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.

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.
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   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
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   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
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   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
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   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
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   Answer: A. Wind energy to electrical energy

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

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