TRB BT Assistant - Work, Energy and Power Online Test (MCQ Quiz)

1. What is the SI unit of work?

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

2. Which of the following is a scalar quantity?

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

3. If a force of 10 N is applied to an object over a distance of 5 m in the direction of the force, what is the work done?

A) 5 J B) 15 J C) 50 J D) 2 N

4. Work done is defined as the product of force and:

A) Velocity B) Acceleration C) Displacement in the direction of the force D) Time

5. What is the formula for kinetic energy?

A) mgh B) 1/2 mv^2 C) F * d D) P * t

6. An object of mass 5 kg is moving with a velocity of 10 m/s. What is its kinetic energy?

A) 25 J B) 50 J C) 250 J D) 500 J

7. What is the SI unit of energy?

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

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

A) Motion B) Position or configuration C) Temperature D) Charge

9. What is the formula for gravitational potential energy near the Earth's surface?

A) 1/2 mv^2 B) F * d C) mgh D) GMm/r

10. An object of mass 2 kg is at a height of 10 m above the ground. What is its gravitational potential energy (g = 9.8 m/s^2)?

A) 19.6 J B) 98 J C) 196 J D) 20 J

11. What is the SI unit of power?

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

12. Power is defined as the rate of doing work or the rate of transfer of:

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

13. If 100 J of work is done in 5 seconds, what is the power?

A) 5 W B) 20 W C) 100 W D) 500 W

14. Which of the following is equivalent to 1 Watt?

A) 1 Joule per second B) 1 Newton meter C) 1 Joule per meter D) 1 Newton per second

15. The work done by a conservative force is:

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

16. The work done by a non-conservative force, like friction, is typically:

A) Zero B) Positive C) Negative D) Independent of displacement

17. 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 energy D) Momentum

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

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

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

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

20. Which of the following is a unit of energy but not an SI unit?

A) Joule B) Kilowatt-hour C) Watt-second D) Erg

21. What is the work done when a force of 5 N acts on a body and displaces it by 2 m, with the angle between force and displacement being 60 degrees?

A) 5 J B) 10 J C) 2.5 J D) 7.5 J

22. If the velocity of an object is doubled, its kinetic energy becomes:

A) Half B) The same C) Double D) Four times

23. The work done in lifting a body of mass m to a height h is:

A) mgh B) mg/h C) mh/g D) g/mh

24. Which quantity is conserved in an isolated system when only conservative forces are doing work?

A) Kinetic energy B) Potential energy C) Mechanical energy D) Total energy

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

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

26. The potential energy stored in a spring is given by the formula:

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

27. What is the power of a person who lifts 10 kg of mass to a height of 5 m in 10 seconds? (g = 9.8 m/s^2)

A) 4.9 W B) 9.8 W C) 49 W D) 98 W

28. If the displacement of an object is zero, the work done by any force acting on it is:

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

29. Which of the following statements is true about power?

A) It is the total energy consumed. B) It is the rate at which work is done. C) It is the energy stored in an object. D) It is the force applied over a distance.

30. A force is applied at an angle of 90 degrees to the direction of displacement. The work done by the force is:

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

31. The energy required to change the state of motion of an object is directly related to the:

A) Work done on the object B) Power exerted C) Potential energy D) Mass of the object only

32. When is the work done by a force negative?

A) When the force is in the direction of displacement. B) When the force opposes the direction of displacement. C) When the force is perpendicular to displacement. D) When there is no displacement.

33. Which principle relates work and energy in a system?

A) Newton's Third Law B) Conservation of Momentum C) Work-Energy Theorem D) Conservation of Mass

34. What is the power rating of a light bulb that consumes 100 Joules of energy in 1 second?

A) 0.01 W B) 1 W C) 10 W D) 100 W

35. If an object's mass is halved and its velocity is doubled, its kinetic energy changes by a factor of:

A) 1/2 B) 1 C) 2 D) 4

36. What is the work done by the gravitational force when an object is lifted vertically upwards by a height h?

A) mgh B) -mgh C) 0 D) mg/h

37. Which type of energy is associated with the motion of atoms and molecules within a substance?

A) Kinetic energy B) Potential energy C) Thermal energy D) Chemical energy

38. The energy stored in a chemical bond is an example of:

A) Kinetic energy B) Gravitational potential energy C) Elastic potential energy D) Chemical potential energy

39. A machine does 500 J of work in 10 seconds. What is its power output?

A) 5 J/s B) 50 J/s C) 0.5 W D) 50 W

40. If the speed of a moving object is reduced to half, its kinetic energy will be:

A) Reduced to one fourth B) Reduced to half C) Doubled D) Quadrupled

41. What is the work done by the centripetal force on an object moving in a circular path?

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

42. The ability to do work is defined as:

A) Force B) Power C) Energy D) Momentum

43. Which quantity measures the rate at which energy is transferred or converted?

A) Work B) Power C) Energy D) Efficiency

44. If an object is moving, it possesses:

A) Potential energy only B) Kinetic energy only C) Both potential and kinetic energy D) No energy

45. A body is pushed along a frictionless horizontal surface. The work done by gravity on the body is:

A) Positive B) Negative C) Zero D) Depends on the distance

46. What is the unit of power in the imperial system, often used for engines?

A) Joule per second B) Kilowatt C) Horsepower D) Watt

47. Which law states that energy cannot be created or destroyed, only transformed from one form to another?

A) Newton's First Law B) Work-Energy Theorem C) Law of Conservation of Energy D) Law of Conservation of Momentum

48. If the net force acting on an object is zero, then the net work done on the object is:

A) Always positive B) Always negative C) Always zero D) Can be positive or negative

49. The energy possessed by an object due to its deformation, like a stretched rubber band, is called:

A) Gravitational Potential Energy B) Kinetic Energy C) Elastic Potential Energy D) Thermal Energy

50. What is the work done by a force if it causes no displacement?

A) Maximum positive B) Maximum negative C) Zero D) Depends on the force magnitude

Work, Energy and Power - Online Test

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