Class 10 Science Chapter 14 Sources of Energy
Are you looking for Class 10 Science Chapter 14 Sources of Energy notes and question answers? If yes, you are in the right place. This chapter helps students understand the different sources of energy we use in our daily life and why clean and renewable energy is important for the future. It is an important chapter for school exams, HSLC board exams, and competitive examinations.
In this chapter, you will learn about conventional and non-conventional sources of energy, including fossil fuels, solar energy, wind energy, hydroelectric energy, biomass, biogas, geothermal energy, tidal energy, wave energy, and nuclear energy. You will also understand the advantages and disadvantages of different energy sources and learn why renewable energy is becoming more important in today’s world.
The notes and question answers are written in easy and simple English, so every student can understand the concepts without difficulty. Each topic is explained in a clear and student-friendly way, making learning easier and revision faster before examinations.
Whether you are preparing for class tests, annual examinations, or the HSLC Board Examination, these notes and solutions will help you understand the chapter clearly, improve your knowledge, and score higher marks in Science.
✨ What You Will Get:
- 📘 Easy Chapter Notes
- ❓ Complete Textbook Question Answers
- ⭐ Important Exam Questions
- 📝 Simple and Easy Explanations
- 📚 Quick Revision Notes
- 🎯 HSLC Board Exam Preparation
Start studying Class 10 Science Chapter 14, Sources of Energy, today and make your Science preparation simple, effective, and exam-ready.
Class 10 Science Chapter 14 Sources of Energy
Selected Questions &Answers
Q: Can a source of energy be pollution-free? Why or why not?
Ans: No. The use of any energy source can cause pollution. The level and nature of pollution vary depending on the source.
Q: Write two advantages of biogas.
Ans: It has a high calorific value and is economical.
Q: What are the main sources of energy?
Ans: Coal, petroleum, natural gas, etc.
Q: What is LPG?
Ans: LPG (Liquefied Petroleum Gas) is a mixture of propane and butane obtained during the refining of petroleum.
Q: What is used as fuel in rockets?
Ans: Hydrogen.
Q: Name two renewable sources of energy.
Ans: Hydropower and solar energy.
Q: Give two examples of exhaustible sources of energy.
Ans: Coal and petroleum.
Q: What was the source of heat energy in ancient times?
Ans: Firewood.
Q: Which substances cause acid rain?
Ans: Oxides of carbon, nitrogen, and sulfur are produced by the burning of fossil fuels.
Q: What is an ideal source of energy? HSLC ’19
Ans: A good source of energy should be—
(a) Easily available.
(b) Environment-friendly.
(c) Economical.
(d) Easy to store and transport.
(e) Should produce a large amount of energy per unit volume or mass.
Q: What are the advantages of nuclear energy?
Ans: The advantages of nuclear energy are—
(a) A large amount of energy can be obtained from a small amount of nuclear fuel.
(b) Once fuel is loaded into a reactor, it can produce energy for a long time.
(c) The level of pollution is very low.
Q: Can a source of energy be pollution-free? Why or why not? HSLC’15, ’20
Ans: No. No source can be completely pollution-free. The use of any energy source affects the environment in some way. However, the degree and nature of pollution differ from source to source.
Q: Why do we look for alternative sources of energy? HSLC ’18
Ans: The main sources of energy are fossil fuels, which are limited in theEarth’s crust. They will be exhausted one day. Moreover, burning fossil fuels causes air pollution. Therefore, we look for alternative sources of energy for the future.
Q: What changes have been made in the traditional use of wind and water energy for our convenience?
Ans: For our convenience, wind energy is harnessed using windmills, and emphasis has been given to generating electricity from water energy.
Q: Which type of mirror—concave, convex, or plane—is best suited for use in a solar cooker? Why?
Ans: A concave mirror is best suited for use in a solar cooker because it can reflect a large amount of sunlight and concentrate it at the focus, producing a high amount of heat energy.
Q: What are the limitations of energy obtained from the oceans? HSLC’16, ’20
Ans: The limitations of ocean energy are—
(a) Energy from tides is not steady, and dams can be built only at a few suitable locations.
(b) Energy from waves is not uniform everywhere; it can be harnessed effectively only in places where wave intensity is high.
(c) Although ocean energy has great potential, its commercial use is still limited.
Q: A day when a solar water heater cannot be used effectively is—
(a) A sunny day
(b) A cloudy day
(c) A hot day
(d) A windy day
Ans: (b) A cloudy day.
Q: Which of the following is not an example of a biomass energy source? HSLC ’19
(a) Firewood
(b) Biogas
(c) Nuclear energy
(d) Coal
Ans: (c) Nuclear energy.
Q: Most of the sources of energy we use are derived from stored solar energy. Which of the following is not based on solar energy?
(a) Geothermal energy
(b) Wind energy
(c) Nuclear energy
(d) Biomass
Ans: (c) Nuclear energy.
Q: On what basis are energy sources classified as—
(a) Renewable and non-renewable
(b) Exhaustible and inexhaustible?
Ans:
(a) Renewable energy sources are those that are continuously produced in nature, such as solar energy, wind energy, and water energy. Non-renewableenergy sources take millions of years to form and cannot be replenished in a short time once exhausted.
(b) Limited energy sources are called exhaustible sources, such as coal, petroleum, and natural gas. On the other hand, sources that do not get exhausted easily or ever are called inexhaustible sources, such as wind and water energy.
Q: What are the qualities of an ideal source of energy?
Ans: The qualities of an ideal source of energy are—
(a) It should produce a large amount of heat energy per unit mass on combustion.
(b) It should be economical and easily available.
(c) It should be easy to transport.
(d) It should not produce harmful gases on burning and should not cause air pollution.
Q: Write some advantages of biogas.
Ans: Some advantages of biogas are—
(a) It has a high calorific value.
(b) It burns without producing smoke; hence, it does not cause air pollution.
(c) It is economical.
Q: Why is coal called a fossil fuel?
Ans: Coal is a combustible black or brown sedimentary rock formed from the remains of organic matter buried under the Earth for millions of years and transformed through sedimentation. Therefore, it is called a fossil fuel.
Q: What is biogas used for?
Ans: Biogas is used as a source of heat and light.
Q: Name two gaseous fuels.
Ans: Natural gas and biogas.
Multiple Choice Questions (MCQ)
Q: A day when a solar water heater cannot be used effectively is—
(a) A sunny day
(b) A cloudy day
(c) A hot day
(d) A windy day
Ans: (b) A cloudy day.
Q: Which of the following is not an example of a biomass energy source?
(a) Firewood
(b) Biogas
(c) Nuclear energy
(d) Coal
Ans: (c) Nuclear energy.
Q: Which of the following is a non-renewable resource?
(a) Wind energy
(b) Solar energy
(c) Water energy
(d) Fossil fuels
Ans: (d) Fossil fuels.
Q: Which country is called the “country of winds”?
(a) India
(b) England
(c) Canada
(d) Denmark
Ans: (d) Denmark.
Q: India’s rank in the world in electricity generation using wind energy is—
(a) First
(b) Third
(c) Fifth
(d) Tenth
Ans: (c) Fifth
Q: Where in India is the largest wind energy farm established?
(a) Maharashtra
(b) Gujarat
(c) Delhi
(d) Tamil Nadu
Ans: (d) Tamil Nadu.
Q: Which of the following is not based on solar energy?
(a) Biomass
(b) Nuclear energy
(c) Geothermal energy
(d) Wind energy
Ans: (b) Nuclear energy.
Q: India receives approximately how much solar energy annually?
(a) 5000 TWh
(b) 2000 TWh
(c) 3000 TWh
(d) 1000 TWh
Ans: (a) 5000 TWh.
Q: Nuclear energy is produced by—
(a) Thermonuclear reactions
(b) Fractional distillation
(c) Nuclear fusion
(d) Nuclear fission
Ans: (d) Nuclear fission.
Q: Coke is produced from—
(a) Bituminous coal
(b) Charcoal
(c) Iron
(d) Carbon
Ans: (a) Bituminous coal.
Q: The material used in making solar cells is—
(a) Lithium
(b) Iron
(c) Silicon
(d) Carbon
Ans: (c) Silicon.
