JEE Main - Kinetic and potential energy and work–energy theorem Online Test (MCQ Quiz)

1. What is the SI unit of work?

A) Joule B) Watt C) Newton D) Pascal

2. Which of the following is a scalar quantity?

A) Force B) Velocity C) Work D) Momentum

3. The work done by a conservative force is:

A) Dependent on the path taken B) Independent of the path taken C) Always zero D) Always negative

4. Kinetic energy is defined as the energy possessed by an object due to its:

A) Position B) Motion C) State of matter D) Temperature

5. The formula for kinetic energy (KE) is:

A) mgh B) 1/2 mv^2 C) mv D) m/v

6. If the velocity of an object is doubled, its kinetic energy will be:

A) Halved B) Doubled C) Quadrupled D) Tripled

7. Potential energy is the energy possessed by an object due to its:

A) Motion B) Velocity C) Position or configuration D) Mass

8. Gravitational potential energy near the Earth's surface is given by:

A) 1/2 mv^2 B) mgh C) MgR D) Gm1m2/r^2

9. A spring has potential energy stored in it when it is:

A) At its natural length B) Compressed or stretched C) Moving with constant velocity D) At rest

10. The work-energy theorem states that the net work done on an object is equal to the change in its:

A) Potential energy B) Kinetic energy C) Total mechanical energy D) Linear momentum

11. If the net work done on an object is positive, its kinetic energy:

A) Decreases B) Increases C) Remains constant D) Becomes zero

12. If the net work done on an object is negative, its kinetic energy:

A) Increases B) Decreases C) Remains constant D) Becomes infinite

13. A body is moving with a constant velocity. The net work done on it is:

A) Positive B) Negative C) Zero D) Indeterminate

14. The work done by a force F acting on an object that undergoes a displacement d is given by:

A) F/d B) F * d C) F + d D) F - d

15. If a force of 10 N acts on an object and displaces it by 5 meters in the direction of the force, the work done is:

A) 2 Joules B) 50 Joules C) 15 Joules D) 0.5 Joules

16. When is the work done by a force zero?

A) When the force is zero B) When the displacement is zero C) When the force and displacement are perpendicular D) All of the above

17. What is the potential energy of an object at the ground level (reference point)?

A) Maximum B) Minimum C) Zero D) Infinite

18. A ball of mass 'm' is dropped from a height 'h'. Its potential energy at height 'h' is:

A) 0 B) mgh C) 1/2 mgh D) mg/h

19. When the ball in the previous question hits the ground, its potential energy is:

A) mgh B) 1/2 mgh C) 0 D) Maximum

20. In the absence of non-conservative forces, the total mechanical energy (Kinetic Energy + Potential Energy) of a system is:

A) Decreased B) Increased C) Conserved D) Zero

21. A 2 kg object moves with a velocity of 4 m/s. Its kinetic energy is:

A) 4 Joules B) 8 Joules C) 16 Joules D) 32 Joules

22. If an object's kinetic energy is 100 J and its mass is 2 kg, what is its velocity?

A) 5 m/s B) 10 m/s C) 20 m/s D) 100 m/s

23. A block of mass 5 kg is lifted vertically by 3 meters. The work done against gravity is:

A) 15 J B) 3 J C) 5 J D) 150 J

24. A spring is compressed by 0.1 m. If the spring constant is 200 N/m, the potential energy stored is:

A) 1 J B) 2 J C) 10 J D) 20 J

25. The work done by friction is always:

A) Positive B) Negative C) Zero D) Can be positive or negative

26. A car of mass 1000 kg is moving at 20 m/s. If brakes are applied and it stops, the work done by the braking force is:

A) 200,000 J B) -200,000 J C) 100,000 J D) -100,000 J

27. Which of the following is an example of potential energy?

A) Energy of a moving train B) Energy of a coiled spring C) Energy of a sound wave D) Energy of heat

28. Which of the following is an example of kinetic energy?

A) Water stored in a dam B) A stretched rubber band C) A flying airplane D) A compressed gas cylinder

29. The work-energy theorem is a direct consequence of:

A) Newton's first law B) Newton's second law C) Newton's third law D) Conservation of energy

30. If the speed of an object decreases, its kinetic energy:

A) Increases B) Decreases C) Remains the same D) Becomes zero

31. A force of 5 N acts on a particle of mass 1 kg. If the particle starts from rest, its kinetic energy after 10 seconds will be:

A) 250 J B) 500 J C) 1250 J D) 2500 J

32. What is the change in potential energy when an object of mass 'm' is raised from height h1 to h2?

A) mg(h2 - h1) B) mg(h1 - h2) C) mgh1 D) mgh2

33. A 10 kg object is at a height of 5 m. Its potential energy is (g = 10 m/s^2):

A) 50 J B) 100 J C) 500 J D) 1000 J

34. When a body falls freely under gravity, its total mechanical energy:

A) Increases B) Decreases C) Remains constant D) First increases then decreases

35. What is the work done by the centripetal force in circular motion?

A) Positive B) Negative C) Zero D) Depends on speed

36. If the mass of an object is doubled and its velocity is halved, its kinetic energy will be:

A) Halved B) Doubled C) Same D) Quadrupled

37. The potential energy of a spring is given by:

A) kx B) 1/2 kx C) kx^2 D) 1/2 kx^2

38. If a force is applied at an angle θ to the direction of displacement, the work done is:

A) Fd cos θ B) Fd sin θ C) Fd tan θ D) Fd

39. Which of the following statements is true about work done?

A) Work done is always positive. B) Work done is always negative. C) Work done can be positive, negative, or zero. D) Work done is a vector quantity.

40. A 0.5 kg object is moving at 10 m/s. If a force does 20 J of work on it, its new velocity will be approximately:

A) 10 m/s B) 12.4 m/s C) 14.1 m/s D) 15.8 m/s

41. Potential energy is a form of energy associated with:

A) Motion B) Position C) Heat D) Light

42. Kinetic energy is a form of energy associated with:

A) Position B) Temperature C) Motion D) Chemical bonds

43. The work-energy theorem is particularly useful for problems involving:

A) Constant velocity B) Constant acceleration C) Variable forces D) Static equilibrium

44. If an object's kinetic energy is K, and its mass is m, what is its momentum p?

A) sqrt(2mK) B) sqrt(mK/2) C) 2mK D) mK

45. A 2 kg object is at rest. A net force of 4 N acts on it for 3 seconds. What is its kinetic energy at the end of 3 seconds?

A) 18 J B) 36 J C) 72 J D) 144 J

46. The work done by gravity when an object falls from height h to the ground is:

A) -mgh B) mgh C) 0 D) 1/2 mgh

47. If a force does negative work on an object, the object's kinetic energy:

A) Increases B) Decreases C) Stays the same D) Becomes zero

48. A 5 kg object is moving with a velocity of 2 m/s. If its velocity increases to 4 m/s, the change in its kinetic energy is:

A) 10 J B) 20 J C) 30 J D) 40 J

49. The work done by a non-conservative force like friction:

A) Is always zero B) Is always positive C) Is always negative D) Can be positive or negative depending on the situation

50. Which quantity is conserved when a body moves under a conservative force and no external forces act on it?

A) Kinetic energy B) Potential energy C) Total mechanical energy D) Momentum

Kinetic and potential energy and work–energy theorem - Online Test

Test Results