Section A: Give Reason (10 Marks)

1. Work is said to be done only when displacement occurs. Explain.
2. More work is done when displacement is greater, even if the force remains the same. Why?
3. When the rubber band of a catapult is stretched and released, the stone flies off. Explain.
4. Potential energy is also known as stored energy. Why?
5. Running a longer distance makes a person more tired. Why?
6. Energy is measured in Joules in SI units. Why?
7. Coal and petroleum are considered non-renewable energy resources. Why?
8. Solar energy is considered the most important source of energy. Explain.
9. Why is sound also considered a form of energy?
10. Using renewable energy sources is beneficial for the environment. Why?

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Section B: True or False (10 Marks)

(Write ‘True’ if the statement is correct, otherwise write ‘False’ and correct the statement.)

1. Work is done even if no displacement occurs.
2. The capacity to do work is called energy.
3. Kinetic energy is possessed due to the position of an object.
4. A stretched bow has potential energy.
5. Chemical energy is a form of mechanical energy.
6. Wind energy is a conventional energy source.
7. Electricity generated from ocean waves is an example of tidal energy.
8. The Koyna project in Maharashtra is a hydroelectric power plant.
9. Sound energy cannot perform any work.
10. Solar energy is an example of chemical energy.

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Section C: Multiple Choice Questions (10 Marks)

(Choose the correct answer from the given options.)

1. What is the unit of energy in SI units?
   a) Calorie
   b) Joule
   c) Newton
   d) Watt
2. Which of the following is an example of kinetic energy?
   a) A stretched rubber band
   b) A moving car
   c) Water stored in a dam
   d) A book kept on a table
3. What is the primary source of all energy on Earth?
   a) Wind
   b) Water
   c) Sun
   d) Fossil fuels
4. Which type of energy is stored in a battery?
   a) Heat energy
   b) Electrical energy
   c) Chemical energy
   d) Nuclear energy
5. In which form is energy stored in food?
   a) Mechanical energy
   b) Chemical energy
   c) Electrical energy
   d) Sound energy
6. What kind of energy transformation occurs when a solar cell produces electricity?
   a) Heat to light
   b) Chemical to electrical
   c) Light to electrical
   d) Kinetic to potential
7. Which of the following is an example of renewable energy?
   a) Coal
   b) Petrol
   c) Solar energy
   d) Natural gas
8. What is the main advantage of using wind energy?
   a) It is a non-renewable source
   b) It produces harmful gases
   c) It is inexhaustible and pollution-free
   d) It requires fossil fuels
9. Which energy transformation occurs in an electric oven?
   a) Electrical to heat
   b) Heat to light
   c) Light to chemical
   d) Chemical to kinetic
10. Which energy source is used in hydroelectric power plants?
    a) Solar energy
    b) Wind energy
    c) Potential energy of water
    d) Chemical energy

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Answer Key

Section A: Give Reason

1. Work requires displacement because without it, no work is done.
2. Displacement increases the work done even if the force remains constant.
3. The stretched rubber stores potential energy, which converts to kinetic energy when released.
4. Potential energy is stored due to an object’s position or state.
5. Running requires continuous energy, leading to exhaustion.
6. SI units standardize measurements; both work and energy are measured in Joules.
7. Coal and petroleum take millions of years to form and cannot be replenished quickly.
8. Solar energy is the source of most energy transformations on Earth.
9. Sound energy can cause vibrations and movement, proving it does work.
10. Renewable energy sources reduce pollution and ensure sustainability.

Section B: True or False

1. False – Work requires displacement.
2. True
3. False – Kinetic energy is due to motion.
4. True
5. False – Chemical energy is stored in substances and is different from mechanical energy.
6. False – Wind energy is a renewable source.
7. True
8. True
9. False – Sound energy can perform work, e.g., breaking glass with loud noise.
10. False – Solar energy is light energy.

Section C: Multiple Choice Answers

1. b) Joule
2. b) A moving car
3. c) Sun
4. c) Chemical energy
5. b) Chemical energy
6. c) Light to electrical
7. c) Solar energy
8. c) It is inexhaustible and pollution-free
9. a) Electrical to heat
10. c) Potential energy of water

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