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Lakhmir Singh Physics Class 10 Solutions Chapter 3 - Sources of Energy

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Last updated date: 29th May 2024
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An overview of Lakhmir Singh Class 10 Physics Solutions Chapter 3 - Sources of Energy

Vedantu  - No.1 online tutoring company in India provides you the Free PDF download of Lakhmir Singh Physics Class 10 Solutions Chapter 3 - Sources of Energy solved by Expert Teachers. The textbook solution is to help students to complete their homework and prepare to Score More marks in their exams. Register for our online tuition with the best Physics tutors across India. The NCERT Solutions are always beneficial in your exam preparation and revision. Download NCERT Solutions for Class 10 Math from Vedantu, which are curated by master teachers. Science Students who are looking for Class 10 Science NCERT Solutions will also find the Solutions curated by our Master Teachers really helpful.


The ‘Sources of Energy’ section provides a comprehensive and comprehensive view of the entire subject. Every student will get a clear picture of each topic covered under each Chapter so that they can have a firm understanding of the topic. The ability to hold a strong command over the topic is honestly a must to pass the Class 10 Science examination.


The challenges faced by students while attempting to clear the board exam are many. Based on all these factors, the free study materials give an accurate and thorough idea of what it takes to prepare for the Class 10 Board Exam. They can be downloaded from the Vedantu site and app. 

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Sections of Chapter 3 - Sources of Energy

3.1 What is a good source of energy?

3.2 Conventional sources of energy

3.2.1 Fossil fuels

3.2.2 Thermal power plant

3.2.3 Hydropower plants

3.2.4 Improvements in the technology for using conventional sources of energy

3.3 Alternative or non-conventional sources of energy

3.3.1 Solar energy

3.3.2 Energy from the sea

3.3.3 Geothermal energy

3.3.4 Nuclear energy

3.4 Environmental consequences

3.5 How long will an energy source last us?


List Of Exercises In Chapter 3 - Sources Of Energy

Practical Activity 3.1

Practical Activity 3.2

Exercise 3.1 - 3 questions

Practical Activity 3.3

Exercise 3.2 - 3 questions

Practical Activity 3.4

Practical Activity 3.5

Practical Activity 3.6

Practical Activity 3.7

Exercise 3.3 - 4 questions

Practical Activity 3.8

Exercise 3.4 - 2 questions

Practical Activity 3.9

Exercise 3.5 - 2 questions

Exercise 3.6 - 10 questions

FAQs on Lakhmir Singh Physics Class 10 Solutions Chapter 3 - Sources of Energy

1. What are the conventional sources of energy in India mentioned in Lakhmir Singh Physics Class 10 Solutions Chapter 3 - Sources of Energy?

The conventional sources of energy are crude oil and gas, which are widely consumed by almost all the  Union Territories and states in the country. However, there has been a steady increase in the usage of alternative energy sources such as Solar and Wind Energy. In the past couple of years, renewable energy has been growing at a rapid pace in India.


There are many sources of energy in India. Nuclear and Solar power have always been important elements of the energy mix in the country. However, coal and hydropower are the two important sectors.


The Solar Energy Corporation of India (SECI) registered an increase in solar power installations of 39% in 2017-18. It has also seen the rise in wind power installations, which jumped by an incredible 200% to 197 GW in 2016-17 from 102 GW in 2013-14. This was mainly due to a price-diversification drive by the government.


For Nuclear Power, we are already building 4 GWe at Kudankulam and 2-3 GWe at Kovvada in Andhra Pradesh. We will shortly complete 1 GWe at Kudankulam and 1.5 GWe at Jaitapur in Maharashtra. Kudankulam is likely to be commissioned in 2016-17 and Jaitapur in 2017-18.

 2. Do I need to practice the entire questions provided in NCERT Books for Class 10 Physics Chapter 3 – Sources of Energy?

It is always better to solve all the Chapter exercises as these give you practice to perform well in the exams. The NCERT textbook has activities and exercises after every section. After going through each section, go through the activities and understand them completely. Practice the exercises regularly and try to solve them. There are chances that some of the same questions might come in the examination, so students are advised to read the Chapters thoroughly and practice almost every single question both in the final exercise as well as the section end assessments.  These can be downloaded free of cost from the official website of Vedantu and app.

3. What are some of the alternative or non-conventional sources of energy mentioned in Lakhmir Singh Physics Class 10 Solutions Chapter 3?

With technological progress there is demand for an increase in energy every day. There is a change in our lifestyles and the use of machines is more to do the tasks. There is an increase in the  basic requirements which can improve  our living standards. Since there is the demand for increase in the energy  there should be more sources of energy. The technology should be developed to use the energy that is known in a more efficient way.

4. How is Nuclear Energy generated according to Lakhmir Singh Physics Class 10 Solutions Chapter 3 - Sources of Energy?

Reactors are built-in nuclear power plants to produce energy using nuclear reactions. They do this by splitting atoms. The heat from the reactions drives turbines that create electricity. The keyword here is "fusion." This is how you turn uranium or other heavier atoms into plutonium or protactinium. The process is similar to splitting an atom in a regular, chemical reaction. Plutonium, the fissionable material in the bomb dropped on Hiroshima, is one of the two main types of plutonium used in nuclear weapons today. Another is highly-enriched uranium, which can be enriched up to 20% purity, or more, by adding extra neutrons.

5. How many types of fission reactions are there according to Lakhmir Singh Physics Class 10 Solutions Chapter 3 - Sources of Energy?

There are two types of fission reactions: slow and fast.


Slow fission is how uranium or other heavier atoms are made. You have to heat up the atom in a uranium nucleus, or "fuse," to about a million degrees Celsius. But as the fission process takes place, the neutrons knock some of the fuel elements out of the nucleus which has to be taken out  of the reactor and store them separately in special fuel rods or glassware called fuel modules.


Fast fission takes place inside the reactor and releases more energy and creates more unstable radioactive waste. A fast reactor's core is made up of uranium or thorium fuel rods surrounded by water. The radioactive material is moved through pipes in the reactor. The waste is stored in stainless steel tanks and shipped off-site for disposal.