter. It explains the physical properties and chemical nature of nature. Furthermore, the chapter gives information about the particles of matters.

case study questions class 9 chemistry chapter 1

Sub-topics covered under NCERT Solutions for Class 9 Chemistry Chapter 1

1.1 Physical Nature of Matter
1.2 Characteristics of Particles of Matter
1.3 States of Matter
1.4 Can Matter Change its State?
1.5 Evaporation

NCERT Solutions for Class 9 Chemistry Chapter 1

First of all, this chapter is extremely important in Chemistry. There is almost no part of Chemistry where the matter is not discussed. Furthermore, understanding this chapter will strengthen the whole chemistry of the student. This chapter has huge applications in physics, engineering, biology, astronomy, etc. Also, the properties of matter are important in every field of science. Besides science, the matter is certainly important in geography and geology. Finally, this is an essential topic of general knowledge.

Below is a brief explanation of the sub-units of chapter 1:

1.1 Physical Nature of Matter- This part discusses the physical nature of matter. This chapter also discusses:

Matter is made up of particles
How small are these particles of matter

1.2 Characteristics of Particles of Matter – This part certainly discusses characteristics of matter particles. Below are minor topics

Particles of matter have space between them
The particles of matter are continuously moving
Particles of matter attract each other

1.3 Characteristics of Particles of Matter – There are certainly three states of matter. The minor topics are below:

The solid-state
The Liquid state
The gaseous state

1.4 Can Matter Change its State?- Matter can certainly change its state. The minor topics are below:

Effect of change of temperature
Effect of change of pressure

1.5 Evaporation – This means a change of a liquid into the gas phase. The minor topics are:

Factors affecting evaporation
How does evaporation cause cooling

You can download NCERT Solutions for Class 9 Chemistry Chapter 1 PDF by clicking on the download button below

Download Toppr – Best Learning App for Class 5 to 12

Toppr is the best education app for Class 5 to 12. It comes with some unique features of its own. Below are some important 5 features of Toppr.

The app is user-friendly and offers easy search
The platform is adaptable
Teachers with adequate experience and skills provide content
It has comprehensive online classes
The content’s reliability and authenticity is always 100%

Solved Questions For You:

Question 1. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

Answer: The diver is able to cut through water in a swimming pool. This observation shows that the matter has spaces between them so that the particles can move from one place to another to accommodate the body of the diver.

Question 2. Give reasons for the following observation:

Answer: Particles of hot food have more kinetic energy than the particles of cold food. Due to more energy, they can travel easily or diffuse through the air very fast and can be reached several meters away.

Question 3. Which of the following is(are) matter?

Answer: The matter is something that has weight and occupies space. So according to the definition,

Question 4. What are the characteristics of the particles of matter?

The particles of matter have spaces between them
The particles of matter attract each other
The particles of matter are very, very small.

Customize your course in 30 seconds

Which class are you in.

NCERT Solutions for Class 9

NCERT Solutions for Class 9 History Chapter 3 Free PDF Download
NCERT Solutions for Class 9 History Chapter 6 Free PDF Download
NCERT Solutions for Class 9 Maths Chapter 15 Free PDF Download
NCERT Solutions for Class 9 Maths Chapter 7 Free PDF Download
NCERT Solutions for Class 9 Maths Chapter 14 Free PDF Download
NCERT Solutions for Class 9 Maths Chapter 12 Free PDF Download
NCERT Solutions for Class 9 Maths Chapter 1 Free PDF Download
NCERT Solutions for Class 9 Maths Chapter 9 Free PDF Download
NCERT Solutions for Class 9 Maths Chapter 4 Free PDF Download
NCERT Solutions for Class 9 Maths Chapter 11 Free PDF Download

Download the App

Gurukul of Excellence

Classes for Physics, Chemistry and Mathematics by IITians

Join our Telegram Channel for Free PDF Download

Case Study Questions for Class 9 Science Chapter 1 Matter in Our Surroundings

Last modified on: 1 month ago
Reading Time: 6 Minutes

Here we are providing case study questions for class 9 science chapter 12 sound. Students are suggested to go through each and every case study questions for better understanding of the chapter.

Case Study/Passage Based Questions:

Question 1:

Read the following passage and answer the questions given below.

Every matter is made up of tiny particles. These particles are so tiny that they can’t be seen with naked eyes.

The three characteristics shown by particles of matter are as follows:

(i) There are small voids between particles in a matter. This characteristic is the concept behind the solubility of a substance in other substances.

(ii) Particles of matter show continuous random movements, that is they possess kinetic energy. The spreading of ink in a beaker of glass, smell of agarbattis, etc. are few illustrations that show the movement of particles of a substance.

(iii) The particles of matter attract each other with a force called interparticle force of attraction. Read the given passage carefully and give the answer of the following questions:

Q 1. Spreading of fragrance of a burning incense stick in a room shows that:

a. particles of matter have spaces between them.

b. particles of matter attract each other.

c. particles of matter are constantly moving.

d. None of the above

Q 2. What happens when we add sugar to water?

a. Volume of water doubles.

b. Volume of water decreases

c. Volume of water remains the same.

Q 3. A stream of water cannot be cut by fingers. Which property of matter does this observation show?

a. Particles of matter attract each other.

b. Particles of matter have spaces between them.

c. Particles of matter are continuously moving.

Q 4. When we put some crystals of potassium permanganate in a beaker containing water, we observe that after some time, the whole water turns pink. This intermixing of particles of two different types of matter on their own is called:

a. Brownian motion

c. sublimation

d. diffusion

Q 5. Why is the rate of diffusion of liquids higher than that of solids?

a. In the liquid state, particles are tightly packed as compared to solids.

b. In the liquid state, particles move freely as compared to solids.

c. In solid state, particles have least force of attraction between the particles.

d. In solid state, particles cannot be compressed easily.

(c) particles of matter are constantly moving.
(c) Volume of water remains the same.
(a) Particles of matter attract each other.
(d) diffusion
(b) In the liquid state, particles move freely as compared to solids

Download cbse books.

Exam Special Series:

Sample Question Paper for CBSE Class 10 Science (for 2024)
Sample Question Paper for CBSE Class 10 Maths (for 2024)
CBSE Most Repeated Questions for Class 10 Science Board Exams
CBSE Important Diagram Based Questions Class 10 Physics Board Exams
CBSE Important Numericals Class 10 Physics Board Exams
CBSE Practical Based Questions for Class 10 Science Board Exams
CBSE Important “Differentiate Between” Based Questions Class 10 Social Science
Sample Question Papers for CBSE Class 12 Physics (for 2024)
Sample Question Papers for CBSE Class 12 Chemistry (for 2024)
Sample Question Papers for CBSE Class 12 Maths (for 2024)
Sample Question Papers for CBSE Class 12 Biology (for 2024)
CBSE Important Diagrams & Graphs Asked in Board Exams Class 12 Physics
Master Organic Conversions CBSE Class 12 Chemistry Board Exams
CBSE Important Numericals Class 12 Physics Board Exams
CBSE Important Definitions Class 12 Physics Board Exams
CBSE Important Laws & Principles Class 12 Physics Board Exams
10 Years CBSE Class 12 Chemistry Previous Year-Wise Solved Papers (2023-2024)
10 Years CBSE Class 12 Physics Previous Year-Wise Solved Papers (2023-2024)
10 Years CBSE Class 12 Maths Previous Year-Wise Solved Papers (2023-2024)
10 Years CBSE Class 12 Biology Previous Year-Wise Solved Papers (2023-2024)
ICSE Important Numericals Class 10 Physics BOARD Exams (215 Numericals)
ICSE Important Figure Based Questions Class 10 Physics BOARD Exams (230 Questions)
ICSE Mole Concept and Stoichiometry Numericals Class 10 Chemistry (65 Numericals)
ICSE Reasoning Based Questions Class 10 Chemistry BOARD Exams (150 Qs)
ICSE Important Functions and Locations Based Questions Class 10 Biology
ICSE Reasoning Based Questions Class 10 Biology BOARD Exams (100 Qs)

✨ Join our Online JEE Test Series for 499/- Only (Web + App) for 1 Year

✨ Join our Online NEET Test Series for 499/- Only for 1 Year

Discover more from Gurukul of Excellence

Subscribe now to keep reading and get access to the full archive.

Type your email…

Talk to our experts

1800-120-456-456

NCERT Solutions for Class 9 Science Chapter 1 - Matters In Our Surroundings
NCERT Solutions

NCERT Solutions for Class 9 Science Chapter 1 - Matter in Our Surroundings

The NCERT Answer for Class 9 Science Chapter 1 was written with the sole purpose of assisting students in obtaining more marks and improving their grades in mind. The answer for class 9 Science chapter 1 addresses students' academic expectations and needs. The themes in Chapter 1 on Matter in Our Surroundings are covered in accordance with the CBSE syllabus . The solution's strategy incorporates a step-by-step method that assists in improved knowledge of the issues.

NCERT Solution of class 9 Science chapter 1 has been created, keeping in mind the primary goal of helping students to secure more marks and improve grades. The academic requirements and needs of students have been addressed in the solution for class 9 Science chapter 1. The topics in chapter 1 related to Matter in Our Surrounding are discussed according to the CBSE syllabus. The approach in the solution involves a step-by-step process which aids in better comprehension of the topics.

CBSE class 9 Science chapter 1 solutions explain all the foundational concepts in detail for students to understand better. The solutions are made available to everybody over the Vedantu app. These free PDFs can be downloaded easily from Vedantu’s official portal.

You can also download NCERT Solutions for Class 9 Maths and NCERT Solution for Class 9 Science to help you to revise complete syllabus and score more marks in your examinations.

Access NCERT solutions for Class 9 Science Chapter – 1 Matter in our Surroundings

Intext exercise -1.

1. Which of the following are the matter?

Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume.

Ans: Matter is anything that occupies space and has some mass. There are three states of matter called Solid, Liquid and Gas. On the basis of these three states, we can define that which of this is a matter:

Chair and almond are said to be in a solid state of matter as these have fixed shape., cold drink is in liquid state as it has the tendency to flow., air and the smell of perfume have gaseous particles which are free to move so this will also be considered as a gaseous state of matter..

While Love, hate, cold, smell and thought are not having any mass or neither do they occupy space these are just emotions or sensations felt by human beings so they are not considered as matter.

2. Give reasons for the following observation:

The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.

Ans: The smell of hot sizzling food prepared by our mom reaches to us in our room from kitchen but if the food gets cold after some time, we did not feel any smell of that food this phenomenon can be defined on the basis of rate of diffusion which gets increases when the temperature get increases as high temperature increases the kinetic energy of food particles to get diffused in air. The temperature of hot food particles is high as compared to old one so its molecules get easily diffused in the air as compared to cold ones.

3: a diver is able to cut through water in a swimming pool. which property of matter does this observation show, ans: this can be explained on the properties of matter to attract the particles towards themselves and this will also decide their shape and rigidity. the force of attraction is highest in case of solid as compared to liquid and gas this defines that particles of solid are tightly bound to each other. while in case of liquid particles they have less forces of attraction which defines that there is space between the particles and due to this reason that we can cut them easily. that is why we can say that due to less forces of attraction between water molecules a diver is able to cut through water in a swimming pool., 4: what are the characteristics of particles of matter, ans: matter is anything that occupies space and has some mass. there are three states of matter called solid, liquid and gas., the main characteristics of matter can be described as follows:, particles of matter have space between them and the order of spacing is highest in gas after that liquid and solid have very less space between their particles., particles of matter are continuously moving in all the three states of matter., particles of matter attract each other with strong forces which help them to bind with each other. in solid particles attraction is very high whereas in liquid it is low and in gases it is quite low. , intext exercise -2.

1: The mass per unit volume of a substance is called density (density = mass/volume). Arrange the following in order of increasing density − air, exhaust from chimney, honey, water, chalk, cotton, and iron.

Ans: Density is depending on mass and volume hence higher the mass higher will be the density and out of these heavier particles have higher mass as compare to lighter one so the order of increasing density of given substances can be written as follows:

Air < Exhaust from chimney < Cotton < Water < Honey < Chalk < Iron.

Tabulate the differences in the characteristics of states of matter.

Matter is anything that occupies space and has some mass. There are three states of matter called Solid, Liquid and Gas.

Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy, and density.

Ans:

Rigidity: it is defined as the tendency of matter to resist a change in shape..

Compressibility: The ability of matter to reduce in volume when any type of external force is applied on it.

Fluidity: Tendency of particles to flow this property can be seen in case of liquid and gases which can also be known as fluids.

Filling a Gas Container: Gases neither have definite shape nor have definite volume. Gases take the shape of that container in which it gets filled. Hence by filling a gas container, it means the attainment of shape of the container by the gas.

Shape: Shape corresponds to fixed volume and boundary. Only solids have a fixed shape.

Kinetic Energy: Particles which produce energy possessed due to its continuous motion.

Density: It is defined as the mass per unit volume.

3: Give Reasons:

A Gas Fills Completely the Vessel in Which it is Kept.

The gas particles have a tendency to move freely in all directions as they have very less force of attraction between their particles. Like water, gas can also take the shape of the container in which it is kept. Therefore, we can say that gas completely fills the vessel in which it is kept.

A Gas Exerts Pressure on the Walls of the Container.

The gas particles move freely due to its lesser forces of attraction between the particles. Therefore, these gaseous particles continuously collide with each other and with the walls of the container with a greater force. Pressure is known as the force produced by the gas particles per unit area. By this we can say that gas exerts pressure on the walls of the container.

A wooden table should be called a solid.

A wooden table is very rigid in nature which means that it has a definite shape and its shape cannot be changed easily and has definite volume too. The shape is fixed due to strong intermolecular forces hence it attains all the properties of solid therefore, it is considered as a solid.

We can easily move our hands in air, but to do the same through a solid block of wood, we need a karate expert.

Air particles have very less forces of attraction between their particles so they have large space in between them. But wood has very little space between the particles due to its high force of attraction therefore, wood is considered to be of rigid nature. Due to this reason, we can easily move our hands in air but the same will not happen through a solid block of wood. For this we need a karate expert.

4: Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.

Ans: as we know that density is defined as the mass per unit volume. this corresponds with the increase of the volume of any substance density will decrease as they are inversely proportional to each other. .

Ice is solid in nature therefore it contains strong intermolecular forces which tightly bound them and they contain lesser volume but on the other hand liquid has tendency to move freely due to weak intermolecular forces and contain large volume.

From this we can say that water has larger volume and lesser density so it has a tendency to float on water.

Intext Exercise -3

1: convert the following temperature to celsius scale:.

Celsius and Kelvin are two main scales to measure the temperature. By subtracting the 273K from the given value we can get the value in degrees Celsius. The formula corresponds to degree Celsius can be shown as:

\[X{}^\circ C=(X-273)\]

\[300K=(300-273){}^\circ C=27{}^\circ C\]

573 K

$573K=(573-273){}^\circ C=300{}^\circ C$

2: What is the physical state of water at:

$\mathbf{\text{25}{{\text{0}}^{\text{o}}}\text{C}}$

Ans: Physical state corresponds to the state of matter whether it exists in solid, liquid or gas.

$\text{25}{{\text{0}}^{\text{o}}}\text{C}$– As we know that water starts boiling at 100°C and above this temperature water exists in gaseous state. So, this defines that water at 250°C exists in a gaseous state.

$\mathbf{{{100}^{o}}C}$

${{100}^{o}}C$ – It is the starting point where water starts boiling so at this temperature water exists in both liquid and gaseous states.

3: For any substance, why does the temperature remain constant during the change of state?

Ans: this can be explained as the whole heat which we are providing to the substance to increase its temperature is used to break the intermolecular forces of attraction between them. this heat will also correspond to the latent heat i.e., the heat which gets absorbed or released during change of state. hence all the energy gets used so temperature remains constant. , 4: suggest a method to liquefy atmospheric gases., ans: atmospheric gases can be defined as the gases present in the atmosphere. it can be liquified i.e., converted into liquid by applying suitable conditions of applying pressure and by reducing their temperature., intext exercise -4, 1: why does a desert cooler cool better on a hot dry day, ans: this can be explained by the process called evaporation, this is the process in which the liquid particles absorb energy from the surroundings and cause cooling. the rate of evaporation generally depends on the amount of water vapour present in the air. if the amount of water vapor present in air is more than the rate of evaporation is more or vice-versa. on a hot dry day, the amount of water vapor present in air is quite low so this will evaporate easily and make its surroundings cooler. thus, from this we can say that a desert cooler cools better on a hot dry day as compared to rainy one., 2: how does water kept in an earthen pot (matka) become cool during summers, ans: an earthen pot or matka is generally made up of sand particles in which many tiny pores exist and this helps the water inside the pot to evaporate and surroundings makes the water cool. this is the reason why people kept the water in an earthen pot during summers., 3: why does our palm feel cold when we put some acetone or petrol or perfume on it, ans: acetone, petrol or perfume are considered as organic compounds which are volatile in nature whereas volatile substances are those which easily get vaporized and go through the process of evaporation. we know that during the process of evaporation particles of these organic liquids absorb energy from the surroundings or the surface of the palm and make the surroundings or surface of the palm somewhat cool. this is the reason why our palm feels cold when we put some acetone, petrol or perfume on it. , 4: why are we able to sip hot tea or milk faster from a saucer than a cup, ans: this can also be explained on the basis of rate of evaporation as we know that evaporation produces a cooling effect and evaporation depends on the surface area, larger the surface area higher the evaporation. as in saucer the area is larger as compared to cup so evaporation will be high in case of greater surface area. thus, we can say that liquid cools faster in a saucer than in a cup and due to this reason, we are able to sip hot tea or milk faster from a saucer than a cup., 5: what type of clothes should we wear in the summer, ans: in summer we usually sweat so we have to wear cotton or light-colored clothes because cotton or light-colored clothes can absorb more sweat from our body and transfers the sweat which is in the form of liquid to the atmosphere and makes the evaporation process faster. evaporation process causes a cooling effect which makes our body cool in cotton clothes as compared to synthetic or woolen ones. , ncert exercise, 2: convert the following temperature to kelvin scale:.

$\mathbf{25{}^\circ C}$

Celsius and Kelvin are two main scales to measure the temperature. By adding the 273K from the given value we can get the value in degrees Celsius. The formula corresponds to degree Celsius can be shown as:

\[0{}^\circ C=273K\]

\[{{27}^{o}}C=(27+273)K=300K\]

$\mathbf{373{}^\circ C}$

${{373}^{o}}C=(373+273)K=646K$

3: Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

This phenomenon can be explained on the basis of sublimation which defines that solid is directly converted into gaseous form without turning it into liquid. naphthalene is one that substances which undergo through the process of sublimation easily at room temperature. that is why we can say that naphthalene balls disappear after some time without leaving any solid., we can get the smell of perfume sitting several meters away., gaseous particles have very less internuclear forces due to which its molecules are very free to move and it possesses high kinetic energy. due to this reason particles of perfumes diffuse into the atmosphere and its molecules will mix in the environment which enables us to smell the perfume from several meters away., 4: arrange the following substances in increasing order of forces of attraction between particles − water, sugar, oxygen., ans: forces of attraction is the attracting power of molecules which keep them together and intermolecular forces are very strong in case of solid as compared to liquid or gas. , here sugar is said to be solid and contains higher forces of attraction., water is liquid comparatively containing lesser forces of attraction but higher as compared to gases., oxygen is a gas which contains very less attraction between forces., thus, the increasing order of forces of attraction between the particles of water, sugar and oxygen is.

Oxygen < Water < Sugar

5: What is the physical state of water at:

$\mathbf{{{25}^{o}}C}$

Ans: Physical state corresponds to the state of matter whether it exists in solid, liquid or gas.

$25{}^\circ C$– As we know that water melts at 0°C and above this temperature water exists in liquid state. So, this defines that water at 25°C exists in a liquid state

$\mathbf{{{0}^{o}}C}$

Ans: $0{}^\circ C$– It is the temperature at which water starts melting i.e., water gets converted into liquid from ice so at this temperature water exists as both solid and liquid state.

Ans: $100{}^\circ C$– It is the starting point where water starts boiling so at this temperature water exists in both liquid and gaseous states.

6: Give two reasons to justify:

water at room temperature is a liquid.

We find water is in liquid state at room temperature this can be justified as follows:

Water does not have any fixed shape; it can take the shape of the container in which it is kept and water has definite volume.

It has a tendency to flow.

Have weak intermolecular forces between their particles.

These all describe the property of liquid so we can say that water is liquid at room temperature.

An Iron Almirah is a Solid at Room Temperature.

Iron almirah kept in our room is said to be solid due to following reasons:

It has a fixed shape and definite volume.

It contains strong intermolecular forces between their particles.

Rigid in nature, difficult to compress.

These all describe the property of solid so we can say that almirah is solid at room temperature.

7: Why is ice at 273 K more effective in cooling than water at the same temperature?

Ans: here condition given that both ice and water are at same temperature i.e. 273 k. but ice at 273 k has less energy as compared to water this can be explained on the basis of latent heat of fusion which is possessed by water as an additional energy but ice does not have such type of energy. therefore, we can say that at 273 k ice is more effective in cooling as compared to water., 8: what produces more severe burns, boiling water or steam, ans: steam and water both are said to be at the same temperature i.e., 373 k. but steam contains more energy as compared to boiling water. this can be explained on the basis of latent heat of fusion which is possessed by water as an additional energy. therefore, steam produces more severe burns than boiling water., 9: name a, b, c, d, e and f in the following diagram showing change in its state..

A is the process of converting solid into liquid is called Melting.

B is the process which converts liquid into gaseous state, this is called vaporisation.

C in which gases get converted into liquid this is called condensation.

D is the process which converts liquid into solid. It is called solidification.

E and F are the processes which convert solid into gas or vice versa is known as sublimation.

You can opt for Chapter 1 - Matter in Our Surroundings NCERT Solutions for Class 9 Science PDF for Upcoming Exams and also You can Find the Solutions of All the Maths Chapters below.

NCERT Solutions for Class 9 Science

Chapter 1 - Matter in Our Surroundings

Chapter 2 - Is Matter Around us Pure

Chapter 3 - Atoms and Molecules

Chapter 4 - Structure of Atom

Chapter 5 - The Fundamental Unit of Life

Chapter 6 - Tissues

Chapter 7 - Diversity in Living Organisms

Chapter 8 - Motion

Chapter 9 - Force and Laws of Motion

Chapter 10 - Gravitation

Chapter 11 - Work and Energy

Chapter 12 - Sound

Chapter 13 - Why do We Fall ill

Chapter 14 - Natural Resources

Chapter 15 - Improvement in Food Resources

Important Concepts Covered in Chapter 1 - Matter in Our Surroundings of Class 9 Science NCERT Solutions

The first chapter delves into the meaning of the matter, its definition, and the various physical states of matter. The matter is defined as everything that takes up space and has mass. For example, water and sugar, sand and sugar, hydrogen and oxygen, and so forth. The matter is made up of minuscule, microscopic particles. Because matter particles have space between them, they are attracted to one another.

Matter in Our Surrounding is the first chapter of Class 9 Science and it covers the following concepts.

Class 9 Science Chapter 1 Matter in Our Surroundings

Even though the topic of Matter in Our Surroundings can be very wide in scope, NCERT solution of Class 9 Science Chapter 1 strictly adheres to the CBSE syllabus. Here are the topics covered –

Matter in Our Surroundings

The introductory chapter elucidates the concept of matter, its definition and the and the physical states in which it exists in nature.

Physical State of Matter

The three physical states of matter are discussed – solid, liquid and gas. The point is elaborated with instances, one of which exemplifies the property of matter when a diver cuts through water.

Characteristics of Particles of Matter

In this chapter, students get to know various characteristics of particles of matter. It discusses that particles of matter – (1) have intermolecular spaces, (2) are in continuous motion and (3) experiences force between one another.

States of Matter

Chapter 4 deals with the features of states of matter – compressibility, rigidity, fluidity, kinetic energy, shape and density.

Can Matter Change its State?

The occurrence of change in state of matter is discussed through the example of ice converting into water and eventually into gaseous form.

Evaporation

The concept of evaporation is exemplified through the question as to why a desert cooler functions better on a hot, dry day as opposed to other weather conditions.

Why is it Beneficial for Students to Study from NCERT solutions class 9 Science Matter in Our Surroundings?

Teachers and mentors have always stressed on the importance of self-study in order for a student to succeed. The material that is referred to in the course of self-study also holds a critical value. Here are some of the benefits of studying NCERT solution of Class 9 Science Chapter 1 that would provide students with that much-needed competitive edge –

The solutions are framed by domain experts possessing much experience. The language of the material has been purposely kept lucid; however, the content remains comprehensive. It enables students to gain in-depth knowledge on the topic

If there is any concern about the relevance and accuracy of the Class 9 Science Ch 1 NCERT solutions, it can be put to rest. The solution strictly adheres to the CBSE curriculum, without any scope for deviation

It is ensured that the basic concepts are suitably explained so that students remain clear on the topic

Ample problem exercises are provided so that students get sufficient practice

The NCERT Solutions for Matter in Our Surroundings (Chapter 8) for Class 9 are given in this article.

Conclusion

This solution contains all of the chapter's questions so that students may prepare for their examinations properly. We have also provided NCERT activities to help pupils grasp the kind or pattern of questions in the CBSE Class 9 test.

While your devotion and constant practice will put you on the right track, NCERT answers will only pave the road. Therefore, get the answer right now and get started on your preparation!

FAQs on NCERT Solutions for Class 9 Science Chapter 1 - Matters In Our Surroundings

1. What are the different characteristics of state of matter explained in NCERT solutions class 9 Science chapter 1?

The different characteristics as elaborated in CBSE Class 9 Science Chapter 1 solutions are based on six parameters - (1) Shape, (2) Volume, (3) Rigidity or Fluidity, (4) Intermolecular force, (5) Intermolecular space, and (6) Compressibility.

A few of the properties listed in Matter in Our Surroundings Class 9 NCERT answers suggest that solids have a set form, volume, and are rigid, whereas liquids have no fixed shape or volume and are less rigid than solids. Gas, on the other hand, has no definite shape or volume and is not hard.

2. Which are the chapters included in Class 9 Science as per the NCERT Science Book?

There are altogether fifteen chapters included in CBSE class 9 Science – (1) Matter in Our Surroundings, (2) Is Matter Around Us Pure, (3) Atoms and Molecules, (4) Structure of Atom, (5) The Fundamental Unit of Life, (6) Tissues, (7) Diversity in Living Organisms, (8) Motion, (9) Force and Laws of Motion, (10) Gravitation, (11) Work and Energy, (12) Sound, (13) Why do We Fall Ill, (14) Natural Resources, (15) Improvement in Food Resources.

3. Can NCERT Solutions be an effective way to prepare Science Class 9 Chapter 1?

Yes, NCERT Solutions will help the studnets to prepare for chapter 1 of Class 9 pretty well. While there can be a multitude of ways to prepare Ch 1 Class 9 Science, it is only when such preparation is done in a systematic manner, can an optimal output be gained. It is advised that instead of starting with a topic in Class 9 Chapter 1 solution of one’s preference, proceed according to the flow of the chapter.

4. How many questions are present in each exercise of NCERT Solutions for Class 9 Science Chapter 1?

There are five exercises in the NCERT Solutions for Class 9 Science Chapter 1. In Exercise 1, there are four questions. In Exercise 2, there are four questions. Exercise 3 also consists of four questions. In Exercise 4, there are four questions. Lastly, the NCERT exercise has nine questions. All of these questions are provided along with their solutions in the NCERT Solutions for Class 9 Science Chapter 1.

5. Are the NCERT Solutions for Class 9 Science Chapter 1 sufficient for the exam preparation?

Yes. To do well in the test, students must study and prepare through self-study in addition to what is given in school. Students must use the best study resources provided on Vedantu for self-study. Students should refer to NCERT Answers for Class 9 Science Chapter 1 and others when studying for the Class 9 Science test. They are developed by qualified teachers and are simple to grasp.

6. What is the matter in our surroundings?

Matter in our surroundings is the first topic covered in Chapter 1 of Class 9 Science. In this chapter, students learn what matter is and which entities can not be considered as matter. The five basic elements that constitute matters in our surroundings are fire, earth, sky, water and air. The building blocks of matter are very small particles that can only be seen under a microscope.

7. Write in short answer format what is matter according to the syllabus of Class 9.

Matter is defined as everything that fills space and has mass. Matter may be perceived by humans through their senses. Water, earth, fire, sky, and air are components that make up matter. It is made up of microscopic particles that can only be seen under a microscope. These are the fundamental building components of matter. Light, heat, electricity, and magnetism are not considered matter since they do not occupy space or have mass.

8. How to download the NCERT Solutions Class 9 Science Chapter 1?

Students can use NCERT Solutions for Class 9 Science Chapter 1 to download the NCERT Solutions Class 9 Science Chapter 1 from Vedantu (vedantu.com). These solutions contain the answers to all the questions from Chapter 1 of the Class 9 Science NCERT textbook in a concise and structured manner. These are available free of cost on Vedantu (vedantu.com). Students can download these using the Vedantu app as well. By going through the solutions, students can learn how to write their answers in the exam. Apart from the solutions, students can also find other study material on Vedantu, including important questions, revision notes and previous year question papers.

NCERT Solutions for Class 9

Extra Questions for Class 9th: Ch 1 Matter in Our Surrounding Science

Extra questions for class 9th: ch 1 matter in our surrounding (science) important questions answer included, contact form.

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings

Extra questions for Class 9 Science Chapter 1 Matter in Our Surroundings with answers is given below. Our subject expert prepared these solutions as per the latest NCERT textbook. These questions will be helpful to revise the all topics and concepts. CBSE Class 9 extra questions are the most simple and conceptual questions that are prepared by subject experts for the students to study well for the final exams. By solving these extra questions, students can be very efficient in their exam preparations.

Matter in Our Surroundings Class 9 Science Extra Questions and Answers

Very short answer questions.

1. Define matter. Answer: Anything that occupies space and has mass is called matter.

2. State different states of matter with an example. Answer: Matter has 3 different states (i) Solid (ii) liquid (iii) gas

3. What is diffusion? Answer: The intermingling of molecules of one substance with that of the other is called diffusion.

4. What happen to the rate of diffusion if the temperature is increased? Answer: With increased temperature, the rate of diffusion also increases as the particles gain energy and vibrate more.

5. Name the state of matter that have the tendency to maintain their shape when subjected to outside force. Answer: Solid.

6. Define melting point. Answer: The temperature at which a solid melts to become liquid at the atmospheric pressure is called its melting point.

7. Define boiling point. Answer: The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point.

8. Define latent heat of vaporization. Answer: Latent heat of vaporization is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point.

9. Define latent heat of fusion. Answer: Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point.

10. Define sublimation. Answer: Sublimation is the change of gaseous state directly to solid state without going through liquid state and vice-versa.

11. What is dry ice? Answer: Solid carbon dioxide obtained by cooling and applying pressure on carbon dioxide gas. It does not melt so it is called dry ice.

12. What is humidity? Answer: The air holds water vapour, this air with water is called humid air and the phenomenon is called humidity.

13. Give two properties of solid. Answer: (1) Solids have fixed shape and are rigid. (2) Solids cannot be compressed.

14. What will happen if the pressure is reduced on solid carbon dioxide (dry ice)? Answer: If the pressure is reduced on solid carbon dioxide it will directly change into gaseous state without melting.

15. Name any three substances that show sublimation. Answer: Ammonium chloride, camphor and naphthalene balls.

16. Sponge is solid, but we can still compress it. Why? Answer: Sponge is a solid with minute pores in it. When we press the sponge the air present in these pores is released out and hence we are able to compress it.

17. What is normal atmospheric pressure? Answer: The atmospheric pressure at sea level is 1 atmosphere and taken as the normal atmospheric pressure.

18. What is Kelvin? Answer: Kelvin is the SI unit of temperature (0°C = 273 K).

19. Give two examples of diffusion. Answer: Milk drops dissolved in water and perfume sprayed in a room.

20. Give the temperature at which water exists in two different phases/states. Answer: At 0°C water can be in solid or in liquid state. At 100°C water can be in liquid or in gaseous state.

Short Answer Type Questions

1. Why do we see water droplets collected on the outer surface of a glass container, containing ice?

Answer: The water vapour present in air, comes in contact with the cold outer surface of the container thereby condensing it to form water droplets.

2. Explain why solids have fixed shape but liquids and gases do not have fixed shape.

Answer: Solids have fixed shape due to strong intermolecular force of attraction between them. The liquids and gases have molecules with less intermolecular force of attraction and hence they can flow and take shape of the container.

3. Liquids and gases can be compressed but it is difficult to compress solids. Why?

Answer: Liquids and gases have intermolecular space, on applying pressure externally on them the molecules can come closer thereby minimizing the space between them. But in case of solids there is no intermolecular space to do so.

4. A balloon when kept in sun, bursts after some time. Why?

Answer: The balloon has air filled in it. The balloon when kept in sun gets heated and the air inside it also gets heated. The molecules of air get energy, and vibrate faster thereby exerting large force on the walls of the balloon. Due to this expansion of gases the balloon bursts.

5. Why do people perspire a lot on a hot humid day?

Answer: On a hot, humid day, due to the heat our body starts sweating for the cooling mechanism i.e., by evaporation and gets cooling effect. But the air cannot hold any more water on a humid day and therefore the sweat or perspiration is seen.

6. Distinguish between evaporation and boiling. Answer:

7. Why is it advisable to use pressure cooker at higher altitudes?

Answer: At higher altitudes, the atmospheric pressure is low and the water boils very fast and evaporates at faster rate therefore the pressure is required to increase the cooking process and this is done by using pressure cooker which increases the pressure inside the container and cooks food faster.

8. What are fluids?

Answer: The states of matter that can flow due to less intermolecular force of attraction, are liquids and gases and are called as fluids.

9. One kg cotton and one kg sand, which is more denser? Why?

Answer: One kg sand is more denser than 1 kg cotton because density = mass/volume . The volume required by cotton is more than the sand and density and volume are inversely proportional.

10. Why is water liquid at room temperature?

Answer: At room temperature, the molecules of water have some intermolecular force of attraction and the room temperature cannot provide sufficient heat for these molecules to overcome their force of attraction and therefore remain in liquid phase.

11. State the differences between solid, liquid and gas. Answer:

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings 2

12. Cotton in solid but it floats on water. Why?

Answer: Cotton has large number of pores, in which air is trapped. Hence reducing its density and increasing the volume. Therefore cotton floats on water. But when these pores get filled with water it starts sinking.

13. Why arc solids generally denser than liquids and gases?

Answer: Density of a substance is given by a formula= Mass/Volume In case of solids the molecules are tightly packed and hence large mass is concentrated in very small volume. Hence their density is more. But in case of liquids and gases, their molecules have intermolecular space and hence they don’t have large mass concentrated in small volume. So the density of solids is generally more than that of the liquids and gases.

14. On a hot sunny day, why do people sprinkle water on the roof or open ground?

Answer: During hot sunny day, the surface of roof or ground absorbs large amount of heat and remains hot, on sprinkling water on these surfaces, the water absorbs large amount of heat from the surface due to its large latent heat of vaporisation thereby allowing the hot surface to cool.

15. On a hot sunny dug why do we feel pleasant sitting under a tree?

Answer: Tree has lot of leaves which constantly show transpiration. Transpiration is loss of water through small tiny pores of leaves called stomata. When this water comes on the surface of leaf the water evaporates thereby causing cooling effect. Therefore we feel pleasant sitting under the tree on a hot sunny day.

16. The temperature at which liquids change into vapours is very high, for example, water vaporises at 100°C then how is n possible for water to evaporate at room temperature or at are other temperature?

Answer: The molecules of water present on the surface of the exposed area which are in very small fraction, gains the energy from the surrounding. With this higher kinetic energy they are able to break the force of attraction between them and hence get converted into vapour state. This phenomenon of change of a liquid into vapours that takes place at any temperature below its boiling point is called evaporation.

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings 3

17. Name the factors that affect evaporation.

Answer: The rate of evaporation will increase with (1) an increase of surface area, (2) an increase of temperature, (3) a decrease in humidity, (4) an increase in wind speed.

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings 4

18. The melting point of ice is 273.16 K. What does this mean? Explain in detail.

Answer: Ice is solid at 0°C i.e., 273° K. The molecules of ice are tightly packed. These molecules have to overcome the force of attraction with which they are held and hence they gain this heat from the surrounding but the temperature remains the same as their energy is used to overcome the force of attraction between the particles. The particles have their state and starts vibrating freely and a stage reaches when the solid ice melts and is converted to liquid state at the same temperature i.e., 273 K.

19. How is the high compressibility property of gas useful to us?

Answer: The gases have high compressibility. This property is used in the following situation: (1) LPG (liquefied petroleum gas) is a fuel which is made up of petroleum gas. On compressing this petroleum gas it forms liquid. (2) Oxygen cylinders in the hospitals have compressed gas filled in it. (3) CNG (compressed natural gas) is a natural gas, methane, which is compressed and used as a fuel in vehicles and at home.

20. With the help of an example, explain how diffusion of gases in water is essential?

Answer: The gases from the atmosphere diffuse and dissolve in water. Gases like oxygen and carbon dioxide diffuse in water, are essential for the survival of aquatic animals and plants. Animals breathe in this oxygen dissolved in water for their survival and plants can use carbon dioxide dissolved in water for photosynthesis.

Long Answer Type Questions

1. Pressure and temperature determine the state of a substance. Ex-plane this in detail.

Answer: (i) Any matter i.e., solid, liquid or gas when experiences an increase in temperature then they change their state.

Take ice cubes in a beaker or heat them slowly, the temperature increases and the ice melts to form liquid. Heat this liquid further it will become steam.

(ii) On lowering down the temperature of any matter, show change in their state.

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings 6

Take the steam that is coming out of a boiling water and allow it to cool down, it condenses to form water and on further cooling of this water we get ice.

(iii) On applying pressure and reducing temperature we can liquefy gases or change them into solid.

Example: Take carbon-dioxide gas, reduce its temperature and apply lot of pressure on it so that it changes into solid carbon dioxide, called diy ice, which is used as refrigerant for cooling. If the pressure on it is decreased it directly changes into gas.

In LPG cylinders, the petroleum gas is cooled and with lot of pressure changes it into liquid state. While using this LPG, we release the pressure exerted on it and hence it comes out in the form of gas.

2. Explain giving examples the various factors on which rate of evaporation depends.

Answer: The rate of evaporation depends on the following factors: (1) Surface area: If the surface area is increased the rate of evaporation also increases. (a) To dry the clothes we spread them to dry faster. (b) Tea in saucer cools faster than in a cup. (2) Temperature: If the temperature is increased the rate of evaporation also increases. Due to increase in temperature the particles gain more kinetic energy and change their phase from liquid to gaseous. Water will evaporate faster in sun than in shade. (3) Humidity: It is the amount of water vapour present in air. The air can hold definite amount of water vapour, at a given temperature. If the amount of water vapour is high in the air then the rate of evaporation decreases. On hot and humid day, desert coolers are not effective as the air cannot hold any more moisture to get the cooling effect. (4) Wind speed: With the increase in wind speed, the rate of evaporation increases. The particles of water vapour move away with the wind, decreasing the amount of water vapour in the surrounding.

Value-Based Questions

1. Adil parked his bicycle on a sunny day in a parking stand of his school campus. When the school got over Adil saw his burst cycle type. Thereafter he kept less air in his cycle types and did not inflate them fully. (a) Why did the type burst? (b) Why is air compressible? (c) What value of Adil is reflected in the above act?

Answer: (a) The tyre burst because the air inside the tyre got heated and therefore exerted pressure on the walls of the tyre. (b) Air is compressible because it has large intermolecular space. (c) Adil showed the value of intelligence, awareness and self responsibility.

2. Akshay’s friend visited his house in Mumbai and he was surprised to see air conditioners installed in all of his rooms. His friend advised Akshay to use water-coolers and save electricity. On this Akshay told, him that the water-cooler is not at all effective in coastal areas. (a) Why are water-cooler not effective in coastal areas? (b) What are the other two factors on which evaporation of water depends? (c) What value of Akshay’s friend is seen in this act?

Answer: (a) Water coolers are not effective in coastal areas due to high rate of humidity. (b) The other two factors on which evaporation of water depends are temperature and surface area. (c) Akshay’s friend showed the value of concerned citizen, morally responsible and friendly in nature.

3. Sita lived in a village and could, not afford refrigerator in her house. She knew how to keep water cold and preserve all perishable items in her house. She kept wet cloth surrounding the earthen pot to keep water cool, she also kept vegetables fresh by keeping them in wet gunny bag and timely sprinkled water over it. (a) Why did Sita keep wet cloth surrounding the earthen pot? (b) Suggest one more method of keeping the house cool in summer. (c) What value of Sita is reflected in the above case?

Answer: (a) The wet cloth gave the cooling effect to the pot, as the water in the cloth evaporated and evaporation causes cooling effect. (b) By sprinkling some water on the lawn/veranda of the house can keep the house cool. (c) Sita showed the value of responsible behaviour.

4. Shreya commutes in a CNG fitted van to school every day along with many other students. She told the van driver to get the CNG connection certified and timely checked it for any leakage or loose connection of pipes. She told the driver to be more careful during summers. (a) What is CNG? (b) Why should one be more careful with CNG cylinders during summer? (c) What value of Shreya is seen in the above act?

Answer: (a) CNG is Compressed Natural Gas used as fuel. (b) During summers, the CNG connections and cylinder need to be checked because the gas expands due to heat and if there would be any leakage then it would cause fire in the vehicle. (c) Shreya showed the value of concerned citizen and morally responsible behaviour.

Textbook Solutions
Lakhmir Singh and Manjit Kaur Solutions
Lakhmir Singh Class 9
Class 9 Chemistry
Chapter 1 Matter in Our Surroundings

Lakhmir Singh Solutions Class 9 Chemistry Chapter 1 Matter In Our Surroundings

Lakhmir Singh Solutions for Class 9 Chemistry Chapter 1 Matter in Our Surroundings are provided in this article. Anything which occupies space and has mass is called matter. The matter is of different kinds. Air, water, ice, milk, and oil are some examples of matter in our surroundings. The matter is classified in a number of ways on the basis of its physical and chemical properties. Based on physical properties, the matter is classified into solid, liquid, and gas.

Solids are closely packed and have a definite shape.
Liquids have no definite shape or volume.
Gases have neither shape nor volume, and particles are farther apart.

Based on chemical properties, the matter is classified into elements, compounds, and mixtures. Everything around us is made up of tiny particles. For example, our body is made up of particles, and a small drop of rain even makes up matter. All the particles which make up matter are atoms and molecules, and they are in motion.

Lakhmir Singh Solutions for Class 9 Chemistry Chapter 1 Matter in Our Surroundings

carouselExampleControls111

lakhmir singh solutions class 9 chemistry chapter 1 01

Previous Next

Access Lakhmir Singh Solutions for Class 9 Chemistry Chapter 1 Matter in Our Surroundings

Very Short Answer Type Questions

Page no: 17

1. What are the conditions for ‘something’ to be called ‘matter’?

The condition for something to be called as the matter is that it should occupy space and have mass.

2. Name two processes which provide the best evidence for the motion of particles in matter.

Diffusion and Brownian motion are the two processes which provide the best evidence for the motion of particles in matter.

3. Which single term is used to describe the mixing of copper sulphate and water kept in a beaker on its own?

Diffusion is the term used to describe the mixing of copper sulphate and water kept in a beaker on its own.

4. When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?

The characteristic of matter illustrated by this observation is that the particles of matter have spaces between them.

5. Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation?

This observation displays that each crystal of Potassium Permanganate must be made up of millions of small particles i.e. particles of matter are very small.

6. When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?

This illustration shows that the particles are constantly moving in all directions.

7. A piece of chalk can be broken into small particles by hammering, but a piece of iron cannot be broken into small particles by hammering. Which characteristic of the particles of matter is illustrated by these observations?

The matter is made up of small particles which attract each other, and the attraction differs from substance to substance. Chalk breaks easily on hammering, but iron cannot be broken, which shows that the particles of iron attract each other with greater force.

Page no: 18

8. What is the scientific name of the particles which make up matter?

Atoms or molecules make up matter, or matter is composed of atoms/molecules.

9. Name a process by which a drop of ink spreads in a beaker of water

Lakhmir Singh Solutions Class 9 Chemistry Chapter 1 Matter In Our Surroundings-1

Diffusion is the process by which a drop of ink spreads in a beaker containing water.

10. What is the general name of :

(a) Rigid form of matter?

(b) Fluid form of matter?

(a) Solid is the rigid form of matter

(b) Liquid and Gas are the fluid forms of matter.

11. Out of solids, liquids and gases, which one has:

(a) Maximum movement of particles?

(b) Maximum interparticle attractions?

(a) Gases have maximum movement of particles.

(b) Solids have maximum interparticle attractions

12. A substance has a definite volume but no definite shape’. State whether this substance is a solid, a liquid, a gas.

Liquid has a definite volume but no definite shape.

13. Name the physical state of matter which can be easily compressed.

Gas is the physical state of matter that can be easily compressed.

14. ‘A substance has a definite shape as well as definite volume’. Which physical state is represented by the statement?

A solid is a substance having a definite shape as well as a definite volume.

15. A substance has neither a fixed shape nor a fixed volume. State whether it is a solid, a liquid or a gas.

Gas does not have a fixed shape and fixed volume.

16. Name two gases which are supplied in compressed form in homes and hospitals.

LPG (Liquefied Petroleum Gas) and Oxygen Gas are the two gases which are supplied in compressed form in houses and hospitals.

17. Write the full form of the following:

(a) LPG (b) CNG

(a) LPG – Liquefied Petroleum Gas.

(b) CNG – Compressed Natural Gas.

18. Which of the two diffuses faster: a liquid or a gas?

The gas diffuses faster than liquid because the particles of gases are more spacious and have high kinetic energy.

19. Which of the two diffuses slower: bromine vapour into air or copper sulphate into the water?

Copper sulphate diffuses slower as compared to bromine vapour in the air because the rate of diffusion is faster in gases than in liquids.

20. State whether the following statement is true or false:

Red-brown bromine vapour diffuses into the air in a gas jar, but the colourless air molecules do not diffuse bromine vapour.

False. Air also diffuses into the bromine vapour because air is colourless. It is not a visible movement.

21. A bottle of perfume was opened in a room. The smell of its vapours spread in the entire room. Name the property of gases which is responsible for this behaviour of perfume vapours.

Diffusion is the property of gases which is responsible for this behaviour of perfume vapours.

22. If a fish is being fried in a neighbouring home, we can smell it sitting in our own home. Name the property which brings this smell to us.

Diffusion is the property which brings this smell to us.

23. Name one property of liquids and gases which tells us that their molecules are moving constantly.

Diffusion is the property of liquids and gases which tells us that their molecules move constantly.

24. Fill in the following blanks with suitable words:

(a) The best evidence that the particles of matter are constantly moving comes from the studies of….. and…..

(b) The smell of perfume gradually spreads across a room due to ….

(d) At room temperature, the forces of attraction between the particles of solid substances are …. than those which exist in the gaseous state.

(e) The arrangement of particles is less ordered in the ….. state. However, there is no order in the … state.

(a) Diffusion; Brownian motion.

(b) Diffusion.

(d) Much more.

(e) Liquid; Gaseous.

Page no: 19

Short Answer Type Questions

25. State two characteristics of matter demonstrated by:

(a) Diffusion

(b) Brownian motion

(a) Diffusion:

(i)Matter is made up of tiny particles

(ii)The particles of matter are constantly moving.

(b) Brownian motion:

(i) The particles of matter are very small.

(ii) The particles of matter are constantly moving.

26. Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is the phenomenon known as?

Robert Brown studied the movement of pollen grains suspended in water through a microscope. It was found that pollen grains move rapidly through water in an irregular way. This phenomenon is Brownian motion.

27. When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?

The observation of the purple colour spreading throughout the water is that the crystal of potassium permanganate is made up of many small particles, and these particles of water have spaces between them.

28. When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuses into the air. Explain how bromine vapour diffuses into the air.

When a gas jar containing air is inverted over a gas jar containing bromine vapour, both bromine and air molecules move and collide with one another and bounce back in all directions, due to which we see a uniform red-brown colour in both jars.

29. Describe, in your own words, what happens to the particles when salt dissolves in water.

Salt, when dissolves in water, the tiny particles occupy the spaces between the water particles and mix with them, thus giving a taste to water. There won’t be any increase in the volume of water.

30. Explain why we can easily move our hand in the air, but to do the same through a plank of wood, we need a karate expert.

There will be a weak force of attraction between the particles in the air. So we can move our hands on air, whereas the particles in solid plank are closely packed, and a strong force of attraction exists between them. Hence it needs a huge force to overcome the attraction which a karate expert can do.

31. Give one example of the diffusion of a solid in another solid.

Diffusion of a solid into another solid is an extremely slow process because the particles do not move from the fixed positions, and they vibrate. When two metal blocks are packed close to each other, the particles diffuse from one another after a few years.

32. Explain why the diffusion of the solid in another solid is a very slow process.

Diffusion is a slow process in solids because the particles do not move from their fixed positions and only vibrate.

33. Which of the following diffuses fastest, and which is the slowest? Solid, Liquid and Gas. Give reasons for your answer.

Solids diffuse the slowest as the particles in solids do not move from their fixed positions.

Gases diffuse the fastest as the particles in gases move very quickly in all directions.

34. Explain the following:

When an incense stick is lighted in the corner of a room, its fragrance spreads quickly in the entire room.

The fragrance of an incense stick spreads quickly because the particle moves continuously in all directions. Both air and fragrance have large intermolecular spaces; thus, they can easily occupy the spaces of the other.

35. Name the three states of matter. Give one example of each.

(i) The solid state – Ice.

(ii) The liquid state – Water.

(iii) The gas state – Air.

36. State two characteristic properties of each of:

(a) a solid (b) a liquid (c) a gas

1. It has a strong intermolecular force of attraction between particles

2. It has a definite shape and volume

1. It does not have a definite shape but has a fixed volume

2. They generally flow

1. It can be compressed easily

2. It has the ability to fill the container completely.

37. Why do gases have neither a fixed shape nor a fixed volume?

Gases do not have a fixed shape or volume, so the particles are freely moving. They do not have a fixed position or spaces between them.

38. How do solids, liquids and gases differ in shape and volume?

(i) Solids – They have a fixed shape and a fixed volume.

(ii) Liquids – They have a fixed volume but no fixed shape.

(iii) Gases – They neither have a fixed shape nor a fixed volume.

39. Arrange the following substances in increasing order of force of attraction between their particles (keeping the substance having the minimum force of attraction first): Water, Sugar, Oxygen

Oxygen < Water < Sugar

Oxygen has the minimum force of attraction as it is a gas, and then water and then sugar.

40. Give two reasons to justify that:

(a) Water is a liquid at room temperature.

(b) An iron almirah is a solid.

(a) (i)Water has a fixed volume but no fixed shape.

(ii) Water flows freely.

(b) (i) The iron almirah has a fixed shape and volume.

(ii) Particles of the iron almirah do not flow freely and have a fixed position.

41. (a) When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance quickly spreads in the entire room. Name the process involved in this.

(b) A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother’s room. Explain how the smell could have reached her brother’s room.

(a) Diffusion is the process involved in this as the fragrance quickly spreads in the entire room.

(b) The smell of food being cooked reaches the other room by the diffusion of gases released into the air during the cooking of food.

42. (a)what does the diffusion of gases tell us about their particles? (b) Give one example of the diffusion of gases in a liquid.

(a) Diffusion of gases tells us that matter comprises of tiny particles and has space between them. The particles of matter are in constant motion.

(b) Gases like carbon dioxide and oxygen present in the atmosphere diffuse into water (ponds, lakes etc.) and dissolve in it.

43. Give reason for the following observation:

The smell of hot sizzling food reaches us even from a considerable distance, but to get the smell of cold food, we have to go close to it.

The rate of diffusion of hot gas is faster than that of cold gas. So the particles have greater kinetic energy when the gas is hot and moves faster.

44. Explain how the smell of being cooked in the kitchen reaches us even from a considerable distance.

The smell of food being cooked reaches us even from a considerable distance because of the process of diffusion.

45. Explain why, when a bottle of perfume is opened in a room, we can smell it even from a considerable distance.

The particles of perfume start diffusing around the air and move from lower concentration by virtue of their kinetic energy.

46. When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue. Why?

When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue because of the diffusion of copper sulphate particles into water.

47. Honey is more viscous than water. Can you suggest why?

Honey is more viscous than water because the force of attraction between the particles of honey is much more than that of the force of attraction of particles in water.

48. Explain why:

(a) Air is used to inflate tyres.

(b) Steel is used to make railway lines.

(a) When air is blown, the particles in the air push the tyre walls from inside and exert pressure on them.

(b) Steel is used to make railway lines because it is a rigid object having a definite shape and volume and is strong also .

49. Explain why diffusion occurs more quickly in a gas than in a liquid.

Diffusion occurs more quickly in a gas than in liquids because the particles in gases move very quickly in all directions and freely, but in the case the liquids, the particle movement will be slow because of the intermolecular force of attraction.

Long Answer Type Questions Page no: 20

50. (a) What is meant by ‘diffusion’? Give one example of diffusion in gases.

(b) Why do gases diffuse very fast?

(a) Diffusion is the mixing of a substance with another substance due to the motion of its particles. The smell of perfume spreading over a whole room is an example of diffusion.

(b) Gases diffuse fast because of the large space between the particles in gases and high kinetic energy.

(c) Carbon dioxide and oxygen are the two gases in air which dissolve in water by diffusion. Carbon dioxide is important for aquatic plants for photosynthesis. Oxygen is used by aquatic animals for breathing.

51. (a) Compare the properties of solids, liquids and gases in tabular form.

(b) Give two reasons for saying that wood is a solid.

(b) (i) Wood is a rigid object which has a tendency to maintain its shape when subjected to outside force.

(ii) It has a definite shape and definite volume.

52. (a) Why does a gas exert pressure?

(b) Why does a gas fill a vessel completely?

(a) When gas is stored in a container, the fast-moving particles of the gas collide with each other, thus exerting pressure on the walls of the container

(b) They have high kinetic energy and negligible force of attraction, so they can move constantly moving with high speed in all directions

(c) Gases are easily compressible as they have large intermolecular spaces. The gas particles can come closer when external pressure is applied on gases.

53. (a) Define matter. Give four examples of matter.

(b) What are the characteristics of matter?

(a) Matter is anything that occupies and has mass. Wood, air, and water are examples of matter.

(b)1. The matter is made up of tiny particles

2. The particles of matter attract each other.

3. The particles of matter have spaces between them.

4. The particles of matter are constantly moving.

54. a) What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion.

(b) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

Lakhmir Singh Solutions Class 9 Chemistry Chapter 1 Matter In Our Surroundings-2

The zig-zag movement of the small particles suspended in a liquid or a gas is called the Brownian movement.

(b) (b) These dust particles move in a haphazard way because they are constantly hit by the fast-moving particles of air.

Multiple Choice Questions (MCQs)

55. When a crystal of potassium permanganate is placed at the bottom of the water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of:

(a) Distribution

(b) Intrusion

(d) Effusion

Option (c) is the answer.

56. Which one of the following statements is correct in respect of fluids?

(a) Only gases behave as fluids

(b) Gases and solids behave as fluids

(d) Only liquids are fluids.

Option (c) is the answer .

57. A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents the correct arrangement?

(a) Water, air and wind

(b) Air, sugar, oil

(d) Salt, juice, air

58 In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

(i) Increasing pressure on hydrogen contained in a closed container

(ii) Some hydrogen gas leaking out of the container

(iii) Increasing the volume of the container of hydrogen gas

(iv) Adding more hydrogen gas to the container without increasing the volume of the container

(a) (i) and (iii)

(b) (i) and (iv)

(d) (ii) and (iv)

Page no: 21

59. Out of the following, an example of matter which can be termed as fluid is:

(b) Sulphur

(d) Phosphorus

60. The best evidence for the existence and movement of particles in liquids was provided by:

(a) John Dalton

(b) Ernest Rutherford

(d) Robert Brown

Option (d) is the answer.

61. A form of matter has no fixed shape, but it has a fixed volume. An example of this form of matter is:

(a) Krypton

(b) Kerosene

(d) Carbon dioxide

Option (b) is the answer.

62. Which of the following statement is correct?

(a) The particles of matter are very, very small

(b) The particles of matter attract one another

(d) The particles of all the matter have spaces between them

63. When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapour of bromine from the lower jar goes upward into the jar containing air. In this experiment:

(a) Air is heavier than bromine

(b) Both air and bromine have the same density

(d) Bromine cannot be heavier than air because it is going upward against gravity.

64. When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spread into the upper gas jar, making both the gas jar appears brown in colour. Which of the following conclusion obtained from these observations is incorrect?

(a) Bromine vapour is made of tiny particles which are moving

(b) Air is made up of tiny particles which are moving

(d) Even though bromine vapour is heavier than air, it can move up against gravity

65. Which of the following statement is not true?

(a) The molecules in a solid vibrate about a fixed position

(b) The molecules in a liquid are arranged in a regular pattern

(d) The molecules of gas occupy all the space available.

This chapter deals with the classification of matter based on physical properties and daily life examples.

Also, visit Lakhmir Singh Solutions for Class 9 Chemistry to get complete solutions for all chapters.

Register with BYJU'S & Download Free PDFs

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings Intext and Exercises question answers based on rationalised NCERT books published for session 2024-25. Get here the solutions of Page 3, Page 6, page 9, page 10 and Exercises question answers in English Medium and Hindi Medium.

Class 9 Science Chapter 1 Answers in English Medium

Class 9 Science Chapter 1 Exercises
Class 9 Science Chapter 1 Intext Questions
Class 9 Science Chapter 1 MCQ
Class 9 Science Chapter 1 Extra Questions
Class 9 Science Chapter 1 Hindi Medium
Class 9 Science Chapter 1 Notes in English
Class 9 Science Chapter 1 Notes in Hindi
Class 9 Science Chapter 1 NCERT Book
Class 9 Science NCERT Solutions
Class 9 all Subjects NCERT Solutions

NCERT Class 9 Science textbook, Chapter 1 Matter in Our Surroundings covers the most of the important topics. Definition of Matter Characteristics of Matter, three states of matter – Solid, Liquid, and Gas Comparison of the characteristics of these states Interconversion of States of Matter.

The main topics of class 9 science chapter 1 Change of state melting, freezing, evaporation, and condensation Effect of change of temperature on the states of matter. Evaporation : Factors affecting the rate of evaporation Applications of evaporation. Sublimation : Definition of sublimation Examples of substances that sublime. Diffusion : Definition of diffusion Examples of diffusion in daily life Characteristics of Particles of Matter.

Download App for Class 9 all Subjects free. UP Board Solutions, NCERT Solutions, NCERT Solutions Offline Apps 2024-25 are free to download for all students using latest NCERT Books 2024-25. Here you can use NCERT Solutions of chapter 1 of Class 9 Science online or download in PDF file format for offline use. Download Class 9 Science Solutions Apps in Hindi & English version for offline use.

Particles in solids, liquids, and gases. Kinetic Theory of Matter : Explanation of the kinetic theory Explanation of the behavior of particles in matter according to the kinetic theory. Measurement of Matter : Mass and weight measuring the mass of an object Units of measurement. Density and Relative Density : Definition of density Calculation of density Relative density and its applications.

These are the main topics covered in Chapter 1 of the NCERT Class 9 Science textbook. This chapter provides an introduction to the fundamental concepts related to matter and its various properties. It serves as the foundation for further exploration of chemistry and physics topics in the curriculum.

Preparing for NCERT Class 9 Science Chapter 1 Matter in Our Surroundings, or any chapter, requires a systematic approach to understanding the concepts and practicing them effectively. Here are some tips on how students can prepare for this chapter in a better way. Start by reading the chapter carefully from the NCERT textbook. Pay attention to the text, diagrams, and examples provided. While reading, make concise notes of important concepts, definitions, and key points. This will help you with quick revision.

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings all the in-text questions as well as chapter end exercises question’s answers are given below. Solutions are available in Hindi and English Medium to study online or download in PDF form free.

Ensure that you have a clear understanding of fundamental concepts such as matter, states of matter, and the kinetic theory of matter. Use diagrams and illustrations provided in the book to visualize how particles are arranged in different states of matter and during phase changes. Work through the examples and exercises provided at the end of the chapter. Practice solving numerical problems related to density, and other concepts to reinforce your understanding.

If you find any topics challenging, consult additional resources like reference books, online tutorials, or videos to clarify your doubts. If you have questions or face difficulties in understanding certain concepts, don’t hesitate to seek help from your teacher or discuss them with your classmates. Where possible, perform simple experiments related to states of matter, diffusion, or density to gain practical insights into the concepts. Create Flashcards: Create flashcards for important terms, definitions, and formulas. This can help you with quick revision.

Consistent practice is key to mastering any subject. Allocate regular study time to science and review the chapter periodically. Take self-assessment quizzes or practice tests to gauge your understanding of the chapter. A few days before your exams, revise the chapter thoroughly. Focus on your notes and important points. Keep your notes, textbooks, and other study materials well-organized so that you can easily access them for review.

Science is about exploring and asking questions. Stay curious and be open to learning new concepts and ideas. Remember that understanding the fundamental concepts in Chapter 1 of Class 9 Science is crucial as it forms the basis for more advanced topics in chemistry and physics in the later chapters. Building a strong foundation in this chapter will benefit you throughout your science studies.

Tiwari Academy is an online educational platform that provides resources and materials to help students prepare for their CBSE (Central Board of Secondary Education) Class 9 Science exams, including Chapter 1. Tiwari Academy offers free access to a wide range of study materials, including NCERT solutions, textbooks, revision notes, and practice papers. These materials are designed to help students understand and revise the content effectively.

Class 9 Science Chapter 1 Extra Practice Questions

Why do substance undergo change in physical state.

Substance undergo change in physical state because both inter-particle spaces and inter-particle forces can be changed by changing the condition of temperature and pressure.

When sugar is dissolved in water, there is hardly an increase in volume. Which characteristic of matter is illustrated by this observation?

This is because of the presence of inter particle space or empty spaces. Particles or molecules of water can fill the empty space in the particles or molecules of sugar and vice versa. That is why there is hardly any change in the volume as a result of dissolution of sugar in water.

Define gaseous state of a substance.

A substance is said to be in the gaseous state if under normal pressure, its boiling point is below the room temperature.

How does pressure help in the liquefication of a gas?

Increase in pressure helps in the liquefication of a gas. The particles or molecules of a gas come closer and closer as the pressure is being increased gradually. They ultimately condense and as a result, the gas liquefies or changes into the liquid state.

Solids are generally very heavy while gases are light. Explain.

In the solids, the particle are very closely packed. As a result, the number of particles per unit volume is quite large. Therefore, the solids are normally quite heavy. In the gases, the particles are loosely packed. The number of particle per unit volume is completely small. Therefore, gases are light.

Tiwari Academy offers comprehensive NCERT solutions for Class 9 Science Chapter 1, guiding students step-by-step through exercises in the NCERT textbook. These solutions are invaluable for students, helping them decipher the best ways to tackle diverse problems. The platform might also feature video tutorials that break down intricate concepts of the chapter. By using visual tools and explanations, students can more easily understand challenging subjects.

By working through additional exercises and questions, students solidify their comprehension and enhance their problem-solving capabilities. Tiwari Academy typically provides succinct and organized revision notes, which are instrumental for quick recaps of the chapter’s main ideas and crucial details. Some digital platforms, including Tiwari Academy, even have online exams that emulate the actual test atmosphere, which can be instrumental for student evaluation and exam readiness.

Class 9 Science Chapter 1 Matter in Our Surroundings

Question 1: Solids are normally not compressible. Why can a sponge be readily pressed? Answer 1: A sponge made up of rubber has a large number of fine pores in which air remains filled. When the sponge is pressed, the air from the pores escapes and vacant space are left. Therefore, the sponge can be readily pressed on applying pressure.

Accessible around the clock, Tiwari Academy’s digital tools let students learn at a rhythm that suits them. This constant availability is especially beneficial for those who wish to revisit the chapter several times. Doubt Resolution: Certain online educational platforms grant students the opportunity to post their chapter-related queries. These queries might be addressed by seasoned educators or tutors, offering students needed explanations. Additionally, Tiwari Academy might have archives of past exam papers with their solutions. Working on these papers can assist students in acclimating to the exam structure and honing their time-management skills.

Question 2: Why do we sweat on a humid day? Answer 2: In humid day, the air around us has already high percentage of water vapours. Therefore, the water coming from the skin gets less opportunity to charge into vapours and remains sticking to our body. We therefore, swear more on a humidity day.

Tiwari Academy online platforms have discussion forum where students can interact, share their experiences, and seek advice from peers. It’s important to note that the availability of specific resources and features may vary on Tiwari Academy or any other educational platform. Students should explore the platform to determine which resources are most helpful for their individual learning needs and preferences. Additionally, using a combination of resources, including the official NCERT textbook, school notes, and online materials like Tiwari Academy, can provide a comprehensive approach to exam preparation.

From an examination point of view, NCERT Class 9 Science Chapter 1 Matter in Our Surroundings, holds significant importance for several reasons. Chapter 1 introduces fundamental concepts related to matter, states of matter, and the kinetic theory of matter. These concepts serve as the foundation for understanding more advanced topics in chemistry and physics in higher classes. A strong grasp of these basics is crucial for building a solid scientific knowledge base.

Question 3: Kelvin scale of temperature is regarded as better than the Celsius scale. Give reason. Answer 3: In the Celsius scale of temperature we often come across a negative sign for the temperature (e.g., -8.5⁰C). Since the sign is always positive in the Kelvin scale, it is regarded as better.

Questions from 9th science chapter 1 are often included in Class 9 Science examinations. This chapter is considered an essential part of the curriculum, and students can expect to see questions related to states of matter, properties of matter, and related calculations in their exams. Chapter 1 helps students develop a deeper understanding of how matter behaves, how particles are arranged in different states, and how temperature affects matter. This conceptual understanding is not only essential for exams but also for a broader understanding of science.

The chapter 1 of 9th science includes numerical problems related to density and the states of matter. These problems require students to apply mathematical concepts to scientific scenarios, which is a valuable skill for both exams and real-world applications. The concepts discussed in Chapter 1 are applicable to various everyday situations, such as cooking, weather changes, and material properties. Understanding these applications can help students relate science to their daily lives and answer practical questions in exams.

Important Questions on 9th Science Chapter 1

Naphthalene balls disappear with time without leaving any solid. why.

Naphthalene shows the property of sublimation. Evaporation of naphthalene takes place easily and so it disappears during course of time without leaving a solid.

We can get the smell of perfume sitting several meters away. Why?

Perfumes vaporize very fast and its vapours diffuse into air easily. That is why we can smell perfume sitting several meters away.

Water at room temperature is a liquid. Give reason.

Water at room temperature is a liquid because it has fluidity and has definite volume but no definite shape.

An iron almirah is a solid at room temperature. Give reason.

An iron almirah is a solid at room temperature because it is rigid and has a definite shape.

Why is ice at 273 K more effective in cooling than water at the same temperature?

Ice at 273 K is less energetic than water. It is because of the difference in the latent heat of fusion which is present in water at the same temperature in the form of extra energy.

What produces more severe burns, boiling water or steam?

Steam produces more severe burns than boiling water. This is because steam has more energy than boiling water, present in it in the form of latent heat of vaporization.

Successfully mastering the first chapter of the textbook can boost a student’s confidence in their ability to handle the rest of the science curriculum. It sets a positive tone for the subject and encourages students to explore further. The knowledge gained from Chapter 1 will be built upon in higher classes. Topics like states of matter, kinetic theory, and properties of matter are revisited and expanded upon in later chapters and classes.

A strong foundation in Chapter 1 is, therefore, essential for future success. In summary, NCERT Class 9 Science Chapter 1 is not only important for scoring well in exams but also for laying the groundwork for a deeper understanding of science in the later stages of education. Students should dedicate time and effort to comprehensively learn the concepts presented in this chapter to ensure a strong foundation in science.

NCERT Solutions Class 9 Science Chapter 2 »

IMAGES

Selina Solutions Class 9 Concise Chemistry Chapter 1 The Language of
Selina Solutions Class 9 Concise Chemistry Chapter 1 The Language of
Selina Solutions Class 9 Concise Chemistry Chapter 2 Chemical Changes
Class 9 Chemistry Worksheet on Chapter 1 Matter in Our Surroundings
9th Class Chemistry Solved Exercises Chapter 1
Important Questions for Class 9 Science Chapter 1 Matter in Our

VIDEO

Top 5 Case-Based Questions of Matter in Our Surroundings
Class 9
Class 9 Chemistry Chapter 1
Class 9 chemistry chapter 1 long and short answer
MCQs Chapter 1 Chemistry Class 9th
Case Study Questions -1

COMMENTS

Case Study Questions Class 9 Science Matter in our Surroundings
At Case Study Questions there will given a Paragraph. In where some Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks or 4 marks. CBSE Case Study Questions Class 9 Science - Matter in our Surroundings Case Study 1: 1.) A matter is anything that has mass and occupies ...
Class 9 Science Case Study Questions Chapter 1 Matter in our
b) Dissolution, combustion, sublimation, and oxidation. c) Fermentation, photosynthesis, respiration, and digestion. d) Oxidation, reduction, precipitation, and ionization. Answer: a) Evaporation, condensation, melting, and freezing. Hope the information shed above regarding Case Study and Passage Based Questions for Class 9 Science Chapter 1 ...
Important Questions for Class 9 Chemistry Chapter 1 Matter in Our
By practicing these Class 9 important questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 9 Annual examinations. Download Class 9 Chemistry Chapter 1 - Matter in Our Surroundings Important Questions with Answers PDF by clicking on the button below. Download PDF. Recommended Video
Class 9 Science Case Study Questions
Class 9 science case study question 1. Gases are highly compressible as compared to solids and liquids. The liquefied petroleum gas (LPG) cylinder that we get in our home for cooking or the oxygen supplied to hospitals in cylinders is compressed gas. Compressed natural gas (CNG) is used as fuel these days in vehicles.
Case Study Questions -1
Case Study Questions -1 | CBSE Class 9 Chemistry | Surabhi Ma'am | Elementary Chemistry by Vedantu. In this online class Surabhi ma'am will explain how to so...
PDF Class Ix Chemistry Chapter 1 Matter in Our Surroundings Case Study
CLASS IX CHEMISTRY CHAPTER 1 - MATTER IN OUR SURROUNDINGS CASE STUDY QUESTIONS 1. In an experimental activity, crushed ice was taken in a beaker. A thermometer is fitted in such a way that its bulb was thoroughly surrounded by ice. The beaker is now slowly heated and temperature was regularly noted.
NCERT Solutions for Class 9 Science Chapter 1 Matter in Our
NCERT Solutions for Class 9 Science (chemistry) Chapter 1 Matter in Our Surroundings are given below. In these solutions, we have answered all the intext and exercise questions provided in NCERT class 9 science textbook. Class 9 NCERT Solutions Science Chapter 1 provided in this article are strictly based on the CBSE syllabus and curriculum.
Case Study Questions of Chapter 1 Matter in our Surroundings PDF
Case study Questions on Class 9 Science Chapter 1 are very important to solve for your exam. Class 9 Science Chapter 1 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 9 Science Chapter 1 Matter in our Surroundings
NCERT Solutions for Class 9 Science Chapter 1 Matter in Our ...
NCERT Solutions Class 9 Science Chapter 1 - Free PDF Download. NCERT Solutions for Class 9 Science (Chemistry) Chapter 1 Matter in Our Surroundings is an important study material from the standpoint of your CBSE Class 9 Science examination. Detailed NCERT Solutions for Class 9 Chemistry provided here will help you understand the fundamental concepts taught in the chapter.
NCERT Solutions for Class 9 Chemistry Chapter 1 Free PDF Download
NCERT Solutions for Class 9 Chemistry Chapter 1 - Matter in Our Surroundings. This article is about NCERT Solutions for Class 9 Chemistry Chapter 1. First of all, Chemistry is a branch of science that involves the study of matter. It has a lot of chemical formulas and other difficult concepts. Hence, it can be a hard subject for many students.
Case Study Questions for Class 9 Science Chapter 1 Matter in Our
Case Study Questions for Class 9 Science Chapter 1 Matter in Our Surroundings. Here we are providing case study questions for class 9 science chapter 12 sound. Students are suggested to go through each and every case study questions for better understanding of the chapter. Case Study/Passage Based Questions: Question 1:
NCERT Exemplar for Class 9 Science Chapter 1
Free PDF download of NCERT Exemplar for Class 9 Science Chapter 1 - Matter in Our Surroundings solved by expert Science teachers on Vedantu.com as per NCERT (CBSE) Book guidelines. All Chapter 1 - Matter in Our Surroundings exercise questions with solutions to help you to revise complete syllabus and score more marks in your examinations.
Matter in Our Surroundings Class 9 Notes CBSE Science Chapter 1 [PDF]
Yes, Revision Notes of Class 9 Chapter 1 are the ultimate and end saviour for before the exams. The students are required to go through other study material as well. The first step is to properly read NCERT Class 9 Science, Chapter 1 - "Matter in Our Surroundings." Study the chapter attentively and attempt to grasp the fundamental principles.
NCERT Solutions For Class 9 Science Chapter 1 Matter in Our Surroundings
NCERT Solutions For Class 9 Science Chapter 1 - Extra Questions Solved. I. Multiple Choice Questions in Class 9 Science Chapter 1 Matter in Our Surroundings. Choose the correct option: 1. Evaporation of a liquid occurs at. (a) boiling point. (b) a fixed temperature. (c) temperature lower than boiling point.
NCERT Solutions for Class 9 Science Chapter 1
NCERT Solution of class 9 Science chapter 1 has been created, keeping in mind the primary goal of helping students to secure more marks and improve grades. The academic requirements and needs of students have been addressed in the solution for class 9 Science chapter 1. The topics in chapter 1 related to Matter in Our Surrounding are discussed according to the CBSE syllabus.
Class 9 NCERT Solutions Chemistry Chapter 1
Solution 9. Concept insight: The key to this answer is to recall the names of the processess of conversion of one state to another. NCERT Solutions for Class 9 Chemistry CBSE Chapter 1: Get free access to Matter in Our Surroundings Class 9 Solutions which includes all the exercises with solved solutions.
NCERT Exemplar Class 9 Science Solutions for Chapter 1
The NCERT Exemplar Solution for Class 9 Science Chapter 1 Matter in Our Surrounding is provided here for the benefit of the students. Studying the NCERT Exemplar Solution will give you in-depth knowledge of the concepts discussed in the chapter. NCERT Exemplar questions are designed in such a way that students can learn all the basic and ...
Extra Questions for Class 9th: Ch 1 Matter in Our ...
Q4. Arrange the three states of matter in the increasing order of: (i) rate of diffusion. (ii) particle motion. Answer. (i) Rate of diffusion: solid < liquid < gas. (ii) Particle motion: solid < liquid < gas. Q5. Mention two properties of water to justify that water is liquid at room temperature.
Matter in Our Surroundings Class 9 Extra Questions Science Chapter 1
Matter in Our Surroundings Class 9 Extra Questions Hots (Higher Order Thinking Skills) Question 1. The diagram below shows burning of an oil lamp. Draw the arrangement of particles of position 'X' and 'Y' when the lamp is burning. Question 2. 'A small volume of water in a kettle can fill a kitchen with steam'.
Extra Questions for Class 9 Science Chapter 1 Matter in ...
9. Define latent heat of fusion. Answer: Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point. 10. Define sublimation. Answer: Sublimation is the change of gaseous state directly to solid state without going through liquid state and vice-versa. 11.
Lakhmir Singh Solutions Class 9 Chemistry Chapter 1 Matter In Our
Solution: The condition for something to be called as the matter is that it should occupy space and have mass. 2. Name two processes which provide the best evidence for the motion of particles in matter. Solution: Diffusion and Brownian motion are the two processes which provide the best evidence for the motion of particles in matter.
NCERT Solutions Class 9 Science Chapter 1 Matter in Our Surroundings
on October 16, 2023, 10:44 AM. NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings Intext and Exercises question answers based on rationalised NCERT books published for session 2024-25. Get here the solutions of Page 3, Page 6, page 9, page 10 and Exercises question answers in English Medium and Hindi Medium.
NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings
EXERCISE 1.2 - 4 Questions with Solutions; EXERCISE 1.3 - 4 Questions with Solutions; EXERCISE 1.4 - 5 Questions with Solutions; EXERCISE 1.5 - 9 Questions with Solutions. Download the free PDF of Chapter 1 Matter in Our Surroundings or save the solution images and take the print out to keep it handy for your exam preparation.

Case Study Questions Class 9 Science Matter in our Surroundings

CBSE Case Study Questions Class 9 Science – Matter in our Surroundings

Case Study 2:

Case Study 3:

Case Study 4:

Case Study 5:

Leave a Reply Cancel reply

We have a strong team of experienced Teachers who are here to solve all your exam preparation doubts

Class 9 Science Case Study Questions Chapter 1 Matter in our Surroundings

Matter in our Surroundings Case Study Questions With Answers

You Might Also Like

Case Study Questions of Chapter 1 Matter in our Surroundings PDF Download

Matter in our Surroundings Case Study Questions With answers

Leave a Comment Cancel reply

Download India's best Exam Preparation App Now.

NCERT Solutions for Class 9 Chemistry Chapter 1 Free PDF Download

CBSE Class 9 Chemistry Chapter 1 – Matter in Our Surroundings NCERT Solutions

Sub-topics covered under NCERT Solutions for Class 9 Chemistry Chapter 1

NCERT Solutions for Class 9 Chemistry Chapter 1

Below is a brief explanation of the sub-units of chapter 1:

Download Toppr – Best Learning App for Class 5 to 12

Customize your course in 30 seconds

NCERT Solutions for Class 9

Leave a Reply Cancel reply

Download the App

Case Study Questions for Class 9 Science Chapter 1 Matter in Our Surroundings

Related Posts

Leave a Reply Cancel reply

Discover more from Gurukul of Excellence

NCERT Solutions for Class 9 Science Chapter 1 - Matter in Our Surroundings

Access NCERT solutions for Class 9 Science Chapter – 1 Matter in our Surroundings

Ans: Matter is anything that occupies space and has some mass. There are three states of matter called Solid, Liquid and Gas. On the basis of these three states, we can define that which of this is a matter:

2. Give reasons for the following observation:

Matter is anything that occupies space and has some mass. There are three states of matter called Solid, Liquid and Gas.

Ans:

3: Give Reasons:

4: Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.

Intext Exercise -3

2: What is the physical state of water at:

Ans: Physical state corresponds to the state of matter whether it exists in solid, liquid or gas.

3: For any substance, why does the temperature remain constant during the change of state?

Naphthalene balls disappear with time without leaving any solid.

5: What is the physical state of water at:

6: Give two reasons to justify:

7: Why is ice at 273 K more effective in cooling than water at the same temperature?

NCERT Solutions for Class 9 Science

Important Concepts Covered in Chapter 1 - Matter in Our Surroundings of Class 9 Science NCERT Solutions

Class 9 Science Chapter 1 Matter in Our Surroundings

Why is it Beneficial for Students to Study from NCERT solutions class 9 Science Matter in Our Surroundings?

Conclusion

FAQs on NCERT Solutions for Class 9 Science Chapter 1 - Matters In Our Surroundings

NCERT Solutions for Class 9

Extra Questions for Class 9th: Ch 1 Matter in Our Surrounding Science

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings

Matter in Our Surroundings Class 9 Science Extra Questions and Answers

Short Answer Type Questions

Long Answer Type Questions

Value-Based Questions

Lakhmir Singh Solutions Class 9 Chemistry Chapter 1 Matter In Our Surroundings

Lakhmir Singh Solutions for Class 9 Chemistry Chapter 1 Matter in Our Surroundings

Access Lakhmir Singh Solutions for Class 9 Chemistry Chapter 1 Matter in Our Surroundings

Leave a Comment Cancel reply

Register with BYJU'S & Download Free PDFs

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

Class 9 Science Chapter 1 Answers in English Medium

Class 9 Science Chapter 1 Extra Practice Questions

When sugar is dissolved in water, there is hardly an increase in volume. Which characteristic of matter is illustrated by this observation?

Define gaseous state of a substance.

How does pressure help in the liquefication of a gas?

Solids are generally very heavy while gases are light. Explain.

Important Questions on 9th Science Chapter 1

We can get the smell of perfume sitting several meters away. Why?

Water at room temperature is a liquid. Give reason.

An iron almirah is a solid at room temperature. Give reason.

Why is ice at 273 K more effective in cooling than water at the same temperature?

What produces more severe burns, boiling water or steam?

NCERT Solutions Class 9 Science Chapter 2 »

IMAGES

VIDEO

COMMENTS