Work and Energy Quiz - CBSE Class 9 Science

Free practice quiz: Work and Energy (CBSE Class 9 Science). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science practice quiz has 18 multiple-choice questions on Work and Energy, and 18 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 done when a force moves an object 1 meter in the direction of the force?

   1. 1 Joule
   2. 2 Joules
   3. 0.5 Joules
   4. 3 Joules
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   Answer: A. 1 Joule

   Work is defined as the product of force and displacement in the direction of the force. Here, if a force of 1 Newton moves an object 1 meter, the work done is 1 Joule (Work = Force x Displacement = 1N x 1m).

2. What is kinetic energy?

   1. Energy stored in an object
   2. Energy due to motion
   3. Energy due to position
   4. None of the above
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   Answer: B. Energy due to motion

   Kinetic energy is defined as the energy an object possesses due to its motion, expressed as KE = 1/2 mv².

3. If a system converts all its potential energy into kinetic energy, what can be said about the total energy?

   1. It is lost
   2. It is conserved
   3. It increases
   4. It decreases
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   Answer: B. It is conserved

   According to the law of conservation of energy, energy in a closed system remains constant. Potential energy converted to kinetic energy means total energy is conserved.

4. An object of mass m is lifted to a height h. Which of the following expressions gives its potential energy?

   1. mgh
   2. 1/2 mv²
   3. mgh/2
   4. gh
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   Answer: A. mgh

   The potential energy of an object lifted to a height h is given by PE = mgh, where m is mass and g is the acceleration due to gravity.

5. In a closed system, if energy is converted from one form to another, what can be said about the total energy?

   1. It increases
   2. It decreases
   3. It is conserved
   4. It changes unpredictably
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   Answer: C. It is conserved

   In a closed system, energy can change forms (e.g., potential to kinetic) but the total energy remains constant, demonstrating conservation of energy.

More questions in this quiz

Answers and explanations are in the full quiz.

1. If 2 Joules of work is done in moving an object 2 meters, what is the force applied?
2. Which of the following is a unit of work?
3. Which expression correctly represents kinetic energy?
4. What happens to the kinetic energy of an object if its speed doubles?
5. What is gravitational potential energy?
6. What is the work-energy theorem?
7. A force does 50 Joules of work on an object, increasing its speed. If the object's initial kinetic energy was 20 Joules, what is its final kinetic energy?
8. A roller coaster at the top of a hill has maximum potential energy. What happens to this energy as it descends?
9. Which of the following scenarios represents an increase in kinetic energy?
10. If a 4 kg object moves at a speed of 3 m/s, what is its kinetic energy?
11. What is the relationship between work done and energy transfer?
12. When a pendulum swings, what type of energy is highest at its highest point?
13. If a system is losing energy as heat, what happens to the mechanical energy of that system?

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