JEE (Main) Physics - Work, Energy and Power Multiple Choice Questions (MCQs)
16. The work done in lifting an object of mass m through a height h is:
Answer: a) mgh
17. The unit of work in the SI system is:
Answer: a) Joule
18. If the force applied on an object is at an angle to the direction of motion, the work done by the force is:
Answer: b) Positive
19. The work done in a non-conservative force field is:
Answer: b) Positive or negative depending on the path
20. The change in kinetic energy of a body is equal to:
Answer: a) The work done on the body
21. The kinetic energy of a body is directly proportional to:
Answer: b) Velocity squared
22. The principle of conservation of mechanical energy states that:
Answer: c) Total mechanical energy is constant in the absence of friction
23. In a spring, the potential energy stored is proportional to:
Answer: b) The square of the displacement
24. If the kinetic energy of a body is doubled, its velocity becomes:
Answer: b) Double
25. Power is defined as:
Answer: a) Work done per unit time
26. If the velocity of an object is doubled, its kinetic energy becomes:
Answer: c) Four times
27. The work done on a body is always equal to the change in its:
Answer: b) Kinetic energy
28. The rate at which work is done is called:
Answer: a) Power
29. The work-energy theorem states that the work done by a net force on an object is equal to:
Answer: d) Change in its kinetic energy
30. In the case of circular motion, the work done in one complete revolution is:
Answer: a) Zero
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