NEET UG - Work energy theorem, power, potential energy of spring Online Test (MCQ Quiz)

1. According to the work-energy theorem, the net work done on a particle is equal to the change in its:

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

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

A) Decrease B) Increase C) Remain constant D) Become zero

3. Which of the following is the unit of power?

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

4. Power is defined as the rate of doing:

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

5. If a force of 10 N acts on a body and it moves 5 meters in the direction of the force, the work done is:

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

6. A body of mass 'm' moving with velocity 'v' has kinetic energy given by:

A) mgh B) 1/2 mv^2 C) mv D) mg

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

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

8. In the formula for spring potential energy, 'k' represents:

A) Displacement B) Force constant C) Mass D) Velocity

9. If a spring is stretched by a distance 'x' from its equilibrium position, the potential energy stored is proportional to:

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

10. Which type of energy is associated with the position or configuration of an object?

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

11. The work-energy theorem applies to the:

A) Net force acting on the object B) Sum of all forces acting on the object C) Individual forces acting on the object D) Gravitational force only

12. If the net work done on an object is zero, what can be said about its kinetic energy?

A) It increases B) It decreases C) It remains constant D) It becomes negative

13. 1 kilowatt-hour (kWh) is equal to:

A) 3.6 x 10^6 Joules B) 3.6 x 10^3 Joules C) 1000 Joules D) 360 Joules

14. If a machine does 100 J of work in 10 seconds, its power is:

A) 10 W B) 1000 W C) 1 W D) 0.1 W

15. The potential energy of a spring is zero when:

A) It is compressed B) It is stretched C) It is at its equilibrium position D) It is broken

16. A spring with spring constant k = 200 N/m is stretched by 0.1 m. The potential energy stored is:

A) 0.2 J B) 2 J C) 1 J D) 0.02 J

17. What is the dimension of power?

A) [MLT^-2] B) [ML^2T^-2] C) [ML^2T^-3] D) [MLT^-3]

18. If the velocity of a body doubles, its kinetic energy becomes:

A) Half B) Double C) Four times D) One fourth

19. Which of the following is a conservative force?

A) Friction B) Air resistance C) Gravitational force D) Tension in a string

20. Work done by a conservative force is equal to the change in:

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

21. If a spring is compressed by a distance 'x', the potential energy stored is:

A) -1/2 kx^2 B) 1/2 kx^2 C) kx D) 0

22. Which quantity is conserved in the absence of non-conservative forces?

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

23. A 10 kg object is moving at 5 m/s. Its kinetic energy is:

A) 25 J B) 50 J C) 125 J D) 250 J

24. The unit of energy is:

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

25. Power is the scalar product of force and:

A) Displacement B) Velocity C) Acceleration D) Momentum

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

A) Increase B) Decrease C) Remain constant D) Become infinite

27. The potential energy of a spring is given by U = 1/2 kx^2. If the spring is stretched twice as much, the potential energy becomes:

A) Twice B) Four times C) Half D) One fourth

28. Work done by friction is always:

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

29. Which of the following is a unit of power?

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

30. If a body is at rest, its kinetic energy is:

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

31. The work done in stretching a spring by 1 cm from its equilibrium position is W. The work done in stretching it by 2 cm is:

A) W B) 2W C) 3W D) 4W

32. Which of the following statements is incorrect regarding the work-energy theorem?

A) It relates work done to change in kinetic energy. B) It is valid for both conservative and non-conservative forces. C) It states that net work done is equal to the change in potential energy. D) It is a scalar equation.

33. A force F = (2i + 3j) N acts on a particle that moves from position r1 = (1i + 1j) m to r2 = (2i + 3j) m. The work done by the force is:

A) 5 J B) 7 J C) 8 J D) 10 J

34. If the speed of a particle decreases, its kinetic energy:

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

35. Which of the following represents the potential energy of a spring at equilibrium?

A) Maximum B) Minimum C) Zero D) Cannot be determined

36. The power of a motor is 100 W. It lifts a load of 1000 N to a height of 10 m. The time taken is:

A) 10 s B) 100 s C) 1 s D) 0.1 s

37. The work done by a centripetal force is always:

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

38. If the potential energy of an object decreases, its kinetic energy:

A) Increases (if mechanical energy is conserved) B) Decreases (if mechanical energy is conserved) C) Remains constant D) Becomes zero

39. The spring constant 'k' has units of:

A) N/m B) Nm C) N/m^2 D) J/m

40. What is the work done when a force of 5 N displaces an object by 2 m at an angle of 60 degrees between the force and displacement?

A) 10 J B) 5 J C) 2.5 J D) 8.66 J

41. Which of the following is a unit of work?

A) Newton-meter B) Watt C) Joule per second D) Pascal

42. If the net force on an object is zero, then its acceleration is:

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

43. A spring is compressed by 5 cm. If its spring constant is 100 N/m, the potential energy stored is:

A) 0.125 J B) 0.25 J C) 0.5 J D) 0.0125 J

44. Power is the rate of transfer of:

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

45. The work-energy theorem is a consequence of Newton's:

A) First Law B) Second Law C) Third Law D) Law of Gravitation

46. If a spring is stretched from x=0 to x=L, the work done is proportional to:

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

47. The potential energy of a spring is minimum when it is:

A) Stretched maximally B) Compressed maximally C) At equilibrium D) Half stretched

48. A force of 20 N is applied to a spring, stretching it by 0.1 m. The spring constant is:

A) 2 N/m B) 20 N/m C) 200 N/m D) 0.2 N/m

49. Which of the following is NOT a unit of power?

A) Horsepower B) Joule/second C) Watt D) Newton-meter

50. If the work done by the net force on a particle is zero, then the particle's kinetic energy:

A) Must be zero B) Must be constant C) Must increase D) Must decrease

Work energy theorem, power, potential energy of spring - Online Test

Test Results