Work, Energy and Power - One Line Questions

1. What is the power rating of a light bulb that consumes 100 Joules of energy in 1 second? — 100 W
2. Which of the following is equivalent to 1 Watt? — 1 Joule per second
3. If an object's mass is halved and its velocity is doubled, its kinetic energy changes by a factor of: — 2
4. What is the formula for gravitational potential energy near the Earth's surface? — mgh
5. 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)? — 196 J
6. An object of mass 5 kg is moving with a velocity of 10 m/s. What is its kinetic energy? — 250 J
7. 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) — 49 W
8. 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? — 50 J
9. 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? — 2.5 J
10. A machine does 500 J of work in 10 seconds. What is its power output? — 50 W
11. If 100 J of work is done in 5 seconds, what is the power? — 20 W
12. If the net force acting on an object is zero, then the net work done on the object is: — Always zero
13. A spring has potential energy stored in it when it is: — Compressed or stretched
14. If the net work done on an object is positive, its kinetic energy: — Increases
15. The work done by a conservative force is: — Independent of the path taken
16. Which of the following is a scalar quantity? — Work
17. Power is defined as the rate of doing work or the rate of transfer of: — Energy
18. The ability to do work is defined as: — Energy
19. The energy possessed by an object due to its deformation, like a stretched rubber band, is called: — Elastic Potential Energy
20. If the velocity of an object is doubled, its kinetic energy becomes: — Four times
21. When a body falls freely under gravity, its mechanical energy: — Remains constant
22. Which of the following statements is true about power? — It is the rate at which work is done.
23. What is the SI unit of power? — Watt
24. Which of the following is a unit of energy but not an SI unit? — Erg
25. What is the unit of power in the imperial system, often used for engines? — Horsepower
26. Which quantity is conserved in an isolated system when only conservative forces are doing work? — Mechanical energy
27. Which type of energy is associated with the motion of atoms and molecules within a substance? — Thermal energy
28. The energy stored in a chemical bond is an example of: — Chemical potential energy
29. The potential energy stored in a spring is given by the formula: — 1/2 kx^2
30. What is the work done by a force if it causes no displacement? — Zero
31. What is the formula for kinetic energy? — 1/2 mv^2
32. The work done in lifting a body of mass m to a height h is: — mgh
33. What is the work done by the gravitational force when an object is lifted vertically upwards by a height h? — -mgh
34. Potential energy is the energy possessed by an object due to its: — Position or configuration
35. Which law states that energy cannot be created or destroyed, only transformed from one form to another? — Law of Conservation of Energy
36. Which principle relates work and energy in a system? — Work-Energy Theorem
37. If the displacement of an object is zero, the work done by any force acting on it is: — Zero
38. A force is applied at an angle of 90 degrees to the direction of displacement. The work done by the force is: — Zero
39. What is the work done by the centripetal force on an object moving in a circular path? — Zero
40. A body is pushed along a frictionless horizontal surface. The work done by gravity on the body is: — Zero
41. The Work-Energy Theorem states that the net work done on an object is equal to the change in its: — Kinetic energy
42. If an object is moving, it possesses: — Both potential and kinetic energy
43. If the speed of a moving object is reduced to half, its kinetic energy will be: — Reduced to one fourth
44. Work done is defined as the product of force and: — Displacement in the direction of the force
45. What is the SI unit of work? — Joule
46. What is the SI unit of energy? — Joule
47. When is the work done by a force negative? — When the force opposes the direction of displacement.
48. Which quantity measures the rate at which energy is transferred or converted? — Power
49. The energy required to change the state of motion of an object is directly related to the: — Work done on the object
50. The work done by a non-conservative force, like friction, is typically: — Negative
All One Line Questions
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