10th science assignment answer key 2021

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Chapter-wise NCERT Textbook Solutions of Class 10 Science PDF Download Free

NCERT Solutions for Class 10 Science PDF links available here are free to view and download on your devices. From CBSE 10th Science NCERT Solutions Chapterwise PDFs, you can discover various solved and unsolved questions and exercises along with sample papers & a list of important questions for every concept. Practicing all these questions and answers from the chapters of physics, chemistry, and biology will aid students to enhance their subject knowledge and secure good grades in the exams.

Free PDF Download of  NCERT Solutions for Class 10 Science English and Hindi Medium

Class 10 NCERT Science Solutions Book is the only guide that covers the complete syllabus with extra knowledge. From this ultimate guide, CBSE students can gain subject skills and utilize them during their final exams for better scores. If you are worried about who has been prepared these NCERT Textbook Solutions for 10th std science can keep their worries aside.

As it is designed by experienced subject teachers as per the latest Class 10 Science CBSE Syllabus. Download the free pdf links of English and Hindi medium 10th science NCERT Book Solutions along with CBSE Class 10 Science book PDF and kickstart your preparation without any hurdles.

• Chemical Reactions and Equations ( रासायनिक अभिक्रियाएँ और समीकरण )
• Acids, Bases and Salts ( अम्ल, क्षार एवं लवण )
• Metals and Non-metals ( धातु और अधातु )
• Carbon and Its Compounds ( कार्बन और इसके यौगिक )
• Periodic Classification of Elements ( तत्वों के आवर्त वर्गीकरण )
• Life Processes ( जैव-प्रक्रम )
• Control and Coordination ( नियंत्रण एवं समन्वय )
• How do Organisms Reproduce? ( जीव जनन कैसे करते है )
• Heredity and Evolution ( अनुवांशिकता एवं जैव विकास )
• Light Reflection and Refraction ( प्रकाश-परावर्तन एवं अपवर्तन )
• Human Eye and Colourful World ( मानव-नेत्र एवं रंगबिरंगी दुनियाँ )
• Electricity ( विद्युत )
• Magnetic Effects of Electric Current ( विद्युत धारा का चुम्बकीय प्रभाव )
• Sources of Energy ( उर्जा के स्रोत )
• Our Environment ( हमारा पर्यावरण )
• Management of Natural Resources ( प्राकृतिक संसाधनों का प्रबंधन )

MCQ Questions for Class 10 Science

Students preparing for the board examination should opt for CBSE Class 10 Science NCERT Solutions PDF and MCQ Questions for 10th Science with Answers PDF Study Resources as they play a crucial role in scoring better marks. So, download Physics, chemistry, biology MCQs with Answers Chapterwise PDFs from the below links & practice daily.

MCQ Questions for Class 10 Science Chemistry with Answers

• Chapter 1 Chemical Reactions and Equations MCQ Questions
• Chapter 2 Acids, Bases, and Salts MCQ Questions
• Chapter 3 Metals and Non-metals MCQ Questions
• Chapter 4 Carbon and Its Compounds MCQ Questions
• Chapter 5 Periodic Classification of Elements MCQ Questions

Biology MCQs For Class 10 Chapter Wise with Answers

• Chapter 6 Life Processes MCQ Questions
• Chapter 7 Control and Coordination MCQ Questions
• Chapter 8 How do Organisms Reproduce? MCQ Questions
• Chapter 9 Heredity and Evolution MCQ Questions
• Chapter 15 Our Environment MCQ Questions
• Chapter 16 Management of Natural Resources MCQ Questions

MCQ Questions for Class 10 Science Physics with Answers

• Chapter 10 Light Reflection and Refraction MCQ Questions
• Chapter 11 Human Eye and Colourful World MCQ Questions
• Chapter 12 Electricity MCQ Questions
• Chapter 13 Magnetic Effects of Electric Current MCQ Questions
• Chapter 14 Sources of Energy MCQ Questions

Along with NCERT Solutions and Multiple choice questions for class 10 science, we would also advise you to study important questions for class 10 Science from the material link dropped here. In the below sections, we are going to discuss each and every chapter covered in NCERT Science Textbook in short.

Class 10 NCERT Science Solutions for Physics Chemistry Biology Chapters Brief

The most important subjects for class 10 pursuing students are Science and Maths. Science plays a vital role in assisting students to select their streams in higher studies. If you are interested in science streams then having a good grip on the fundamentals concepts of science is very important. So, understand the concepts by following the NCERT Solutions for Class 10 Science PDF chapters brief discussed below and score high in exams.

Chapter 1 – Chemical Reactions and Equations (रासायनिक अभिक्रियाएँ और समीकरण )

In class 10 science, the first chapter is introduced with the chemistry concepts that help students to learn deeply about the basics of chemical reactions and equations. From this chapter, you will understand the way of writing chemical equations and balance them, types of chemical reactions, combination reaction, displacement reaction, double displacement reaction, effects of oxidation reactions, corrosion, rancidity.

Chapter 2 – Acids, Bases, and Salts (अम्ल, क्षार एवं लवण )

After getting a good grip on chemical reactions & equations concepts, it’s time to learn what are chemical properties and how they make things taste sour or bitter, their acidic or basic nature, and how substances are used to test this nature.

Moreover, you may acquire perfect knowledge about the importance of pH in everyday life, the pH range of acidic, basic &neutral solutions, and the wide applications of pH scale, chemical formulae, preparation, and chemical reactions of various important salts that are used in day-to-day life from this chapter.

Chapter 3 – Metals and Non-metals (धातु और अधातु )

Metals and Non-metals come under chemistry subject where it provides knowledge about physical properties, chemical properties of different metals and non-metals. Apart from that, you can also learn the reactivity of metals with non-metals and the properties of ionic compounds.

Chapter 4 – Carbon and Its Compounds (कार्बन और इसके यौगिक )

NCERT Class 10 Science Solutions of Chapter 4 deals with organic chemistry. Also, the chapter is about Carbon which is a versatile element found in many organic and inorganic compounds. Furthermore, you will learn the concepts like Covalent bonds in carbon, compounds derived from carbon, versatile nature, chemical properties of carbon, properties of Ethanol and Ethanoic acid, soaps, and detergents & their cleansing actions in this chapter.

Chapter 5 – Periodic Classification of Elements (तत्वों के आवर्त वर्गीकरण )

Have you ever wondered how the periodic table formed? If yes, then look at this chapter and learn how scientists classified elements based on their properties and organized them into the modern periodic table. Some of the major topics explained here are Döbereiner’s Triads, Newlands’ Law of Octaves and their limitations, trends in atomic size, valency, and physical & chemical properties of elements across the Modern Periodic Table.

Chapter 6 – Life Processes (जैव-प्रक्रम )

NCERT Solutions For Class 10 Science Chapter 6 Life Processes covers the discussion and explanation of various biological processes and reactions taking place in organisms. Apart from this, you will also learn a few major topics like What are Life Process?, Nutrition in Organisms: Autotrophic and Heterotrophic Nutrition, How do organisms obtain their nutrition, Nutrition in human beings: Respiration, Transportation & Excretion, Excretion in human beings and Plants in this chapter.

Chapter 7 – Control and Coordination (नियंत्रण एवं समन्वय )

In chapter 7 NCERT Solutions, kids will get the basic knowledge about the nervous system of human beings, an explanation about the anatomy of the Human Brain, coordination in plants, and hormones in animals.

Chapter 8 – How do Organisms Reproduce? (जीव जनन कैसे करते है )

Biology chapters can be very interesting for students to learn as they explain various modes of reproduction, including asexual and sexual reproductions, advanced types of reproduction, and diverse processes of reproduction.

Chapter 9 – Heredity and Evolution (अनुवांशिकता एवं जैव विकास )

One more biology chapter in NCERT Science solutions of class 10 is Heredity and Evolution. It completely deals with the passing of genes between different generations, details about the process of sex determination, Charles Darwin Theory to get familiar with the concept of Evolution, and many more.

Chapter 10 – Light Reflection and Refraction (प्रकाश-परावर्तन एवं अपवर्तन )

NCERT Solutions for class 10 science chapter 10 Light Reflection and Refraction illustrates the theories of reflection and refraction of light. Moreover, you will get a deeper knowledge about Image formation by plane mirror/curved mirrors and lenses. From this chapter, you can also get the knowledge about a few important topics such as:

• Reflection of light
• Power of Lens
• Image formation by spherical lenses
• Image formation by spherical mirrors
• Mirror formula and magnification
• Sign convention for reflection by spherical mirrors
• Refraction of Light
• Refraction through a rectangular glass slab
• Refractive index
• Refraction by spherical lenses
• Sign Convention for refraction by spherical lenses
• Lens Formula and Magnification

Chapter 11 – Human Eye and Colourful World (मानव-नेत्र एवं रंगबिरंगी दुनियाँ )

This chapter entirely focuses on the human eye structure and the functions which are involved in every single part of the eye. Some other concepts like various eye defects such as myopia, hypermetropia, refraction through a prism, depression of white light by a glass prism, refraction through the atmosphere, Tyndall effect, and Scattering of light are explained here as it helps students to understand how to cure people eye problems in their life.

Chapter 12 – Electricity (विद्युत )

Chapter 12 deals all about Electricity which we use in our day-to-day life. Having a better grip on all electricity concepts helps you understand the problems that you face in real life. Here in this chapter, you will learn the concepts of electric current, circuit diagram, potential difference, resistance, the combination of resistance, heating effects of current and electrical power, constituents of electricity, current flow in an electrical circuit, Ohm’s law, resistivity, Joule’s law, electric fuse, electric power.

Chapter 13 – Magnetic Effects of Electric Current (विद्युत धारा का चुम्बकीय प्रभाव )

Studying the magnetic effects of electric current is more important for students to know that Electricity and Magnetism are related phenomena. Practical applications – electromagnets, electric motor (magnetic effect of electric current), and electric generators (electric effect of moving magnets) are some of the important topics explained deeply in this chapter.

Chapter 14 – Sources of Energy (उर्जा के स्रोत )

NCERT Class 10 Science Chapter 14 Sources of Energy Solutions are explained here. The major concepts included in this chapter are as follows:

• Ideal source of energy
• Non-Conventional Sources of Energy: Solar Energy, Energy from Sea, Geothermal Energy, Nuclear Energy
• Conventional sources of energy: Fossil fuels, thermal power plants, hydro-power plants
• Renewable and non-renewable sources of energy and their availability in the long run
• Bio-Mass and wind energy as major energy resources

On the other hand, this chapter also explains different forms of energy and their sources

Chapter 15 – Our Environment (हमारा पर्यावरण )

Knowledge about the environment that we live in is a must for all human beings not only students. So, this chapter completely deals with the importance of preserving the environment, ecosystem and its components, food chain, food web, waste management, biodegradable and non-biodegradable substances, a tropic level, biotic and abiotic components, producers, consumers, ozone formations & its depletion. Besides, the chapter also explains how to manage the garbage that humans produce

Chapter 16 – Management of Natural Resources (प्राकृतिक संसाधनों का प्रबंधन)

NCERT Solutions for class 10 science chapter 16 Sustainable Management of Natural Resources covers detailed information about different natural resources, their advantages, and conservation efforts. But, primarily the chapter concentrates on the following concepts:

• Management of forests and wild-life
• Management of fossil fuels; Coal and Petroleum
• Natural resources and their management
• Water harvesting

Unit-Wise Marking Scheme of CBSE Class 10 Science Term 2 Exam (Theory)

The unit-wise marks weightage list provided here is completely based on the latest CBSE Class 10 Science exam paper:

FAQs on CBSE Class 10 Physics Chemistry Biology NCERT Solutions PDF

1. How students can find Solutions for NCERT 10th Science exercises questions online?

Students can find all chapters of NCERT solutions for class 10 science exercise questions online at NCERTBooks.Guru

2. How many chapters & what are there in the 10th NCERT Solutions Science?

NCERTBooks.Guru provided NCERT Solutions for Class 10 Science cover all the 16 textbook chapters. The list of all the chapters covered in the solutions of NCERT 10th std science are as follows:

• Chemical Reactions and Equations
• Acids, Bases, and Salts
• Metals and Non-metals
• Carbon and its Compounds
• Periodic Classification of Elements
• Life Processes
• Control and Coordination
• How do Organisms Reproduce?
• Heredity and Evolution
• Light – Reflection and Refraction
• The Human Eye and the Colorful World
• Electricity
• Magnetic Effects of Electric Current
• Sources of Energy
• Our Environment
• Sustainable Management of Natural Resources

3. Will NCERT 10th Class Solutions for Science PDFs be enough to score well in the board exam?

Yes, NCERT 10th Class Solutions for Science PDFs are enough to score high in the board exam. As it covers all chapters textbook and exercise questions with detailed solutions that clear all your doubts and improves your subject knowledge.

Students of Class 10 may also refer to the study materials like NCERT Class 10 Science Exemplar, NCERT Textbooks , NCERT 10th Science Syllabus as well as NCERT Solutions for Class 10 Science PDF at NCERTbooks.Guru for better preparation for exams. We believe this article has been helpful to you. If you have any questions, ask in the comment section below and we will get back to you at the earliest.

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• NCERT Solutions for Class 10
• NCERT Class 10 Science

NCERT Solutions Class 10 Science

Ncert solutions for class 10 science updated for 2023-24 free pdf.

NCERT Solutions Science Class 10 contains very important information that helps the students understand the complex topics and helps them in preparation for the Class 10 board examination. Studying the answers to the questions in the textbook will ensure your understanding of a particular topic and help you determine your strengths and weaknesses. These NCERT Solutions for Class 10 Science are prepared by our subject experts in such a way that the students understand all the topics covered in the syllabus of CBSE 10 Science quite effectively.

Access NCERT Solutions of Class 10 Science all chapters in PDF

The following chapters have been removed from the NCERT Class 10 Science textbook 2023-24. Periodic Classification Of Elements Sources of Energy Sustainable Management of Natural Resources

The Solutions of NCERT Books also helps students to understand the topic thoroughly, which is very important not just from the point of view of the Class 10 examination. Better understanding lays a great foundation for their future studies. Quite often,  questions from textbooks are also asked in competitive examinations. We have covered both in-text and exercise questions in detail.

NCERT Solutions Class 10 Science Book All Chapters Brief:

Chapter 1 – chemical reactions and equations.

The first chapter of Class 10 NCERT Science will teach the students about chemical reactions and how to write equations, how to conduct combination and decomposition reactions and more. In the previous classes, we have learned about physical and chemical changes in matter. Whenever a chemical change occurs, we can say that a chemical reaction has taken place. A complete chemical reaction represents the reactants, products and their physical states symbolically. Students will also study how to write a chemical reaction , which is a symbolic representation of a chemical reaction. The chapter also explains how various chemical equations can be balanced in different states.

The next subtopic teaches various chemical reactions such as Combination Reaction, Decomposition reaction, Displacement Reaction, and Double Displacement Reaction along with various examples and chemical reactions. On the basis of energy, exothermic and endothermic reactions are explained. Exothermic reactions are those reactions in which heat is given out along with the products, and endothermic reactions are those reactions in which energy is absorbed. Then redox reaction is explained, which is a combination of reduction reaction and oxidation reaction. The chapter explains all types of reactions with suitable examples with their respective chemical equations.

Topics Covered in Class 10 Science Chapter 1 Chemical Reactions and Equations :

Chemical reactions: Chemical equation, Balanced chemical equation, implications of a balanced chemical equation, types of chemical reactions: combination, decomposition, displacement, double displacement, precipitation, endothermic exothermic reactions, oxidation and reduction.

Also, access the following resources for Class 10 Chapter 1 Chemical Reactions and Equations, at BYJU’S:

• CBSE Science Notes For Class 10 Chapter 1
• Important Questions for Class 10 Science Chapter 1 – Chemical Reactions And Equations
• NCERT Exemplar Class 10 Science Solutions for Chapter 1 – Chemical Reactions And Equations

Chapter 2 – Acids, Bases and Salts

NCERT Class 10 Science Chapter 2 is all about acids, bases and salts . In previous classes, students have learned that the sour and bitter tastes of food are due to acids and bases, respectively, present in them. We all know that acids are sour in taste and change the colour of blue litmus to red, whereas, bases are bitter and change the colour of the red litmus to blue. In this chapter, we will study the reactions of acids and bases, how acids and bases cancel out each other’s effects and many more interesting things that we use in our day-to-day life. Students will get to understand the chemical properties of acids and bases, how acids and bases react with metals, how  metal carbonates and metal hydrogen carbonates react with acids, how acids and bases react with each other, reaction of metallic oxides with acids and reaction of a non-metallic oxide with base explained with suitable examples and various chemical reactions.

The chapter then explains what all acids and bases have in common with a suitable example which gives the conclusion that acid solution in water conducts electricity. Students get to learn various experiments on what happens to acid or a base in a water solution and how strong are acid or base solutions by making use of universal indication. Along with it, students will get to learn about the importance of pH in everyday life. The chapter ends with a detailed explanation of salt preparation, properties and its uses.

Topics Covered in Class 10 Science Chapter 2 Acids, Bases and Salts :

Acids, bases and salts: Their definitions in terms of furnishing of H+ and OH– ions, General properties, examples and uses, neutralization, concept of pH scale (Definition relating to logarithm not required), importance of pH in everyday life; preparation and uses of Sodium Hydroxide, Bleaching powder, Baking soda, Washing soda and Plaster of Paris.

Also, access the following resources for Class 10 Chapter 2 Acids, Bases and Salts at BYJU’S:

• Acids, Bases and Salts Class 10 Chapter 2 Notes
• Chapter 2 -Acids, Bases and Salts
• Revision Notes For Class 10 Science Chapter 2 – Acids, Bases and Salts
• NCERT Exemplar Class 10 Science Solutions for Chapter 2 – Acids Bases And Salts

Chapter 3 – Metals and Non-metals

In previous classes, students must have learned about various elements that can be classified as metals or non-metals on the basis of their properties. Here in Chapter 3 of Class 10 Science, students will learn about the physical properties of metals and non-metals . Metals are lustrous, malleable, ductile and are good conductors of heat and electricity. They are solid at room temperature, except mercury which is a liquid. The physical properties of metals are explained on various parameters such as ductility, malleability, tensile nature, strength, etc. On the basis of physical properties, metals and non-metals are differentiated. Some of the examples of non-metals are carbon, sulphur, iodine, oxygen, hydrogen, etc. The non-metals are either solids or gases except bromine which is a liquid. Under the subtopic chemical properties of metals, chemical reactions are discussed with oxygen gas, water, acids and other metal salts. The reactions and conditions depend on the reactivity series. The reactivity series tops potassium as the most reactive and gold as the least reactive.

The compounds formed in this manner by the transfer of electrons from a metal to a non-metal are known as ionic compounds or electrovalent compounds. Some of the general properties for ionic compounds are physical nature, melting and boiling points, solubility and conduction of electricity. Metal is extracted from its ore and then refining them for use is known as metallurgy. Metals are refined by using the method of electrolytic refining. The end topic explains corrosion and how it can be prevented.

Topics Covered in Class 10 Science Chapter 3 Metals and Non-metals :

Metals and nonmetals: Properties of metals and non-metals; Reactivity series; Formation and properties of ionic compounds; Basic metallurgical processes; Corrosion and its prevention.

Also, access the following resources for Class 10 Chapter 3 Metals and Non-metals, at BYJU’S:

• CBSE Class 10 Chapter 3 Metals and Non-metals Notes
• Revision Notes For Class 10 Science Chapter 3 – Metals and Non-metals
• NCERT Exemplar Class 10 Science Solutions for Chapter 3 – Metals And Non Metals

Chapter 4 – Carbon and its Compounds

In the previous chapter, we discussed compounds of importance to us. In this chapter, we will study some more interesting compounds and their properties. Also, we shall be learning about carbon, an element which is of immense significance to us in both its elemental form and in the combined form. Carbon is a versatile element that forms the basis for all living organisms and many of the things we use. Covalent bonds are formed by the sharing of electrons between two atoms so that both can achieve a completely filled outermost shell. Carbon forms covalent bonds with itself and other elements such as hydrogen, oxygen, sulphur, nitrogen and chlorine. Organic compounds are categorized into saturated and unsaturated carbon compounds. Saturated compounds are compounds with only a single bond. Unsaturated carbon compounds are compounds with a double or triple bond. The saturated compounds of carbon and hydrogen are methane, ethane, propane, butane, pentane and hexane.

The chapter also explains some of the chemical properties of carbon and its compounds such as combustion, oxidation, addition reaction, substitution reaction. Ethanol and ethanoic acid are carbon compounds of importance in our daily lives. Soap and detergents are studied with their chemical structures and properties and their difference is also discussed. Detergents are usually used to make shampoos and products for cleaning clothes.

Topics Covered in Class 10 Science Chapter 4 Carbon and its Compounds :

Carbon compounds: Covalent bonding in carbon compounds. Versatile nature of carbon. Homologous series. Nomenclature of carbon compounds containing functional groups (halogens, alcohol, ketones, aldehydes, alkanes and alkynes), difference between saturated hydro carbons and unsaturated hydrocarbons. Chemical properties of carbon compounds (combustion, oxidation, addition and substitution reaction). Ethanol and Ethanoic acid (only properties and uses), soaps and detergents.

Also, access the following resources for Class 10 Chapter 4 Carbon and its Compounds at BYJU’S:

• CBSE Class 10 Science Chapter 4 Carbon and its Compounds Notes
• NCERT Exemplar Class 10 Science Solutions for Chapter 4 – Carbon And Its Compounds

Chapter 5 – Periodic Classification of Elements

In Standard 9 we have learned that matter around us is present in the form of elements, compounds and mixtures, and the elements contain atoms of only one type. The early attempts at the classification of elements resulted in grouping the then-known elements as metals and non-metals. Dobereiner grouped the elements into triads and Newlands gave the Law of Octaves. Mendeleev arranged the elements in increasing order of their atomic masses and according to their chemical properties. He even predicted the existence of some yet-to-be-discovered elements on the basis of gaps in his Periodic table. The modern periodic table came into existence. Mendeleev’s Periodic Law was modified, and the atomic number was adopted as the basis of the Modern Periodic Table and the Modern Periodic Law can be stated as follows: ‘Properties of elements are a periodic function of their atomic number’.

In this chapter, Periodic Classification of Elements, elements in the Modern Periodic Table are arranged in 18 vertical columns called groups and 7 horizontal rows called periods. Elements thus arranged show periodicity of properties including atomic size, valency or combining capacity and metallic and non-metallic character. The valency of an element is determined by the number of valence electrons present in the outermost shell of its atom. The term atomic size refers to the radius of an atom.

Also, access the following resources for Class 10 Chapter 5 Periodic Classification of Elements at BYJU’S:

• CBSE Class 10 Chapter 5 Periodic Classification of Elements Notes
• Revision Notes For Class 10 Science Chapter 5 – Periodic Classification of Elements
• Chapter 5 – Periodic Classification of Elements
• NCERT Exemplar Class 10 Science Solutions for Chapter 5 – Periodic Classification Of Elements

Chapter 6 – Life Processes

NCERT Class 10 Science Chapter 6 explains Life Processes . There are six life processes that all living organisms perform. They are movement, respiration, growth, reproduction, excretion and nutrition. The chapter also teaches about nutrition which means the process of taking in food and using it for growth, metabolism and repair. Nutritional stages are ingestion, digestion, absorption, transport, assimilation, and excretion. Nutrition is further divided into Autotrophic Nutrition and Heterotrophic Nutrition. Autotrophic nutrition involves the intake of simple inorganic materials from the environment and using an external energy source like the Sun to synthesize complex high-energy organic material. Heterotrophic nutrition involves the intake of complex material prepared by other organisms. Different types of heterotrophic nutrition are parasitic nutrition, saprophytic nutrition and holozoic nutrition. The next topic is nutrition in human beings. The various steps of nutrition are ingestion, digestion, Oesophagus, stomach, small intestine, bile, absorption, assimilation and egestion. The next subtopic is respiration in which the human respiratory system is explained beautifully. The different elements of the human respiratory system are lungs, bronchi, larynx, pharynx, etc. During the process of respiration, organic compounds such as glucose are broken down to provide energy in the form of ATP. ATP is used to provide energy for other reactions in the cell.

Respiration may be aerobic or anaerobic. Aerobic respiration makes more energy available to the organism. For plants, the soil is the nearest and richest source of raw materials like nitrogen, phosphorus and other minerals. In human beings, the transport of materials such as oxygen, carbon dioxide, food and excretory products is a function of the circulatory system. The circulatory system consists of the heart, blood and blood vessels. In highly differentiated plants, transport of water, minerals, food and other materials is a function of the vascular tissue which consists of xylem and phloem. In human beings, excretory products in the form of soluble nitrogen compounds are removed by the nephrons in the kidneys. Plants use a variety of techniques to get rid of waste material.

Topics Covered in Class 10 Science Chapter 6 Life Processes :

Life processes: ‘Living Being’. Basic concept of nutrition, respiration, transport and excretion in plants and animals.

Also access the following resources for Class 10 Chapter 6 Life Processes at BYJU’S:

• CBSE Class 10 Science Notes Chapter 6 Life Processes
• NCERT Exemplar Class 10 Science Solutions for Chapter 6 – Life Processes

Chapter 7 – Control and Coordination

Chapter 7 of Class 10 teaches about control and coordination , which are the functions of the nervous system and hormones in our bodies. The responses of the nervous system can be classified as a reflex action, voluntary action or involuntary action. The nervous system uses electrical impulses to transmit messages. It gets information from our sense organs and acts through our muscles. Chemical coordination is seen in both plants and animals. Hormones produced in one part of an organism move to another part to achieve the desired effect. A feedback mechanism regulates the action of the hormones.

Topics Covered in Class 10 Science Chapter 7 Control and Coordination :

Control and co-ordination in animals and plants: Tropic movements in plants; Introduction of plant hormones; Control and co-ordination in animals: Nervous system; Voluntary, involuntary and reflex action; Chemical co-ordination: animal hormones.

Also, access the following resources for Class 10 Chapter 7 Control and Coordination at BYJU’S:

• CBSE Class 10 Science Chapter 7 Control and Coordination Notes
• NCERT Exemplar Class 10 Science Solutions for Chapter 7 – Control And Coordination

Chapter 8 – How do Organisms Reproduce

Unlike other life processes, reproduction is not essential to maintain the life of an individual organism. How do Organisms Reproduce chapter involves the creation of a DNA copy and additional cellular apparatus by the cell involved in the process. Depending on their body design, various organisms use different modes of reproduction. In fission, many bacteria and protozoa simply divide into two or more daughter cells. Organisms such as hydra can regenerate if they are broken into pieces. They can also give out buds which mature into new individuals. Roots, stems and leaves of some plants develop into new plants through vegetative propagation. These are examples of asexual reproduction where new generations are created from a single individual. Sexual reproduction involves two individuals for the creation of a new individual. DNA copying mechanisms create variations which are useful for ensuring the survival of the species. Modes of sexual reproduction allow for greater variation to be generated.

Reproduction in flowering plants involves the transfer of pollen grains from the anther to the stigma which is referred to as pollination. This is followed by fertilisation. Changes in the body during puberty, such as an increase in breast size in girls and new facial hair growth in boys, are signs of sexual maturation. The male reproductive system in human beings consists of testes which produce sperms, vas deferens, seminal vesicles, prostate gland, urethra and penis. The female reproductive system in human beings consists of ovaries, fallopian tubes, uterus and vagina. Sexual reproduction in human beings involves the introduction of sperm in the vagina of the female. Fertilisation occurs in the fallopian tube. Contraception to avoid pregnancy can be achieved by the use of condoms, oral pills, copper -T and other methods.

Topics Covered in Class 10 Science Chapter 8 How Do Organisms Reproduce :

Reproduction: Reproduction in animals and plants (asexual and sexual) reproductive health – need and methods of family planning. Safe sex vs HIV/AIDS. Child bearing and women’s health.

Also, access the following resources for Class 10 Chapter 8 How do Organisms Reproduce at BYJU’S:

• CBSE Class 10 Science Chapter 8 How Do Organisms Reproduce Notes
• Chapter 8 -How do Organisms Reproduce?
• NCERT Exemplar Class 10 Science Solutions for Chapter 8 – How Do Organisms Reproduce

Chapter 9 – Heredity And Evolution

In this chapter, we will learn about Heredity and Evolution . We have seen that reproductive processes give rise to new individuals that are similar, but subtly different. We have discussed how some amount of variation is produced even during asexual reproduction. The Rules for the Inheritance of Traits in human beings relate to the fact that both the father and the mother contribute practically equal amounts of genetic material to the child. This means that each trait can be influenced by both paternal and maternal DNA. Sex can be determined by different factors in various species. Changes in the non-reproductive tissues caused by environmental factors are not inheritable. Speciation may take place when the variation is combined with geographical isolation. Evolutionary relationships are traced in the classification of organisms. Tracing common ancestors back in time leads us to the idea that at some point in time, non-living material must have given rise to life.

Evolution can be worked out by the study of not just living species, but also fossils. Complex organs may have evolved because of the survival advantage of even the intermediate stages. Organs or features may be adapted to new functions during the course of evolution. Evolution cannot be said to progress from lower forms to higher forms. Rather, evolution seems to have given rise to more complex body designs even while the simpler body designs continue to flourish. Study of the evolution of human beings indicates that all of us belong to a single species that evolved in Africa and spread across the world in stages.

Topics Covered in Class 10 Science Chapter 9 Heredity and Evolution :

Heredity and Evolution: Heredity; Mendel’s contribution – Laws for inheritance of traits: Sex determination: brief introduction: (topics excluded – evolution; evolution and classification and evolution should not be equated with progress).

Also, access the following resources for Class 10 Chapter 9 Heredity and Evolution, at BYJU’S:

• CBSE Class 10 Science Chapter 9 Heredity And Evolution Notes
• NCERT Exemplar Class 10 Science Solutions for Chapter 9 – Heredity And Evolution

Chapter 10 – Light Reflection and Refraction

In  NCERT Class 10 Science Chapter 10, we will study the phenomena of reflection and refraction of light using the straight-line propagation of light. These basic concepts will help us in the study of some of the optical phenomena in nature. The chapter also discusses the reflection of light by spherical mirrors and refraction of light and their application in real life. Light is a source of energy which generates a sensation of vision in human beings. Light seems to travel in straight lines. The different types of a spherical mirror, convex and concave are taught. The various terms related to spherical mirrors like the centre of curvature, the radius of curvature, etc., focus, pole, etc. are discussed with ray diagrams. Uses of a spherical mirror are also discussed in this chapter. Mirror formula gives the relationship between the object-distance, image-distance, and focal length of a spherical mirror. The focal length of a spherical mirror is equal to half its radius of curvature.

Refraction is the bending of a wave when it enters a medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light rays toward the normal to the boundary between the two media. The phenomena of refraction can be understood easily by the concepts of the refractive index and optical density. The refractive index of a transparent medium is the ratio of the speed of light in a vacuum to that in the medium. In case of a rectangular glass slab, the refraction takes place at both the air-glass interface and glass-air interface. The emergent ray is parallel to the direction of the incident ray. Lens formula gives the relationship between the object-distance, image-distance, and the focal length of a spherical lens. Power of a lens is the reciprocal of its focal length. The SI unit of power of a lens is dioptre.

Topics Covered in Class 10 Science Chapter 10 Light Reflection and Refraction :

Reflection of light by curved surfaces; Images formed by spherical mirrors, centre of curvature, principal axis, principal focus, focal length, mirror formula (Derivation not required),magnification. Refraction; Laws of refraction, refractive index. Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula(Derivation not required); Magnification. Power of a lens.

Also, access the following resources for Class 10 Chapter 10 Light Reflection and Refraction at BYJU’S:

• CBSE Class 10 Science Chapter 10 Light – Reflection and Refraction Notes
• Chapter 10 -Light: Reflection and Refraction
• NCERT Exemplar Class 10 Science Solutions for Chapter 10 – Light Reflection And Refraction

Chapter 11 – The Human Eye and Colorful World

In the previous chapter, we learnt about light and some of its properties. In this chapter, we will study some of the optical phenomena in nature. The chapter also discusses the rainbow formation, splitting of white light and blue colour of the sky. The human eye is one of the most valuable and sensitive sense organs. It enables us to see the wonderful world and the colours around us. The ability of the eye to focus on both near and distant objects, by adjusting its focal length, is called the accommodation of the eye. The smallest distance, at which the eye can see objects clearly without strain, is called the near point of the eye or the least distance of distinct vision. For a young adult with normal vision, it is about 25cm. The common refractive defects of vision include myopia, hypermetropia and presbyopia. Myopia, short-sightedness-the image of distant objects is focused before the retina is corrected by using a concave lens of suitable power. Hypermetropia (far-sightedness-the image of nearby objects is focussed beyond the retina) is corrected by using a convex lens of suitable power. The eye loses its power of accommodation at old age. The splitting of white light into its component colours is called dispersion. Scattering of light causes the blue colour of the sky and the reddening of the Sun at sunrise and sunset.

Topics Covered in Class 10 Science Chapter 11 The Human Eye and Colorful World :

Functioning of a lens in human eye, defects of vision and their corrections, applications of spherical mirrors and lenses. Refraction of light through a prism, dispersion of light, scattering of light, applications in daily life (excluding colour of the sun at sunrise and sunset).

Also, access the following resources for Class 10 Chapter 11 The Human Eye and Colorful World, at BYJU’S:

• CBSE Class 10 Science Chapter 11 The Human Eye and the Colourful World Notes
• NCERT Exemplar Class 10 Science Solutions for Chapter 11 – Human Eye And Colourful World

Chapter 12 – Electricity

Electricity has an important place in modern society. It is a controllable and convenient form of energy for a variety of uses in homes, schools, hospitals, industries and so on. It is a phenomenon related to the flow of charge. A stream of electrons moving through a conductor constitutes an electric current. Conventionally, the direction of current is taken opposite to the direction of flow of electrons. The SI unit of electric current is ampere. To set the electrons in motion in an electric circuit, we use a cell or a battery. A cell generates a potential difference across its terminals. It is measured in volts (V). Resistance is a property that resists the flow of electrons in a conductor. It controls the magnitude of the current. The SI unit of resistance is Ohm. Ohm’s law: the potential difference across the ends of a resistor is directly proportional to the current through it, provided its temperature remains the same. The resistance of a conductor depends directly on its length, inversely on its areas of cross-section, and also on the material of the conductor. The equivalent resistance of several resistors in series is equal to the sum of their individual resistances. The electrical energy dissipated in a resistor is given by W=V x I x t. The unit of power is watt (W). One watt of power is consumed when 1 A of current flows at a potential difference of 1 V. The commercial unit of electrical energy is kilowatt-hour (kWh). 1kW h = 3,6000,000 J = 3.6 x 10 6 J.

Topics Covered in Class 10 Science Chapter 12 Electricity :

Electric current, potential difference and electric current. Ohm’s law; Resistance, Resistivity, Factors on which the resistance of a conductor depends. Series combination of resistors, parallel combination of resistors and its applications in daily life. Heating effect of electric current and its applications in daily life. Electric power, Interrelation between P, V, I and R.

Also, access the following resources for Class 10 Chapter 12 Electricity at BYJU’S:

• Electricity Class 10 Notes
• NCERT Exemplar Class 10 Science Solutions for Chapter 12 – Electricity

Chapter 13 – Magnetic Effects of Electric Current

In this chapter, students will study magnetic fields and such electromagnetic effects, along with electromagnets and electric motors, which involve the magnetic effect of electric current, and electric generators, which involve the electric effect of moving magnets. A compass needle is a small magnet. Its one end, which points towards the north, is called a north pole, and the other hand, which points towards the south, is called a south pole. A magnetic field exists in the region surrounding a magnet in which the force of the magnet can be detected. Field lines are used to represent a magnetic field. A field line is a path along which a hypothetical free north pole would tend to move. The direction of the magnetic field at a point is given by the direction that a north pole placed at that point would take. Field lines are shown closer together where the magnetic field is greater. A metallic wire carrying an electric current has associated with it a magnetic field. The field lines about the wire consist of a series of concentric circles whose direction is given by the right-hand rule. The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape of the conductor. The magnetic field of a solenoid carrying a current is similar to that of a bar magnet. An electromagnet consists of a core of soft iron wrapped around a coil of insulated copper wire. A current-carrying conductor, when placed in a magnetic field, experiences a force. If the direction of the field and that of the current are mutually perpendicular to each other, then the force acting on the conductor will be perpendicular to both and will be given by Fleming’s left-hand rule. This is the basis of an electric motor. An electric motor is a device that converts electric energy into mechanical energy.

The phenomenon of electromagnetic induction is the production of induced current in a coil placed in a region where the magnetic field changes with time. The magnetic field may change due to relative motion between the coil and a magnet placed near to the coil. If the coil is placed near a current-carrying conductor, the magnetic field may change either due to a change in the current through the conductor or due to the relative motion between the coil and conductor, the magnetic field may change either due to a change in the current through the conductor or due to the relative motion between the coil and the conductor. The direction of the induced current is given by Fleming’s right-hand rule. A generator converts mechanical energy into electrical energy. It works on the basis of electromagnetic induction. There are 2 types of generator AC and DC generator. Fuse is the most important safety device, used for protecting the circuits due to short-circuiting or overloading of the circuits.

Topics Covered in Class 10 Science Chapter 13 Magnetic Effects of Electric Current:

Magnetic effects of current: Magnetic field, field lines, field due to a current carrying conductor, field due to current carrying coil or solenoid; Force on current carrying conductor, Fleming’s Left Hand Rule, Direct current. Alternating current: frequency of AC. Advantage of AC over DC. Domestic electric circuits.

Also, access the following resources for Class 10 Chapter 13 Magnetic Effects of Electric Current at BYJU’S:

• CBSE Class 10 Science Chapter 13 Magnetic Effects of Electric Current Notes
• Revision Notes For Class 10 Science Chapter 13 – Magnetic Effects of Electric Current
• NCERT Exemplar Class 10 Science Solutions for Chapter 13 – Magnetic Effects Of Electric Current

Chapter 14 – Sources of Energy

Our energy requirements increase with our standard of living. In order to fulfil our energy requirements, we try to improve the efficiency of energy usage and also try and exploit new sources of energy. The chapter discusses different sources of energy, and they are conventional sources of energy, which we keep on using for many years. It includes fossil fuels, thermal power plants and hydropower plants. The advantages and disadvantages are also discussed. After those improvements in the technology for using conventional sources of energy is also discussed such as Biomass and wind energy. Next, students will study the topic of alternative or non-conventional energy resources. It includes solar energy, in which energy is generated through the solar cell and solar panel. Energy can be generated from the sea, such as Tidal energy, wave energy and ocean thermal energy. Energy can also be generated from the earth’s crust, known as geothermal energy . Nuclear energy is energy in the nucleus (core) of an atom. The energy source we select would depend on factors like the ease and cost of extracting energy from the source, the efficiency of the technology available for using that source of energy and the environmental impact of using that source. Many of the sources ultimately derive their energy from the Sun. All the topics are explained with the advantages and disadvantages of it.

Also, access the following resources for Class 10 Chapter 14 Sources of Energy at BYJU’S:

• CBSE Class 10 Science Chapter 14 Sources of Energy Notes
• NCERT Exemplar Class 10 Science Solutions for Chapter 14 – Sources Of Energy

Chapter 15 – Our Environment

This chapter discusses how various components in the environment interact with each other and how we impact the environment. The various components of an ecosystem are interdependent. The producers make the energy from sunlight available to the rest of the ecosystem. There is a loss of energy as we go from one trophic level to the next, this limits the number of trophic levels in a food chain. The food-chain is explained in detail with examples according to nature, such as in the forest, in grassland and in the pond. Human activities have an impact on the environment. The use of chemicals like CFCs has endangered the ozone layer. Since the ozone layer protects against the ultraviolet radiation from the Sun, this could damage the environment. The waste we generate may be biodegradable or non-biodegradable . The disposal of the waste we generate is causing serious environmental problems.

Topics Covered in Class 10 Science Chapter 15 Our Environment :

Our environment: Eco-system, Environmental problems, Ozone depletion, waste production and their solutions. Biodegradable and non-biodegradable substances.

Also, access the following resources for Class 10 Chapter 15 Our Environment at BYJU’S:

• CBSE Class 10 Chapter 15 Our Environment Notes
• Revision Notes For Class 10 Science Chapter 15 – Our Environment
• Chapter 15 -Our Environment
• NCERT Exemplar Class 10 Science Solutions for Chapter 15 – Our Environment

Chapter 16 – Sustainable Management of Natural Resources

In the previous class, we have learned about some natural resources like soil, air and water and how various components are cycled over and over again in nature. In this chapter, we will look at some of our resources and how we are using them. Our resources, like forests, wildlife, water, coal and petroleum, need to be used in a sustainable manner. We can reduce pressure on the environment by sincerely applying the maxim of ‘Refuse, Reduce, Reuse, Repurpose and Recycle’ in our lives. Management of forest resources has to take into account the interests of various stakeholders. The harnessing of water resources by building dams has social, economic and environmental implications. Alternatives to large dams exist. These are locale-specific and may be developed so as to give local people control over their local resources. The fossil fuels, coal and petroleum, will ultimately be exhausted. Owing to this and because their combustion pollutes our environment, we need to use these resources judiciously.

Also, access the following resources for Class 10 Chapter 16 Sustainable Management of Natural Resources at BYJU’S:

• CBSE Class 10 Science Chapter 16 Sustainable Management of Natural Resources Notes
• Revision Notes For Class 10 Science Chapter 16 – Sustainable Management of Natural Resources
• NCERT Exemplar Class 10 Science Solutions for Chapter 16 – Management Of Natural Resources

CBSE Class 10 Science Evaluation Scheme (Theory) –

How NCERT Solutions Class 10 Science is helpful while preparing for the exam?

Class 10 Science is an important subject for those students who want to pursue their future studies in this field. To score good marks in this subject, students need to follow the NCERT textbook of Class 10 Science and should be thorough with it. For each chapter, there will be exercise questions for practice which students need to write after they finish completing each topic. It will help them to revise the topics and get to know how much they have understood the concepts. After completing the exercise question, they can refer to the NCERT Solutions of Class 10 Science to cross-check whether they answered all the questions correctly. These solutions work as a guide for the students so that they don’t repeat the mistakes and make sure they answer all the questions correctly.

Preparing for the Class 10 exam needs a lot of attention and commitment as it is considered the turning point of the educational journey. Students need to have an overall understanding of individual chapters, and the process of it demands hard work towards studies and an effective approach to getting through the solutions. A significant role is played by Class 10 NCERT Science Solutions, which helps them to prepare effectively for their Class 10 board exams.

These solutions are based on the CBSE syllabus of Class 10 Science, which provides solutions to all the exercise questions of each chapter mentioned in the NCERT textbook of Class 10 Science. By referring to the solutions, students get to know which topic to focus more upon which will help students to learn faster. Students must know the right technique to answer all the questions given in the NCERT textbook of Class 10 Science . So, in order to help them prepare for their exams, we have provided all the chapter-wise NCERT Solutions. Students can also refer to the NCERT Workbook Solutions Class 10 Science for their further preparation.

Features of NCERT Class 10 Science Solutions

NCERT Science Solutions Class 10 is the best resource study material for students as it delivers a wide range of solutions to all the NCERT questions in the syllabus. It gives detailed solutions to the three dimensions of science, which are Physics, Chemistry and Biology. With the help of the solutions, students can instantly solve their doubts. These solutions are designed as per the NCERT curriculum to help students prepare for their Class 10 board exam. Some of the features of NCERT Solutions of Class 10 Science  are mentioned below:

• The solutions are solved in easy-to-understand language so that students don’t get confused while referring to them.
• The answers are explained elaborately for all the exercise questions mentioned in each chapter.
• Solving these solutions will help students to solve the sample papers as well as the previous year question papers.
• It boosts the student’s confidence level and also helps them work on their weak points.
• All the answers are explained with proper diagrams related to the question.

Other NCERT Resources for Class 10 Science

Students of Class 10 should refer to other study materials like NCERT Class 10 Science Exemplar, NCERT Class 10 Science textbook, and NCERT Class 10 Science Syllabus besides studying from NCERT Class 10 Science Solutions. These study materials are also prepared as per the CBSE Class 10 science syllabus and help them while preparing for the board exams. Students can refer to these study materials after they complete the entire syllabus, which will help in quick revision before the exam.

Below we have provided the links of the other NCERT Resources for Class 10 Science to help you prepare effectively for the Class 10 board exam.

Download NCERT Solutions Class 10 Science Book APP

Students of Class 10 can download the NCERT Class 10 chapter-wise Science solutions from the BYJU’S app, which will help them while preparing for their exam. Apart from the NCERT Solutions for Class 10 , students can also utilize the BYJU’S App for other study materials such as previous year question papers, syllabus, important questions, etc. The BYJU’S App will make your learning easier as you can access it from anywhere you want, by downloading it on your smart device. The solutions of NCERT Class 10 Science are prepared by our highly experienced subject experts, as per the latest CBSE Class 10 Science syllabus.

Frequently Asked Questions on NCERT Solutions for Class 10 Science

What are the chapters present in the ncert solutions for class 10 science , will the questions in the board exam appear from ncert solutions for class 10 science , is the ncert solutions for class 10 science pdfs enough to score well in the board exam, which are the important chapters in the ncert solutions for class 10 science , leave a comment cancel reply.

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Saturday, August 28, 2021

10th science unit 2 assignment answer key english medium - july month.

• 10th Science Assignment Question paper -  PDF - Download - July month - Tamil Medium
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Class-10 Subject: SCIENCE

UNIT – VII- Atoms and Molecules

I.One Mark Questions

1. Number of electrons, protons and neutrons present in 17Cl35, 17Cl37 is-

--------------

a) 17e¯ , 17p+, 17n

 17e¯ , 17p+, 19n

b) 18e¯ , 18p+, 17n

 17e¯ , 20p+, 19n

c) 17e¯ , 17p+, 18n

 17e¯ , 17p+, 20n

d) 18e¯ , 17p+, 18n

20e¯ , 20p+, 17n

2. Isobars are defined as---------

a) Elements show same atomic number with different mass number

b) Elements show same mass number with different atomic number

c) Elements show same valency

d) None of these

3. The Atomicity of Glucose molecule is ________.

a) 6       b) 12       c)24        d) 18

4. The mass of 5 moles of sodium is -------------

a) 46g b) 34g c) 105g d) 115g

5. Number of atoms present in 3 moles of iron is--------

a) 6.023 x 1023 b) 18.069 x 1023 c) 12.046 x 1023

 d) None

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Part – B

II. Short Answer.

6. Define : Relative atomic mass

• Relative atomic mass of an element is the ratio between the average mass of its isotopes to 1 / 12th part of the mass of a carbon – 12 atom. It is denoted as Ar.
•  Relative atomic mass =  Average mass of the isotopes of the element / 1/12th  of the mass of one Carbon- 12 atom

7. Give any two examples for heteroatomic molecules

• Heterodiatomic molecules.

8. Calculate the number of moles in 46 g of Sodium?

9.Calculate the mass of the5×1023molecules of Glucose.

10.Calculate the number of molecules in 11.2 litre of CO2 at S.T.P.

Part – C

III. Write in detail.

1. Give the salient features of “Modern Atomic Theory”.

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 10th std Science assignment Answer key,10th Science unit 2 Assignment Answer key , 10th

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Class 10 Science Assignments

We have provided below free printable Class 10 Science Assignments for Download in PDF. The Assignments have been designed based on the latest NCERT Book for Class 10 Science . These Assignments for Grade 10 Science cover all important topics which can come in your standard 10 tests and examinations. Free printable Assignments for CBSE Class 10 Science , school and class assignments, and practice test papers have been designed by our highly experienced class 10 faculty. You can free download CBSE NCERT printable Assignments for Science Class 10 with solutions and answers. All Assignments and test sheets have been prepared by expert teachers as per the latest Syllabus in Science Class 10. Students can click on the links below and download all Pdf Assignments for Science class 10 for free. All latest Kendriya Vidyalaya Class 10 Science Assignments with Answers and test papers are given below.

Science Class 10 Assignments Pdf Download

We have provided below the biggest collection of free CBSE NCERT KVS Assignments for Class 10 Science . Students and teachers can download and save all free Science assignments in Pdf for grade 10th. Our expert faculty have covered Class 10 important questions and answers for Science as per the latest syllabus for the current academic year. All test papers and question banks for Class 10 Science and CBSE Assignments for Science Class 10 will be really helpful for standard 10th students to prepare for the class tests and school examinations. Class 10th students can easily free download in Pdf all printable practice worksheets given below.

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• As we have the best and largest collection of Science assignments for Grade 10, you will be able to easily get full list of solved important questions which can come in your examinations.
• Students will be able to go through all important and critical topics given in your CBSE Science textbooks for Class 10 .
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• Class 10 Students studying in per CBSE, NCERT and KVS schools will be able to free download all Science chapter wise worksheets and assignments for free in Pdf
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10th Science - Physics Assignment Answers 2021

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• 10th Science Assignment Answer Key TM | TN SCERT

  Assignment

• Subject: Science | Physics
• UNIT-1 Laws of motion

Part – A

I. Choose the correct answer

1. Inertia of a body depends on--------------

a) Weight of the object 

b) acceleration due to gravity 

c) mass of the object

d) Both a and b

Ans:   c) mass of the object

2. In a rocket, a large volume of gases produced by the combustion of fuel is allowed to escape through its tail nozzle in the downward direction with the tremendous speed and makes the rocket to move upward. Which principle is followed in this take off of the rocket?

a) Moment of inertia 

b) Conservation of momentum 

c) Newton’s first law of motion 

d) Newton’s law of gravitation

3. There are two statements

A) Newton’s first law is valid from the pilot in an aircraft which is taking off

B) Newton’s first law is valid from the observer in a train moving with constant velocity Which of the following is correct?

  a) A only 

b) B only 

c ) Both A and B

d) Both A and B wrong

  4. Which of the following law is used to discover new stars and planets?

  a) Newton's first law

b) Newton's second law 

c) Newton's third law 

d) Newton's law of gravitation

5. The Resultant force of two equal parallel forces acting in opposite direction in the same line of action is

a) Fnet = F1 + F2 

b) Fnet = F2-F1 

c) Fnet = F2+F1 

Part – B

  II. Short Answer

11. Define Inertia. Give its classification

The inherent property of a body to resist any change in its state of rest or the state of uniform motion, unless it is influenced upon by an external unbalanced force, is known as ‘inertia’.

Classifications:

• Inertia of rest
• Inertia of motion
• Inertia of direction

  12. If a 5N and a 15N forces are acting opposite to one another. Find the resultant force and the direction of action of the resultant force.

13. State Newton’s second law.

The force acting on a body is directly proportional to the rate of change of linear momentum of the body and the change in momentum takes place in the direction of the force.

Part – C

III. Write in Detail

18. What are the types of Inertia? Give an example for each type

Types of Inertia:

• Inertia of rest: The resistance of a body to change its state of rest is called inertia of rest.

E.g.: When you vigorously shake the branches of a tree, some of the leaves and fruits are detached and they fall down (Inertia of rest).

• The inertia of motion: The resistance of a body to change its state of motion is called inertia of motion.

E.g.: An athlete runs some distance before jumping. Because this will help him jump longer and higher. (Inertia of motion)

• Inertia of direction: The resistance of a body to change its direction of motion is called inertia of direction.

E.g.: When you make a sharp turn while driving a car, you tend to lean sideways, (Inertia of direction).

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10th Science English Medium 2nd Assignment July 2021 Answerkey

10th Science English Medium 2nd Assignment July 2021 Answerkey:- To help 10th class Tamil Nadu students we provide answerkey for the 10th science English medium 2nd assignment answer key here.we also have Tamil medium science 2nd assignment on another page

Assignment Class-10 Subject: SCIENCE UNIT – VII- Atoms and Molecules Part – A I.One Mark Questions

1. number of electrons, protons and neutrons present in 17cl35, 17cl37 is……………..

a) 17e ̄ , 17p+, 17n 17e ̄ , 17p+, 19n b) 18e ̄ , 18p+, 17n 17e ̄ , 20p+, 19n c) 17e ̄ , 17p+, 18n 17e ̄ , 17p+, 20n d) 18e ̄ , 17p+, 18n 20e ̄ , 20p+, 17n

Answer:- a) 17e ̄ , 17p+, 17n 17e ̄ , 17p+, 19n

2. Isobars are defined as………..

a) Elements show same atomic number with different mass number b) Elements show same mass number with different atomic number c) Elements show same valency d) None of these

Answer:- b) Elements show same mass number with different atomic number

3.The Atomicity of Glucose molecule is………………..

Answer:- c)24

4.The mass of 5 moles of sodium is……….

Answer:- d) 115g

5.Number of atoms present in 3 moles of iron is——–

a) 6.023 x 1023

b) 18.069 x 1023

c) 12.046 x 1023

Answer:- b) 18.069 x 1023

Part – B II. Short Answer.

6.define : relative atomic mass, 7.give any two examples for heteroatomic molecules.

HI, HCl, CO, HBr, HF.

8.Calculate the number of moles in 46 g of Sodium?

Formula to calculate the no. of moles:

No of moles = known mass of a substance/ molar mass of the substance.

No. of moles of Na= 46 / 23

                            =  2 moles

So in 46 grams, 2 moles of Na are present.

9.Calculate the mass of the 5×10 23 molecules of Glucose.

10.calculate the number of molecules in 11.2 litre of co 2 at s.t.p., part – c iii. write in detail., 1.give the salient features of “modern atomic theory”..

The salient features of “Modem atomic theory” are,

• An atom is no longer indivisible.
• Atoms of the same element may have different atomic mass.
• Atoms of different elements may have the same atomic masses.
• Atoms of one element can be transmuted into atoms of other elements. In other words, an atom is no longer indestructible.
• Atoms may not always combine in a simple whole-number ratio.
• Atom is the smallest particle that takes part in a chemical reaction.
• The mass of an atom can be converted into energy [E = mc 2 ].

Assignment Class-10 Subject:SCIENCE UNIT – XII Plant Anatomy and Plant Physiology Part – A I. OneMark Questions

1.who is the father of plant anatomy.

b) Nehemiah Grew

c) Melvin Calvin

d) C.N.R.Rao

Answer : b) Nehemiah Grew

2.The group of cells which are similar or dissimilar in structure and origin that perform similar function is called

a) Organ System

b) Vascular Bundles

d) Pericycle

Answer : c) Tissues

3.The pores present in Epidermis are called

c) Trichome

Answer : a) Stomata

4.Xylem and Phloem are present in different radii of ———-

Answer : a) root (Xylem and phloem are arranged in an alternate matter or different radii are called Radial vascular bundle. Eg: roots)

5.If xylem and phloem lie on the same radii that vascular bundle is…..

a) radial bundle

b) conjoint bundle

c) concentric and amphivasal

d) amphicribral

Answer : b) conjoint bundle

1.What are tissues?

2.classify the types of plant tissues..

Merismatic tissue and permanent tissue

3.What are the functions of Dermal or Epidremal tissue system?

• Epidermis protects the inner tissues.
• Stomata helps in transpiration.
• Root hairs help in absorption of water and minerals.

4.Write a short note about vascular bundle of Dicot root.

5.what is radial vascular bundle give example..

Radial vascular bundle: Xylem and phloem are arranged in an alternate matter or different radii are called Radial vascular bundles. Eg: roots

6.a)Differentiate the following Monocot root and Dicot root

b) Draw a neat labelled diagram of Radial vascular bundle

Assignment 2 science

Please give all the assignment in clear and neet it is conference us please send it neet all the subject

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August 11, 2021

10th social science assignment answer key 2021 - unit-1 history.

• Subject: Social Science | History 
• Unit 1 - 
• 10th Social science assignment unit 1 - PDF Download -TM

Part- A  

I. 1 Mark Questions :        

3. What were the three major empires shattered by the end of First World War?

(a) Germany, Austria Hungary, and the Ottomans

(b) Germany, Austria-Hungary, and Russia

(c) Spain, Portugal and Italy

(d) Germany, Austria-Hungary, Italy

5. Who said “imperialism is the highest stage of capitalism”?

(c) Sun Yat-sen

(d) Mao Tsetung

II Very Short Answers

6. Name the countries in the Triple Entente.

• Britain, France and Russia.

7. What were the three militant forms of nationalism in Europe?

• The three militant forms of nationalism were, England’s Jingoism, France’s Chauvinism and Germany’s Kultur.
• Trench warfare is a type of land warfare using occupied fighting lines consisting largely of military trenches, in which troops are well-protected from the enemy’s small arms fire and are substantially sheltered from artillery. It is a warfare in which opposing armed forces attack, counterattack, and defend from relatively permanent systems of trenches dug in the ground.

  Part - c 

Iii short answers.

9. Discuss the main causes of the First World War.

• The causes of the First World War are given below:
• Formation of European alliances and counter alliances
• Emergence of violent forms of nationalism in countries like England, France and Germany
• Aggressive attitude of the German Emperor Kaiser Wilhelm II
• Hostility of France towards Germany
• Opportunity for imperial power politics in the Balkans
• The Balkans wars
• Immediate cause which included the assassination of Archduke Franz Ferdinand, nephew and heir to Franz Joseph, Emperor of Austria-Hungary, by Princip, a Bosnian Serb, on 28 June 1914.

10. Explain the course of the Russian Revolution under the leadership of Lenin.

• Lenin was in Switzerland when the revolution broke out in Russia. He wanted to continued revolution.
• His slogan of “All power to the Soviets” soon won over the workers’ leaders. Devastated by war time shortages, the people were attracted by the slogan of ‘Bread, Peace and Land’.
• In October Lenin persuaded the Bolshevik Central Committee to decide on immediate revolution. Trotsky prepared a detailed plan
• On 7 November the key government buildings, including the Winter Palace, the Prime Minister’s headquarters, were seized by armed factory workers and revolutionary troops
• On 8 November 1917a new Communist government was in office in Russia. Its head this time was Lenin. The Bolshevik Party was renamed the Russian Communist Party.

 IV Answer The Following in Detail

12. Highlight the provisions of the Treaty of Versailles relating to Germany.

• All the central powers were directed to pay war indemnity especially Germany was to pay heavy amount for the losses suffered.
• Germany had to pay 6,600 million pounds as per the Reparation Commission, but can be paid in installments.
• The Germans should not have submarines and airforce, but can have a small navy and an army of one lakh men.
• Austria and Germany separated and Austria was given independence.
• All German colonies came under the mandated territories of League of nations.
• Germany had to give up all her overseas possessions, rights and titles to the allies.
• Germany surrendered Alsace-Lorraine to France.
• She signed the Treaty of Brest-Litovsk with Russia and the treaty of Bucharest with Bulgaria.
• Rhineland was to be occupied by the allies. East of Rhineland area was to be demilitarised.
• Poland was recreated with a corridor to Baltic containing the port of Danzig of Germany. 

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