Law of Conservation of Energy Quiz - CBSE Class 7 Science

Free practice quiz: Law of Conservation of Energy (CBSE Class 7 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 7 Science practice quiz has 19 multiple-choice questions on Law of Conservation of Energy, and 19 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What does the law of conservation of energy state?

   1. Energy cannot be created or destroyed.
   2. Energy can only be created.
   3. Energy cannot change forms.
   4. Energy is only found in machines.
   Show answer

   Answer: A. Energy cannot be created or destroyed.

   The law of conservation of energy states that energy cannot be created or destroyed; it can only change forms. This is fundamental to understanding energy in physics.

2. What energy transformation occurs when you rub your hands together quickly?

   1. Kinetic energy to sound energy
   2. Thermal energy to potential energy
   3. Mechanical energy to thermal energy
   4. Electric energy to light energy
   Show answer

   Answer: C. Mechanical energy to thermal energy

   When you rub your hands together quickly, the mechanical energy from the motion is transformed into thermal energy, causing your hands to warm up.

3. Which type of energy does a battery store?

   1. Kinetic energy
   2. Potential energy
   3. Nuclear energy
   4. Solar energy
   Show answer

   Answer: B. Potential energy

   Batteries store chemical energy, which can be viewed as potential energy, and when used, this energy is converted into electrical energy.

4. In a car engine, what type of energy conversion occurs?

   1. Potential to kinetic
   2. Chemical to kinetic
   3. Thermal to mechanical
   4. Electrical to thermal
   Show answer

   Answer: B. Chemical to kinetic

   In a car engine, the chemical energy stored in fuel is converted to kinetic energy to move the vehicle.

5. What energy conversion occurs in a wind turbine?

   1. Wind energy to electrical energy
   2. Kinetic energy to potential energy
   3. Thermal energy to mechanical energy
   4. Chemical energy to kinetic energy
   Show answer

   Answer: A. Wind energy to electrical energy

   Wind turbines convert wind energy (kinetic) into electrical energy, demonstrating an effective method of renewable energy generation.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What happens to energy in a closed system?
2. If a ball is thrown up, what happens to its kinetic energy as it rises?
3. Which process is an example of energy conservation?
4. When a light bulb is on, what type of energy is primarily being used?
5. How is energy conserved in a rollercoaster ride?
6. What happens to energy in a pendulum at the highest point of its swing?
7. How can energy be converted from one form to another?
8. What is the main energy transformation taking place in a solar panel?
9. During photosynthesis, energy is transformed into which type of energy?
10. What type of energy is emitted when a candle burns?
11. In an energy-efficient appliance, how is energy preservation achieved?
12. How can mechanical energy be converted into thermal energy?
13. What is the significance of energy transformations in ecosystems?
14. How does understanding energy conservation help in daily life?

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