Master Class 9 Science – Work and Energy with Our MCQ Mock Test!

Do you know how work, energy, and power are related in everyday life? Test your understanding with this MCQ-based mock test on Work and Energy, designed as per the latest Class 9 Science syllabus. This test covers all essential topics — concept of work done, different forms of energy, kinetic and potential energy, law of conservation of energy, and power with numerical-based questions for solid practice.

Each question in this mock test is designed to help you revise key formulas, strengthen conceptual clarity, and get comfortable with exam-style problem solving. It’s the perfect tool for quick revision, self-assessment, and boosting your confidence before exams.

Attempt now and power up your preparation for the chapter “Work and Energy”!

1. A microphone converts sound energy to

 
 
 
 

2. If a force of F newton moves a body with constant speed v, the power delivered by it is

 
 
 
 

3. A man holds and displaces a 20 kg mass horizontally in his stretched hand.

 
 
 
 

4. A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car

 
 
 
 

5. Two equal forces acting at angles 30° and 60° with the horizontal displace a body equally on a horizontal surface. Work done in the two cases are W1 and W2 respectively. Then

 
 
 
 

6. In case of negative work the angle between the force and displacement is

 
 
 
 

7. If 1 newton of force displaces a body by 1 m, the work done is

 
 
 
 

8. Two masses m and 2m are dropped from certain height ‘h’. Then on reaching the ground,

 
 
 
 

9. A mass m is moving in a circle of radius 1 m with a uniform speed of 5 m/s.

The work done when its radius turns by 60° is
 
 
 
 

10. A tank contains water of mass ‘m’ to a height ‘h’. The potential energy associated is

 
 
 
 

11. An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same

 
 
 
 

12. A mass is moving 5 m/s with speed of along the x-direction on a smooth surface, when a force of 5 N acts on it along the y-axis. The work done by against the force is

 
 
 
 

13. A boy holds a mass on his stretched hand. Then

 
 
 
 

14. An electric bulb of 60 W burns for 5 hours a day. The cost of electricity involved in a month of 30 days at  3.00 per unit is (in )

 
 
 
 

15. In the explosion of a cracker/bomb

 
 
 
 

16. Two cars A and B approaching each other with momentum of 50 kg m/s and 25 kg m/s respectively, stick to each other after collision. The momentum after the collision is

 
 
 
 

17. On tripling the speed of motion of a body, the change in K.E. is

 
 
 
 

18. In a collision,

 
 
 
 

19. One unit of electricity is consumed by

A : P = 40 W bulb used for t = 25 hours
B : P = 20 W bulb used for t = 50 hours
Both A and B are true as, energy E in kWh is best related as
 
 
 
 

20. Which of the following energy cannot be completely converted into other forms due to the transmission system ?

 
 
 
 

21. A bullet entering a metal block of 30 cm length stops on reaching 25 cm. The energy with the bullet will be lost

 
 
 
 

22. In an oscillating simple pendulum,

 
 
 
 

23. One kWh is

 
 
 
 

24. A battery lights a bulb. The sequence of energy transfer in the process is

 
 
 
 

25. A mass ‘m’ falls from a height ‘h’. At any point on its path the total energy is

 
 
 
 

26. When a body falls freely towards the earth, then its total energy

 
 
 
 

27. A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms–2)

 
 
 
 

28. A : 50 kg man climbing a ‘slant length of 5 m along a 30° incline.

B : 25 kg man running with 2 m/s speed.
C : A force of 5 N acting on an object moving with 5 m/s speed for 5 min. If the energies in A, B and C are EA, EB and EC respectively, then
 
 
 
 

29. If a 60 W bulb and a 40 W bulb are connected to a source of 220 V potential, the bulb glowing brighter is

 
 
 
 

30. If the bulbs of 60 W and 40 W are connected in series to a 220 V source the bulb which glows brighter is

 
 
 
 

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