Work and Energy Quiz - CBSE Class 9 Science

Free practice quiz: Work and Energy (CBSE Class 9 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science 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 work defined as in physics?

   1. The energy expended when a force is applied and displacement occurs.
   2. The force applied on a stationary object.
   3. Energy stored within an object.
   4. The speed of an object.
   Show answer

   Answer: A. The energy expended when a force is applied and displacement occurs.

   Work in physics is defined as the product of force and displacement in the direction of the force.

2. What does negative work indicate in physics?

   1. The force and displacement are in opposite directions.
   2. The force and the displacement are in the same direction.
   3. There is no displacement occurring.
   4. The object is accelerating.
   Show answer

   Answer: A. The force and displacement are in opposite directions.

   Negative work occurs when the force applied on an object is in the opposite direction to the displacement.

3. Identify the scenario where maximum work is done.

   1. When force and displacement are in the same direction.
   2. When force is perpendicular to displacement.
   3. When force is double and displacement is halved.
   4. When there is no displacement.
   Show answer

   Answer: A. When force and displacement are in the same direction.

   Maximum work is done when force causes displacement in its own direction, as work is calculated as force times displacement.

4. How is work calculated if the force is applied at an angle to the displacement?

   1. By multiplying force, displacement, and the cosine of the angle.
   2. By multiplying force, displacement, and the sine of the angle.
   3. By dividing force by displacement and the cosine of the angle.
   4. By adding force to displacement without considering the angle.
   Show answer

   Answer: A. By multiplying force, displacement, and the cosine of the angle.

   Work is calculated as force times displacement times cos(θ), where θ is the angle between the force and displacement.

5. How does power relate to work in a scientific context?

   1. Power is the rate of doing work.
   2. Power doubles the work done.
   3. Power halves the work done.
   4. Power is unrelated to work.
   Show answer

   Answer: A. Power is the rate of doing work.

   Power is defined as the rate at which work is done, calculated as work done per unit time.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the unit of work in the SI system?
2. If a force of 10 N is applied to push a box 5 meters, how much work is done?
3. Which of these is equivalent to one Joule?
4. In which of the following scenarios is no work done?
5. What form of energy is stored by a stretched or compressed spring?
6. When is the work done by gravity considered positive?
7. Which of the following is true about kinetic energy?
8. What is the relationship between work done and energy expended by an object?
9. How does gravitational potential energy depend on the height of an object?
10. What happens to the kinetic energy of an object if its velocity is doubled?
11. If two objects have the same mass but different velocities, what can be said about their kinetic energies?
12. If no work is done, what can be said about an object’s kinetic energy?
13. Which of the following best describes the conservation of mechanical energy?
14. If a moving object's kinetic energy is entirely converted to potential energy, what happens to its speed?
15. How is the efficiency of a machine calculated in terms of energy?

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