Work and Energy Quiz - CBSE Class 12 Physics

Free practice quiz: Work and Energy (CBSE Class 12 Physics). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Physics practice quiz has 20 multiple-choice questions on Work and Energy, and 20 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 is the work done when a force of 10 N moves an object 5 m in the direction of the force?

   1. 15 J
   2. 50 J
   3. 5 J
   4. 10 J
   Show answer

   Answer: B. 50 J

   Work done (W) is calculated using the formula W = F × d, where F is the force and d is the distance. Here, W = 10 N × 5 m = 50 J.

2. If an object is moved 10 meters by a variable force, resulting in 100 J of work, what is the average force applied?

   1. 10 N
   2. 20 N
   3. 15 N
   4. 5 N
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   Answer: A. 10 N

   The average force can be found using the formula W = F × d. Rearranging gives F = W/d. Here, F = 100 J / 10 m = 10 N.

3. In an isolated system, the total energy remains constant due to which principle?

   1. Conservation of momentum
   2. Conservation of energy
   3. Conservation of mass
   4. None of the above
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   Answer: B. Conservation of energy

   The law of conservation of energy states that in an isolated system, the total energy remains constant; energy cannot be created or destroyed, only transformed.

4. If a spring is compressed and then released, what happens to the elastic potential energy?

   1. It is lost
   2. It converts to kinetic energy
   3. It converts to frictional energy
   4. It mass increases
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   Answer: B. It converts to kinetic energy

   When a compressed spring is released, the elastic potential energy stored in the spring is converted to kinetic energy as the spring returns to its original shape.

5. When is the kinetic energy of an object zero?

   1. When the object is moving fast
   2. When the object is at rest
   3. When the object is thrown
   4. When the object is falling
   Show answer

   Answer: B. When the object is at rest

   Kinetic energy is defined as the energy of a moving object. Thus, when an object is at rest (not moving), its kinetic energy is zero.

More questions in this quiz

Answers and explanations are in the full quiz.

1. If no displacement occurs, what is the work done by a force?
2. A 2 kg object is raised to a height of 3 m. What is the work done against gravity? (Assume g = 9.8 m/s²)
3. How much work is done when a force of 20 N moves an object 0 meters?
4. Which of the following energy forms is associated with an object's position?
5. A lever reduces the amount of what when lifting a load?
6. How is kinetic energy defined?
7. What unit is used to measure energy?
8. A 500 kg car is moving with a velocity of 20 m/s. What is its kinetic energy?
9. Which of the following statements best describes the relationship between work and energy?
10. Which concept explains why a skateboarder can coast smoothly down a ramp?
11. What type of energy does a moving vehicle possess?
12. What does the work-energy principle state?
13. How does lifting an object higher change its gravitational potential energy?
14. What happens to the total mechanical energy of a system when friction is present?
15. In a closed system, what remains constant when only conservative forces are acting?

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