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NCERT Solutions for Class 10 Science Chapter 14 - Sources Of Energy

Last updated date: 27th Jun 2024
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NCERT Solutions for Class 10 Science Chapter 14 - Sources of Energy - Free PDF Download

Sources of Energy Class 10 NCERT solutions provided include all the questions along with the detailed solutions to aid students to secure a good percentage. These solutions will not only help students with their academic exams but will also help in preparing for competitive exams like Olympiads. Vedantu is a platform that provides free NCERT Solutions and other study materials for students. Maths Students who are looking for better solutions, they can download Class 10 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations. Having a strong knowledge of the NCERT class 10 science chapter 14 solutions will also help students who are planning to opt for the science stream in class 11th and 12th.


NCERT Solutions for Class 10


Class 10 Science

Chapter Name:

Chapter 14 - Sources Of Energy


Text, Videos, Images and PDF Format

Academic Year:



English and Hindi

Available Materials:

  • Chapter Wise

  • Exercise Wise

Other Materials

  • Important Questions

  • Revision Notes

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Competitive Exams after 12th Science

Access NCERT Solutions Class-10 for science Chapter 14 - Sources of Energy

Intext Exercise 1 

1. What is a good source of energy?

Ans: A good energy source is one that can: 

  • produce a lot of heat per unit mass.

  • Has the ability to perform a substantial amount of work per unit of mass.

  • Has the potential to be easily accessible.

  • It's simple to transport and store.

  • Is cost-effective.

  • emits a small amount of smoke.

2. What is a good fuel?

Ans: A good fuel is one that generates a lot of heat when burned, creates little smoke, and is readily available.

3. If you could use any source of energy for heating your food, which one would you use and why?

Ans: Natural gas has the following properties that make it suitable for heating and preparing food:

  • It is a renewable energy source.

  • When burned, it does not emit a lot of smoke.

  • Despite being very combustible, it is simple to use and transport.

  • It also produces a lot of heat when it's burning.

Intext Exercise 2

1. What are the disadvantages of fossil fuels?

Ans: The following are some of the downsides of fossil fuels: 

  • Coal and petroleum combustion produce a lot of pollutants, which pollute the air.

  • Fossil fuels emit carbon, nitrogen, sulphur, and other oxides that generate acid rain, which has an impact on soil fertility and potable water.

  • The combustion of fossil fuels emits gases such as carbon dioxide, which contribute to global warming.

2. Why are we looking at alternate sources of energy

Ans: Non-renewable energy sources include fossil fuels, which have long been used by humans as a source of energy. These energy sources are finite and cannot be replenished individually. They're being devoured at breakneck speed. If current consumption trends continue, the Earth's fossil fuel reserves will be depleted.

As a result, we must conserve energy sources. As a result, we must seek out alternative energy sources.

3. How has the traditional use of wind and water energy been modified for our convenience?

Ans: Waterfalls were formerly employed as a source of potential energy that was transformed into power using turbines. Due to the scarcity of waterfalls, a large number of water dams have been built. Hydro-dams are now commonly employed to harness the potential energy of stored water. Water flows from a height on the turbine, which generates energy, in water dams. Windmills were once used to capture wind energy and use it to perform mechanical tasks such as lifting/drawing water from a well. Windmills, on the other hand, are now utilised to generate electricity. The kinetic energy of the wind is harnessed and turned into electricity in windmills. The turbine of the electric generator is turned by the rotatory action of the blades.

Intext Exercise 3

1. What kind of mirror − concave, convex or plain − would be best suited for use in a solar cooker? Why?

Ans: A solar cooker cooks and heats food by utilising the heat of the sun. A mirror is used in a solar cooker to reflect and focus sunlight at a specific point. In a solar cooker, a concave mirror is commonly employed for this purpose. Because the mirror concentrates all of the incident sunlight at one area, the temperature at that point rises, cooking and heating the food placed there.

2. What are the limitations of the energy that can be obtained from the oceans?

Ans: Tidal energy, wave energy, and ocean thermal energy are some of the numerous types of energy that can be obtained from the water. There are various constraints that must be overcome in order to harness these energy.

(i) Tidal energy is dependent on the Earth's, moon's, and Sun's relative positions.

(ii) To transform tidal energy into power, high dams must be built.

(iii) Using wave energy to generate power.

Extremely powerful waves are required.

(iv) To effectively harness ocean thermal energy, the temperature difference between surface water (hot) and deep water (cold) must be at least 20°C.

3. What is geothermal energy?

Ans: Geothermal energy is the earth's heat energy. Geothermal power plants use the Earth's heat to generate electricity. The molten materials existing in the earth's core are forced to the earth's crust as geological processes occur. This causes hotspots to form. When underground water comes into touch with these hot sites, steam is produced, resulting in the formation of hot springs. In geothermal power plants, this trapped steam is used to generate energy.

4. What are the advantages of nuclear energy?

Ans: The following are some of the benefits of nuclear energy:

(a) There is a tremendous quantity of energy created per unit mass.

(b) It produces no smoke and is a non-polluting energy source.

(c) The energy released by fissioning one atom of uranium is 10 million times that generated by burning one atom of carbon.

(d) The fusion of four hydrogen atoms generates a substantial quantity of energy, roughly equal to 27 MeV.

Intext Exercise 4 

1. Can any source of energy be pollution-free? Why or why not?

Ans: No, no energy source can be pollution-free. Solar cells are believed to be pollution-free. However, even creating them has a negative impact on the environment. In the case of nuclear energy, there is no waste generated following the fusion reaction. However, it is not fully pollution-free. The fusion reaction requires a temperature of around 107 K, which is provided by the fission reactions. The byproducts produced by fission processes are extremely hazardous. As a result, no energy source is pollution-free.

2. Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?

Ans: Hydrogen gas is less polluting than compressed natural gas (CNG). Hydrocarbons are used to make CNG. As a result, it contains carbon. A form of CNG pollutant is carbon. Hydrogen, on the other hand, produces no waste. There is no waste produced by hydrogen fusion. As a result, hydrogen is more environmentally friendly than CNG.

Intext Exercise 5 

1.Name two energy sources that you would consider to be renewable. Give reasons for your choices.

Ans: The following are two renewable energy sources:

  • Sun: Solar energy is the energy derived from the Sun. Fusion of hydrogen into helium, helium into other heavy elements, and other processes provide solar energy. The Sun has a considerable amount of hydrogen and helium.

As a result, solar energy may be regenerated on its own. The Sun will continue to burn for another 5 billion years. As a result, solar energy is a renewable energy source.

  • Wind: Wind energy is obtained from the movement of high-speed air. Windmills are used to generate electricity from wind energy. Because of the Earth's unequal heating, air blows. Wind energy will be available indefinitely as the Earth's heating continues.

2. Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices.

Ans: The following are two renewable energy sources:

(a) Sun: Solar energy is the energy derived from the Sun. Solar energy is a renewable resource.

The following are two non-renewable energy sources:

(b)  Coal is made up of the lifeless remnants of plants and animals that have been buried for millions of years beneath the earth's crust. Coal takes millions of years to produce.

The demand for coal has increased as a result of industrialization. Coal, on the other hand, does not replenish itself quickly. As a result, coal is a nonrenewable or finite energy source.

(a) Wood: Wood comes from forests. Deforestation has resulted in a rapid reduction in the number of trees on the planet. A forest's growth necessitates

NCERT Exercise

1. A solar water heater cannot be used to get hot water on 

(a) a sunny day 

(b) a cloudy day 

(c) a hot day 

(d) a windy day

Ans: (b)A solar water heater uses sun energy to heat water. To function correctly, it requires bright and intense sunshine. On a cloudy day, sunlight is reflected back into the sky by the clouds, preventing it from reaching the ground. As a result, solar energy is not available for the solar heater to function correctly. As a result, on a cloudy day, the solar water heater will not work.

2. Which of the following is not an example of a bio-mass energy source? 

(a) wood 

(b) gobar gas 

(c) nuclear energy 

(d) coal

Ans: (c) Biomass is a renewable energy source derived from plant and animal waste. During nuclear fission and fusion, nuclear energy is released. The uranium atom is attacked with low-energy neutrons during nuclear fission. As a result, the uranium atom splits into two lighter nuclei. This reaction produces a tremendous amount of energy. Lighter nuclei are fused together to generate a comparably heavier nucleus in a nuclear fusion event. This reaction generates a huge quantity of energy. As a result, nuclear energy does not qualify as a bio-mass energy source. Gobar gas is created from animal faeces, while coal is a fossil fuel obtained from the buried rema.

3. Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy? 

(a) Geothermal energy 

(b) Wind energy 

(c) Nuclear energy 

(d) Bio-mass

Ans: (c) Nuclear energy is produced by nuclear fission and fusion reactions. The uranium atom is attacked with low-energy neutrons in nuclear fission. As a result, the uranium atom splits into two lighter nuclei. This reaction produces a significant quantity of energy. In terms of nuclear power,Lighter nuclei are fused together to generate a comparably heavier nucleus in the fusion event. Fission reactions gives you the amount of energy required to fuse the lighter nuclei This is the outcome. generates a huge amount of energy These reactions can be carried out in a laboratory setting.Sunlight is either absent or present. These responses are unaffected by sunshine. Therefore Nuclear energy is not derived entirely from the Sun's energy. Solar energy is the source of geothermal energy, wind energy, and biomass energy.Geothermal energy is stored as heat energy deep within the earth's crust.The absorption of atmospheric and oceanic heat causes the heating. The atmosphere and oceans are heated by sunshine.Wind energy is captured when the wind blows. Wind is caused by the sun's uneven heating of the earth's surface.Dead plants and animal wastes are used to create bio-mass. In the presence of water and sunlight, chemical reactions occur in the dead plants and animal wastes. As a result, biomass is linked to sunlight in an indirect way.

4. Compare and contrast fossil fuels and the Sun as direct sources of energy

Ans: Fossil fuels are energy sources derived from beneath the Earth's crust, such as coal and petroleum. Humans have direct access to them and can use them. As a result, fossil fuels are the only source of direct energy. There are only a few of these available. These are non-renewable energy sources since they cannot be regenerated in nature. The creation of fossil fuels takes millions of years. If the Earth's current fossil fuels run out, it will take several years for new ones to emerge. Fossil fuels are also prohibitively expensive.

Solar energy, on the other hand, is a renewable and direct source of energy. The Sun has been shining for years and will continue to do so for another five billion years. Solar.

5. Compare and contrast bio-mass and hydro-electricity as sources of energy.

Ans: Biomass and hydroelectricity are both renewable energy sources. Dead plants and animal wastes are used to create bio-mass. As a result, it is replenished organically. It's a result of natural occurrences. Wood, gobar gas, and other bio-mass examples are only a few. Hydro-electricity, on the other hand, is derived from the potential energy contained in water at a height. It can be used to generate energy again and over again. It is obtained using mechanical methods and is derived from water.

6. What are the limitations of extracting energy from – 

(a) the wind?

Ans: Windmills are machines that use the wind to generate electricity. A windmill requires a wind speed of over 15 km/h to create power, which is one of the limits of harvesting energy from wind. In addition, a vast number of windmills covering a large region are necessary.

(b) waves?

Ans: Extremely powerful ocean waves are necessary to harvest energy from waves.

(c) tides?

Ans: To collect energy from tides, extremely high tides are required. Tides are also affected by the relative locations of the Sun, Moon, and Earth.

7. On what basis would you classify energy sources as 

(a) renewable and non-renewable?

Ans: Renewable energy is defined as a source of energy that refills itself in nature. Sun, wind, moving water, bio-mass, and other renewable energy sources are only a few examples. Non-renewable energy is defined as a source of energy that does not regenerate itself in nature. Non-renewable energy sources include coal, petroleum, natural gas, and other fossil fuels.

(b) exhaustible and inexhaustible? 

Ans: Exhaustible energy sources are those that will deplete and exhaust within a few hundred years. Coal, petroleum, and other nonrenewable energy sources are all finite. Energy resources that are inexhaustible are ones that will not run out in the future. These options are limitless. One of the limitless sources of energy is bio-mass.

(c) Are the options given in (a) and (b) the same?

Ans: Yes. (a) and (b) both have the same options.

8. What are the qualities of an ideal source of energy?

Ans: An ideal source of energy must be: 

  • cost-effective, 

  • easily accessible, 

  • smoke- and pollution-free, 

  • simple to store and transport, 

  • capable of producing massive amounts of heat and energy when burned.

9. What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?

Ans: The Sun's energy is used to heat and prepare meals in a solar cooker. It is an endless and environmentally friendly renewable energy source. It is available to everyone for free and in an unlimited quantity. As a result, running a solar oven is inexpensive.

The cost of a solar cooker is a significant disadvantage. It is unable to function in the absence of sunlight. As a result, on a cloudy day, it is rendered ineffectual.

Solar cookers have limited utility in regions where the days are very short or where there is cloud cover all year.

10. What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?

Ans: The need for energy rises as a result of industrialization. Fossil fuels are readily available energy sources that can supply this requirement. The increased usage of fossil fuels has a significant negative impact on the environment. Excessive use of fossil fuels raises the amount of greenhouse gases in the atmosphere, resulting in global warming and a rise in sea level. The use of fossil fuels cannot be completely eliminated. However, some actions can be taken, such as not wasting electricity and using electrical appliances. Water should not be used unnecessarily. A large-scale implementation of a public transportation system including mass transit is required. These small steps can help you cut down on your consumption.

MCQs Based on Sources of Energy Chapter 14 Class 10 NCERT Science

1. Which of the following is a nonrenewable source of energy?

  1. Sun

  2. Wood

  3. Wind

  4. Fossil fuels

Answer: (D)

2. Which process is used in the energy extraction from a sea wave?

  1. Generate electricity from the electrical energy of the waves

  2. Generate electricity from the kinetic energy of the waves

  3. Generate electricity from the chemical energy of the waves

  4. Generate electricity from the thermal energy of the waves

Answer: (B)

3. Which is the cause of acid rain?

  1. Oxides of carbon

  2. Oxides of sulphur

  3. Oxides of nitrogen

  4. All of the above

Answer: (D)

4. Hydropower plant is an example of:

  1. Non-conventional energy

  2. Renewable energy

  3. Conventional energy

  4. None of the above

Answer: (A) and (B)

5.  Microorganism used in the biogas plant is:

  1. Aerobic

  2. Anaerobic

  3. Both (A) and (B)

  4. None of the above

Answer: (B)

6. Which of the following is used in making solar cells?

  1. Sodium

  2. Nitrogen

  3. Silicon

  4. Boron

Answer: (C)

7. Greenhouse gas in the environment is caused due to:

  1. Carbon dioxide

  2. Carbon monoxide

  3. Nitrogen

  4. Hydrogen

Answer: (A) 

8. Which is the most suitable alternative to LPG gas?

  1. Biomass

  2. Solar cell

  3. Solar cooker

  4. None of the above

Answer: (C)

Mind Map of Sources of Energy Chapter 14 - NCERT Science Class 10 

Good Sources of Energy - Definition

  • Easily accessible and transportable

  • Easy to store

  • Economical

  • Perform a large amount of work per unit mass or volume

Conventional Sources of Energy - Types

Fossil Fuels

  • Non-renewable energy

  • Need to use conveniently

  • Burning fossil fuels causes air pollution

Thermal Power Plant

  • Generate electricity using the heat energy produced by burning coal

  • Thermal power plants established near oil or coal fields

Hydro Power Plant

  • Generate electricity using the potential and kinetic energy of water

  • These are associated with dams

  • Example: Tehri dam on Ganga river.


  • Animal and plants products to generate energy

  • Example: Cow dung used as Gobar gas.

Wind Energy

  • Environment-friendly gas

  • Used to generate electricity from the kinetic energy of wind

  • Windmills are used to generate power

Non-Conventional Sources of Energy - Types

  • Solar energy

  • Tidal energy

  • Wave energy

  • Ocean thermal energy

  • Geothermal energy

  • Nuclear energy

NCERT Solutions for Class 10 Science Chapter 14 - Sources of Energy

Students who are looking for NCERT Solutions for Class 10 Science Chapter 14 - Sources of Energy PDF can opt for Upcoming Exams and also You can Find the Solutions of All the Science Chapters below.

NCERT Solutions for Class 10 Science

NCERT Solutions For Class 10 Science Chapter 14 Sources of Energy - Free PDF Download

NCERT solutions are useful and crucial because all the questions asked in the exam must be answered in an efficient form. Subject experts prepare sources of energy class 10 NCERT solutions pdf. It encourages students to gain knowledge of the subject effectively through theoretical concepts. Additionally, sources of energy class 10 solutions help students in preparation for further competitive engineering exams.

NCERT Solutions Class 10 Science Chapter 14 - Sources of Energy

Chapter 14 sources of energy class 10 are based on the concept of a good source of energy. The students will acknowledge conventional sources of energy, the importance, and limitations of fossil fuels, thermal power plants, and more. The chapter introduces enormous improvements in technology for using conventional sources.

Students will study some of the basic concepts like how to use solar panels, its importance, how dams produce electricity, and more within this chapter. Ch 14 science class 10 will let students know how to identify a good source of energy. The students will learn types of renewable energy sources like air, water, solar radiation, and others. NCERT solutions for class 10 will educate students about the common differences between conventional sources of energy and non-conventional sources of energy. The students will acknowledge the significant advantages and limitations of wind energy through this chapter.

Chapter 14 encourages students to understand different types of solar energy devices, including solar cells, solar furnaces, and solar water heaters. Along with it, students will go through the advantages and disadvantages of each device in practical life. Nuclear energy is one of the major topics discussed in this chapter. Students will become aware of certain differences between nuclear fission and nuclear fusion through ch 14 science class 10 NCERT solutions.

Class 10 Science Chapter 14 Sources of Energy - Weightage Marks

The class 10th science chapter 14 focuses on different types of energy sources, and the major points of difference between them. In the annual examination, the unit holds a weightage of 3 marks. The chapters discussed in this unit:

Ex 14.1 Ideal Source of Energy.

Ex 14.2 Conventional Sources of Energy: Fossil Fuels, Thermal Power Plant, Hydro Power Plants.

Ex 14.3 Biomass and Wind Energy as Major Energy Resources.

Ex 14.4 Non-Conventional Sources of Energy: Solar Energy, Energy from Sea, Geothermal Energy, Nuclear Energy.

Ex 14.5 Renewable and Non-Renewable Sources of Energy.

Benefits of Sources of Energy Chapter 14 NCERT Solutions

Securing the optimum score in board exams is a major goal that almost every student has their eye set. Going through with class 10 science chapter 14 NCERT solutions help students to ensure that they have in-depth knowledge in simple language. No matter how many times, a student studies and revises a topic, they cannot be sure of how well they know it until they practice. NCERT solutions provide enough material to practice with textbook questions effectively. Some of the benefits of class 10 science ch 14 solutions include:

  • All the NCERT solutions are written in easy-to-understand language plus involve eye-catching formatting. It makes it hassle-free for the students to understand the concept.

  • The solutions are created by subject teachers who are expert in following the upload syllabus and exam pattern of the CBSE board.

  • After practicing NCERT textbooks questions and matching it with the solutions provided, students can attempt any question in their exam.

  • Solutions discussed are as per the CBSE syllabus pattern so that students can revise the chapter in minimum time with maximum accuracy.

  • NCERT solutions for class 10 science offer an abundant scope to practice and test their knowledge with better understanding.


The NCERT Solutions for Class 10 Science Chapter 14 - Sources of Energy, provided by Vedantu, is a valuable tool for Class 10 students. It helps introduce Science concepts in an accessible manner. The provided solutions and explanations simplify complex ideas, making it easier for Class 10 Students to understand the material. By using Vedantu's resources, Students can develop a deeper understanding of NCERT concepts. These solutions are a helpful aid for grade 10 students, empowering them to excel in their studies and develop a genuine appreciation for Source of Energy.

FAQs on NCERT Solutions for Class 10 Science Chapter 14 - Sources Of Energy

1. How can I have an in-depth understanding of Class 10 Science Chapter 14 Sources of Energy?

Class 10 Science Chapter 14 Sources of Energy requires the right knowledge and understanding to get the answers right in exams. For this, students need to first go through the NCERT concepts thoroughly and refer to the NCERT Solutions for Class 10 Science Chapter 14 in case of any doubt in the exercise. Apart from downloading the free PDF, students can avail help from the expert teachers at Vedantu and clear all their doubts regarding the chapter. In order to have an in-depth understanding of the chapter, students must refer to NCERT Solutions for CBSE Class 10 Chapter 14 available on Vedantu’s site and practice previous year papers and sample papers meticulously.

2. What are the advantages of referring to online NCERT Solutions for Class 10 Chapter 14?

Referring to NCERT Solutions for Class 10 Science Chapter 14 is a great way by which students can get their hands on the solutions to the textbook problems. The solutions are provided by subject matter experts. Therefore,  accuracy is promised by Vedantu in all such materials. Students will have knowledge about the various sources of energy by referring to Vedantu’s detailed solutions. The NCERT Solutions are designed as per the latest syllabus and exam pattern and help in scoring in exams. This will also improve students’ knowledge of the chapter.

Q3. What are the disadvantages of fossil fuels?

There are many disadvantages of fossil fuels. Burning of fossil fuels leads to pollution. It also causes acid rain. It deteriorates the fertility of the soil and reduces the quality of potable water. Burning of fossil fuels also results in emissions of hazardous gases into the atmosphere which leads to global warming. Hence, it is advisable to depend more on renewable sources of energy and reduce the dependence on fossil fuels.

Q4. Why is there a need for alternative sources of energy?

There is a need for alternative sources of energy because fossil fuels are non-renewable sources of energy. The source is limited and cannot be replenished again and again. Due to the increasing population, there is an increasing demand for fossil fuels. Hence, we need to find an alternative to fossil fuels so that pollution can be controlled and there will be enough sources of energy to meet human need.

Q5. What is a good source of energy according to the Class 10 Syllabus?

According to Class 10 Chapter 14 NCERT Solutions provided on the Vedantu website (, a good source of energy is something:

  • that can produce a lot of heat per unit mass,

  • can do a large quantity of work per unit mass,

  • can be easily accessible,

  • can be transported and stored easily,

  • is economical and

  • produces a low quantity of smoke.

Q6. What is the main source of energy in India,utilised according to Class 10 Science?

The main source of energy in India is coal. India is known to be the second-largest consumer of coal and has the fifth-largest coal reserves in the world. According to Class 10 Chapter 14 NCERT Solutions, available free of cost on Vedantu, India utilizes 55.88% of the total coal reserve for the generation of electricity in the country, thereby making it the largest source for electricity production and the most important source of energy in India. These renewable and nonrenewable energy sources and their uses are described in the NCERT Solutions.

Q7. What are the sources of energy?

The sources from which energy is generated can be divided into renewable and non-renewable sources of energy. The sources can be classified into:

Renewable Sources of Energy:

  • Solar energy 

  • Wind energy

  • Geothermal energy

  • Hydroelectric energy

  • Ocean energy/Tidal energy

  • Biomass energy

  • Hydrogen and fuel cells

Non-Renewable Sources of Energy:

  • Petroleum/crude oil

  • Hydrocarbon gas liquids

  • Natural gas

  • Coal

  • Nuclear energy

Q8. What is energy in Science Class 10?

Energy is that form of physical quantity which gets transferred from one object to another. The S.I. unit of Energy is Joule (J). Energy can also be defined as 1 Joule of energy getting expended when one Newton of force is applied through one meter of distance. You can refer to Vedantu’s website or app for further clarification on this topic.

Q9. Where can I download the NCERT Solutions for Class 10 Chapter 14?

Students can download the NCERT Solutions Class 10 Chapter 14 from the Vedantu website ( free of cost. They can also refer to additional study material such as revision notes, important questions and sample papers available on Vedantu. All the study material is also available on the Vedantu app absolutely free. Students can use these PDFs to practice and check their answers to ace their exams.