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.

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.
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   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.
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   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.
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   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.
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   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.
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   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.

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