Practice 100 Work, Power, and Energy MCQs with answers covering work done, kinetic and potential energy, power, energy transformations, and conservation of energy. Ideal for school exams and physics revision.
Work, Power, and Energy are core concepts in physics that explain how forces cause movement, how quickly work is done, and how energy is stored and transformed in everyday life. This carefully prepared collection of 100 Work, Power, and Energy MCQs with answers covers essential topics such as work done by a force, kinetic and potential energy, power calculation, energy conversion, and the law of conservation of energy. Designed for Class 6 to Class 10 students, these multiple choice questions are ideal for exam preparation, competitive tests, and quick revision, helping learners strengthen conceptual understanding and improve problem-solving skills through objective-based practice.
1. Work is said to be done when a force:
A. Is applied
B. Causes displacement
C. Is removed
D. Is balanced
Answer: B
2. The SI unit of work is:
A. Watt
B. Joule
C. Newton
D. Pascal
Answer: B
3. Which formula represents work done?
A. Force ÷ Distance
B. Force × Distance
C. Distance ÷ Time
D. Mass × Acceleration
Answer: B
4. Work done is zero when the displacement is:
A. Maximum
B. Minimum
C. Zero
D. Infinite
Answer: C
5. If a person pushes a wall and it does not move, the work done is:
A. Maximum
B. Minimum
C. Zero
D. Infinite
Answer: C
6. Energy is defined as the capacity to do:
A. Force
B. Power
C. Motion
D. Work
Answer: D
7. The SI unit of energy is:
A. Joule
B. Watt
C. Newton
D. Calorie
Answer: A
8. Which of the following is a form of energy?
A. Force
B. Speed
C. Heat
D. Mass
Answer: C
9. Energy possessed due to motion is called:
A. Potential energy
B. Chemical energy
C. Kinetic energy
D. Heat energy
Answer: C
10. Energy possessed due to position is called:
A. Kinetic energy
B. Potential energy
C. Electrical energy
D. Nuclear energy
Answer: B
11. Which formula represents kinetic energy?
A. mgh
B. mv
C. ½mv²
D. Fd
Answer: C
12. Which formula represents potential energy?
A. ½mv²
B. mv²
C. mgh
D. Fd
Answer: C
13. Which energy is stored in a stretched rubber band?
A. Kinetic energy
B. Heat energy
C. Elastic potential energy
D. Electrical energy
Answer: C
14. A moving car has:
A. Potential energy only
B. Kinetic energy only
C. Both kinetic and potential energy
D. No energy
Answer: B
15. Which energy is stored in food?
A. Heat energy
B. Chemical energy
C. Mechanical energy
D. Nuclear energy
Answer: B
16. Power is defined as:
A. Work × Time
B. Work ÷ Time
C. Energy × Force
D. Force ÷ Time
Answer: B
17. The SI unit of power is:
A. Joule
B. Watt
C. Newton
D. Ampere
Answer: B
18. One watt is equal to:
A. 1 joule per second
B. 1 joule per minute
C. 1 newton per second
D. 1 joule per hour
Answer: A
19. A machine that does more work in less time has:
A. Less power
B. No power
C. More power
D. Constant power
Answer: C
20. Which of the following is a unit of power?
A. Joule
B. Kilowatt
C. Newton
D. Pascal
Answer: B
21. Which energy conversion occurs in an electric bulb?
A. Electrical → Mechanical
B. Electrical → Heat and Light
C. Heat → Electrical
D. Chemical → Electrical
Answer: B
22. Which energy is used in running a fan?
A. Chemical
B. Mechanical
C. Electrical
D. Heat
Answer: C
23. Which of the following has kinetic energy?
A. A stone lying on the ground
B. A stretched spring
C. A flying bird
D. A parked car
Answer: C
24. Which of the following has potential energy?
A. Moving bus
B. Flowing river
C. Water stored in a dam
D. Rolling ball
Answer: C
25. The commercial unit of electrical energy is:
A. Joule
B. Watt
C. Kilowatt-hour
D. Ampere
Answer: C
26. Which device converts mechanical energy into electrical energy?
A. Motor
B. Generator
C. Battery
D. Bulb
Answer: B
27. Which device converts electrical energy into mechanical energy?
A. Generator
B. Motor
C. Battery
D. Transformer
Answer: B
28. What happens to energy according to the law of conservation of energy?
A. It is destroyed
B. It is created
C. It is converted from one form to another
D. It disappears
Answer: C
29. Which statement is correct?
A. Energy can be destroyed
B. Energy can be created
C. Energy can neither be created nor destroyed
D. Energy has no units
Answer: C
30. Which energy transformation takes place in a solar panel?
A. Heat → Electrical
B. Light → Electrical
C. Electrical → Light
D. Chemical → Electrical
Answer: B
31. Which energy is stored in fuels like coal and petrol?
A. Mechanical
B. Chemical
C. Electrical
D. Nuclear
Answer: B
32. What type of energy does a waterfall possess?
A. Heat energy
B. Electrical energy
C. Kinetic energy
D. Nuclear energy
Answer: C
33. Which of the following is not a form of energy?
A. Heat
B. Light
C. Force
D. Sound
Answer: C
34. Which energy is responsible for sound production?
A. Electrical
B. Sound
C. Mechanical
D. Chemical
Answer: C
35. Which energy is produced by vibrating objects?
A. Light energy
B. Sound energy
C. Heat energy
D. Electrical energy
Answer: B
36. Power depends on:
A. Work only
B. Time only
C. Work and time
D. Force only
Answer: C
37. If the same work is done in less time, power will be:
A. Less
B. More
C. Same
D. Zero
Answer: B
38. A person climbing stairs slowly has:
A. More power
B. Less power
C. Same power
D. Zero power
Answer: B
39. Which unit is larger?
A. Joule
B. Kilojoule
C. Watt
D. Newton
Answer: B
40. Which energy is stored in batteries?
A. Electrical
B. Chemical
C. Mechanical
D. Nuclear
Answer: B
41. Which of the following uses wind energy?
A. Generator
B. Windmill
C. Solar cell
D. Battery
Answer: B
42. Energy of flowing water is called:
A. Potential energy
B. Kinetic energy
C. Chemical energy
D. Nuclear energy
Answer: B
43. Which energy source is renewable?
A. Coal
B. Petrol
C. Solar
D. Natural gas
Answer: C
44. Which energy causes an object to glow when heated?
A. Mechanical
B. Electrical
C. Heat
D. Nuclear
Answer: C
45. Which energy is used by plants during photosynthesis?
A. Heat
B. Light
C. Chemical
D. Mechanical
Answer: B
46. What is the unit of force?
A. Joule
B. Newton
C. Watt
D. Pascal
Answer: B
47. If force is zero, work done will be:
A. Maximum
B. Zero
C. Infinite
D. Minimum
Answer: B
48. Which energy is stored in compressed gas?
A. Kinetic
B. Electrical
C. Potential
D. Nuclear
Answer: C
49. What type of energy does a moving fan have?
A. Electrical only
B. Mechanical only
C. Both electrical and mechanical
D. Heat only
Answer: C
50. Which energy transformation occurs in a microphone?
A. Sound → Electrical
B. Electrical → Sound
C. Heat → Sound
D. Mechanical → Heat
Answer: A
51. Which of the following increases power?
A. Less work, more time
B. More work, same time
C. Same work, more time
D. Zero work
Answer: B
52. Which energy is stored in a raised hammer?
A. Kinetic
B. Potential
C. Electrical
D. Heat
Answer: B
53. Which form of energy travels in waves?
A. Mechanical
B. Light
C. Chemical
D. Nuclear
Answer: B
54. Which energy causes motion in machines?
A. Mechanical energy
B. Heat energy
C. Nuclear energy
D. Sound energy
Answer: A
55. Which energy is used in cooking food?
A. Heat
B. Sound
C. Light
D. Mechanical
Answer: A
56. Which of the following has maximum kinetic energy?
A. Slow-moving car
B. Fast-moving car
C. Stationary car
D. Parked bus
Answer: B
57. What happens to potential energy when height increases?
A. Decreases
B. Remains same
C. Increases
D. Becomes zero
Answer: C
58. Which energy is produced in a nuclear reactor?
A. Heat energy
B. Mechanical energy
C. Electrical energy
D. Nuclear energy
Answer: A
59. What is the unit of electrical energy used in homes?
A. Joule
B. Watt
C. Kilowatt-hour
D. Newton
Answer: C
60. Which energy is responsible for vision?
A. Heat
B. Light
C. Sound
D. Electrical
Answer: B
61. Which of the following is a non-renewable energy source?
A. Wind
B. Solar
C. Coal
D. Water
Answer: C
62. Energy stored due to shape change is:
A. Kinetic
B. Elastic potential
C. Chemical
D. Heat
Answer: B
63. Which energy does a stretched bow possess?
A. Chemical
B. Kinetic
C. Potential
D. Electrical
Answer: C
64. Which energy conversion occurs in an electric iron?
A. Electrical → Mechanical
B. Electrical → Heat
C. Heat → Electrical
D. Light → Electrical
Answer: B
65. Which energy is used to lift objects?
A. Mechanical
B. Heat
C. Sound
D. Nuclear
Answer: A
66. Which of the following produces sound energy?
A. Battery
B. Speaker
C. Solar panel
D. Motor
Answer: B
67. Which energy is stored in muscles?
A. Mechanical
B. Chemical
C. Electrical
D. Heat
Answer: B
68. Which energy form is associated with motion and position?
A. Chemical
B. Mechanical
C. Heat
D. Nuclear
Answer: B
69. Which of the following depends on height?
A. Kinetic energy
B. Potential energy
C. Power
D. Speed
Answer: B
70. Which energy source is the Sun?
A. Chemical
B. Nuclear
C. Mechanical
D. Electrical
Answer: B
71. Which energy helps in hearing?
A. Heat
B. Light
C. Sound
D. Electrical
Answer: C
72. Which energy conversion occurs in a torch?
A. Chemical → Electrical → Light
B. Electrical → Chemical
C. Light → Electrical
D. Heat → Light
Answer: A
73. Which energy causes temperature rise?
A. Mechanical
B. Heat
C. Light
D. Sound
Answer: B
74. Which of the following measures power?
A. Joule
B. Watt
C. Newton
D. Calorie
Answer: B
75. Which energy is stored in petroleum?
A. Nuclear
B. Electrical
C. Chemical
D. Mechanical
Answer: C
76. Which form of energy is used in electric heaters?
A. Mechanical
B. Electrical
C. Heat
D. Chemical
Answer: B
77. Which energy causes objects to move?
A. Force
B. Motion
C. Energy
D. Time
Answer: C
78. Which of the following is a renewable energy source?
A. Coal
B. Petrol
C. Wind
D. Diesel
Answer: C
79. Which energy is produced by burning fuels?
A. Electrical
B. Heat
C. Nuclear
D. Mechanical
Answer: B
80. Which energy is used in hydroelectric power plants?
A. Wind
B. Nuclear
C. Water
D. Solar
Answer: C
81. Which energy transformation occurs in a bell?
A. Mechanical → Sound
B. Electrical → Light
C. Heat → Sound
D. Sound → Electrical
Answer: A
82. Which of the following increases kinetic energy?
A. Decreasing speed
B. Increasing mass
C. Increasing speed
D. Decreasing height
Answer: C
83. Which energy is stored in springs?
A. Heat
B. Chemical
C. Elastic potential
D. Nuclear
Answer: C
84. Which energy form does a moving bicycle have?
A. Potential
B. Kinetic
C. Chemical
D. Nuclear
Answer: B
85. Which energy is produced in fireworks?
A. Sound only
B. Light only
C. Heat only
D. Sound, light, and heat
Answer: D
86. Which energy is used by vehicles?
A. Nuclear
B. Chemical
C. Sound
D. Heat
Answer: B
87. Which energy is associated with vibrations?
A. Light
B. Sound
C. Heat
D. Electrical
Answer: B
88. Which energy does a generator produce?
A. Mechanical
B. Chemical
C. Electrical
D. Heat
Answer: C
89. Which energy is lost due to friction?
A. Light
B. Electrical
C. Heat
D. Sound
Answer: C
90. Which energy is stored in an elevated object?
A. Kinetic
B. Potential
C. Chemical
D. Electrical
Answer: B
91. Which energy transformation occurs in photosynthesis?
A. Light → Chemical
B. Chemical → Light
C. Electrical → Chemical
D. Heat → Chemical
Answer: A
92. Which energy causes muscles to work?
A. Heat
B. Chemical
C. Electrical
D. Mechanical
Answer: B
93. Which energy is used in sound systems?
A. Electrical
B. Mechanical
C. Sound
D. Heat
Answer: A
94. Which energy helps objects glow?
A. Heat
B. Light
C. Sound
D. Electrical
Answer: B
95. Which energy is stored in LPG?
A. Electrical
B. Chemical
C. Mechanical
D. Nuclear
Answer: B
96. Which energy is used in microwaves?
A. Electrical
B. Heat
C. Sound
D. Nuclear
Answer: A
97. Which energy is produced by an electric motor?
A. Chemical
B. Mechanical
C. Heat
D. Sound
Answer: B
98. Which energy is related to speed?
A. Potential
B. Chemical
C. Kinetic
D. Nuclear
Answer: C
99. Which energy transformation occurs in a loudspeaker?
A. Electrical → Sound
B. Sound → Electrical
C. Mechanical → Heat
D. Heat → Sound
Answer: A
100. Which statement is correct about energy?
A. Energy can be destroyed
B. Energy has no units
C. Energy can be converted from one form to another
D. Energy cannot do work
Answer: C
