Work energy theorem, power, potential energy of spring - One Line Questions

1. If a spring is compressed by a distance 'x', the potential energy stored is: — 1/2 kx^2
2. What is the dimension of power? — [ML^2T^-3]
3. A spring is compressed by 5 cm. If its spring constant is 100 N/m, the potential energy stored is: — 0.125 J
4. A spring with spring constant k = 200 N/m is stretched by 0.1 m. The potential energy stored is: — 0.2 J
5. 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? — 5 J
6. 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: — 100 s
7. If a machine does 100 J of work in 10 seconds, its power is: — 10 W
8. A force of 20 N is applied to a spring, stretching it by 0.1 m. The spring constant is: — 200 N/m
9. A 10 kg object is moving at 5 m/s. Its kinetic energy is: — 125 J
10. 1 kilowatt-hour (kWh) is equal to: — 3.6 x 10^6 Joules
11. 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: — 7 J
12. 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: — 50 J
13. If the net work done on an object is positive, its kinetic energy will: — Increase
14. In the formula for spring potential energy, 'k' represents: — Force constant
15. Power is the scalar product of force and: — Velocity
16. The work-energy theorem is a consequence of Newton's: — Second Law
17. Which of the following is a conservative force? — Gravitational force
18. If the velocity of a body doubles, its kinetic energy becomes: — Four times
19. Which of the following is NOT a unit of power? — Newton-meter
20. If the net work done on an object is negative, its kinetic energy will: — Decrease
21. If the speed of a particle decreases, its kinetic energy: — Decreases
22. If the potential energy of an object decreases, its kinetic energy: — Increases (if mechanical energy is conserved)
23. If the net work done on an object is zero, what can be said about its kinetic energy? — It remains constant
24. The potential energy of a spring is zero when: — It is at its equilibrium position
25. Which of the following statements is incorrect regarding the work-energy theorem? — It states that net work done is equal to the change in potential energy.
26. Which of the following is the unit of power? — Watt
27. The unit of energy is: — Joule
28. Which of the following is a unit of power? — Joule per second
29. Which type of energy is associated with the position or configuration of an object? — Potential energy
30. Work done by a conservative force is equal to the change in: — Potential energy
31. Which quantity is conserved in the absence of non-conservative forces? — Mechanical energy
32. According to the work-energy theorem, the net work done on a particle is equal to the change in its: — Kinetic energy
33. The potential energy stored in a spring is given by the formula: — 1/2 kx^2
34. If a spring is stretched from x=0 to x=L, the work done is proportional to: — L^2
35. If a body is at rest, its kinetic energy is: — Zero
36. Which of the following represents the potential energy of a spring at equilibrium? — Zero
37. If the net force on an object is zero, then its acceleration is: — Zero
38. A body of mass 'm' moving with velocity 'v' has kinetic energy given by: — 1/2 mv^2
39. If the work done by the net force on a particle is zero, then the particle's kinetic energy: — Must be constant
40. The spring constant 'k' has units of: — N/m
41. The work-energy theorem applies to the: — Net force acting on the object
42. Which of the following is a unit of work? — Newton-meter
43. Work done by friction is always: — Negative
44. The work done by a centripetal force is always: — Zero
45. The potential energy stored in a spring is directly proportional to the square of its: — Extension or compression
46. The potential energy of a spring is minimum when it is: — At equilibrium
47. 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: — Four times
48. 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: — 4W
49. Power is defined as the rate of doing: — Work
50. Power is the rate of transfer of: — Energy
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