Q1. Work is said to be done when:
A) A body is at rest
B) A force causes displacement
C) Energy is destroyed
D) Velocity is zero
Answer: B) A force causes displacement
Q2. SI unit of work is:
A) Watt
B) Joule
C) Newton
D) Pascal
Answer: B) Joule
Q3. One joule is equal to:
A) 1 N/m
B) 1 N × m
C) 1 kg/m
D) 1 W/s
Answer: B) 1 N × m
Q4. Work done is maximum when the angle between force and displacement is:
A) 0°
B) 45°
C) 90°
D) 180°
Answer: A) 0°
Q5. Work done by a force is zero when the angle between force and displacement is:
A) 30°
B) 60°
C) 90°
D) 180°
Answer: C) 90°
Q6. Formula for work done is:
A) W = F/d
B) W = F × d
C) W = m × a
D) W = P × t²
Answer: B) W = F × d
Q7. Which is a scalar quantity?
A) Force
B) Velocity
C) Work
D) Acceleration
Answer: C) Work
Q8. If a force of 10 N moves an object by 5 m, work done is:
A) 2 J
B) 10 J
C) 50 J
D) 100 J
Answer: C) 50 J
Q9. The rate of doing work is called:
A) Energy
B) Momentum
C) Power
D) Pressure
Answer: C) Power
Q10. SI unit of power is:
A) Joule
B) Newton
C) Watt
D) Pascal
Answer: C) Watt
Q11. One watt is equal to:
A) 1 J/s
B) 1 N/s
C) 1 kg·m
D) 1 J·s
Answer: A) 1 J/s
Q12. Formula for power is:
A) P = W × t
B) P = W/t
C) P = F × t
D) P = m × a
Answer: B) P = W/t
Q13. A machine does 600 J of work in 2 s. Its power is:
A) 1200 W
B) 600 W
C) 300 W
D) 150 W
Answer: C) 300 W
Q14. Energy is the ability to:
A) Produce force
B) Do work
C) Increase mass
D) Reduce pressure
Answer: B) Do work
Q15. SI unit of energy is:
A) Watt
B) Joule
C) Newton
D) Volt
Answer: B) Joule
Q16. The energy possessed by a body due to its motion is called:
A) Potential energy
B) Thermal energy
C) Kinetic energy
D) Chemical energy
Answer: C) Kinetic energy
Q17. Formula of kinetic energy is:
A) KE = mv²
B) KE = ½mv²
C) KE = mg
D) KE = mgh²
Answer: B) KE = ½mv²
Q18. A 2 kg object moving at 4 m/s has kinetic energy:
A) 8 J
B) 16 J
C) 32 J
D) 64 J
Answer: B) 16 J
Q19. The energy possessed due to position is called:
A) Kinetic energy
B) Heat energy
C) Potential energy
D) Sound energy
Answer: C) Potential energy
Q20. Formula for gravitational potential energy is:
A) PE = mv²
B) PE = mgh
C) PE = Fd
D) PE = Pt
Answer: B) PE = mgh
Q21. A body of mass 5 kg is raised to a height of 10 m. Taking g = 10 m/s², its potential energy is:
A) 50 J
B) 100 J
C) 500 J
D) 1000 J
Answer: C) 500 J
Q22. The commercial unit of electrical energy is:
A) Joule
B) Watt
C) Kilowatt-hour
D) Newton
Answer: C) Kilowatt-hour
Q23. One kilowatt-hour equals:
A) 3.6 × 10⁶ J
B) 3600 J
C) 1000 J
D) 60 J
Answer: A) 3.6 × 10⁶ J
Q24. Which law states that energy can neither be created nor destroyed?
A) Newton’s First Law
B) Law of Gravitation
C) Law of Conservation of Energy
D) Boyle’s Law
Answer: C) Law of Conservation of Energy
Q25. Which quantity has the same unit as work?
A) Power
B) Force
C) Energy
D) Pressure
Answer: C) Energy
Q26. If force and displacement are opposite in direction, work done is:
A) Positive
B) Negative
C) Zero
D) Infinite
Answer: B) Negative
Q27. Which is not a form of energy?
A) Chemical energy
B) Heat energy
C) Sound energy
D) Density
Answer: D) Density
Q28. The unit horsepower is used to measure:
A) Force
B) Energy
C) Power
D) Work
Answer: C) Power
Q29. One horsepower is approximately equal to:
A) 100 W
B) 746 W
C) 1000 W
D) 1500 W
Answer: B) 746 W
Q30. Which device converts electrical energy into mechanical energy?
A) Generator
B) Motor
C) Battery
D) Transformer
Answer: B) Motor
Q31. Which energy is stored in food?
A) Heat energy
B) Chemical energy
C) Sound energy
D) Nuclear energy
Answer: B) Chemical energy
Q32. Which energy transformation occurs in a hydroelectric power station?
A) Chemical → Heat
B) Kinetic → Electrical
C) Electrical → Mechanical
D) Heat → Light
Answer: B) Kinetic → Electrical
Q33. A body at rest possesses:
A) Kinetic energy only
B) Potential energy only
C) No energy
D) Both kinetic and potential energy
Answer: B) Potential energy only
Q34. A force of 20 N acts on an object for 4 m. Work done is:
A) 5 J
B) 24 J
C) 80 J
D) 100 J
Answer: C) 80 J
Q35. A machine performs 1200 J of work in 4 s. Power developed is:
A) 300 W
B) 400 W
C) 600 W
D) 1200 W
Answer: A) 300 W
Q36. A 1 kg body moving at 10 m/s has kinetic energy:
A) 25 J
B) 50 J
C) 100 J
D) 200 J
Answer: B) 50 J
Q37. Which form of energy is associated with a stretched spring?
A) Kinetic energy
B) Elastic potential energy
C) Heat energy
D) Sound energy
Answer: B) Elastic potential energy
Q38. If the velocity of a body doubles, its kinetic energy becomes:
A) Half
B) Double
C) Four times
D) Eight times
Answer: C) Four times
Q39. The dimension of work is:
A) ML²T⁻²
B) MLT⁻²
C) MLT⁻¹
D) MLT⁻³
Answer: A) ML²T⁻²
Q40. Which quantity is measured in joules?
A) Pressure
B) Force
C) Work
D) Acceleration
Answer: C) Work
Q41. A person lifts a 10 N load through 2 m. Work done is:
A) 5 J
B) 10 J
C) 20 J
D) 40 J
Answer: C) 20 J
Q42. Power is directly proportional to:
A) Time
B) Work done
C) Distance only
D) Mass only
Answer: B) Work done
Q43. Which quantity depends on speed?
A) Potential energy
B) Kinetic energy
C) Mass
D) Density
Answer: B) Kinetic energy
Q44. In free fall, potential energy converts into:
A) Heat energy
B) Chemical energy
C) Kinetic energy
D) Sound energy
Answer: C) Kinetic energy
Q45. A body of mass 3 kg at height 5 m (g = 10 m/s²) has potential energy:
A) 15 J
B) 30 J
C) 150 J
D) 300 J
Answer: C) 150 J
Q46. Which energy source is renewable?
A) Coal
B) Oil
C) Solar energy
D) Natural gas
Answer: C) Solar energy
Q47. The watt is named after:
A) James Watt
B) Isaac Newton
C) Albert Einstein
D) Michael Faraday
Answer: A) James Watt
Q48. If no displacement occurs, work done is:
A) Infinite
B) Positive
C) Zero
D) Negative
Answer: C) Zero
Q49. Which of the following is an example of kinetic energy?
A) Water stored in a dam
B) A moving car
C) A stretched bow
D) A compressed spring
Answer: B) A moving car
Q50. Energy transformation in an electric bulb is:
A) Electrical → Heat and Light
B) Chemical → Mechanical
C) Heat → Electrical
D) Mechanical → Nuclear
Answer: A) Electrical → Heat and Light
Q51. Which of the following is a unit of power?
A) Joule
B) Newton
C) Watt
D) Pascal
Answer: C) Watt
Q52. A force of 15 N moves an object through 3 m. Work done is:
A) 5 J
B) 18 J
C) 45 J
D) 60 J
Answer: C) 45 J
Q53. Which quantity remains conserved in all physical processes?
A) Mass only
B) Energy
C) Velocity
D) Force
Answer: B) Energy
Q54. Energy stored in a battery is:
A) Electrical energy
B) Chemical energy
C) Sound energy
D) Nuclear energy
Answer: B) Chemical energy
Q55. Which device converts mechanical energy into electrical energy?
A) Electric motor
B) Generator
C) Heater
D) Battery
Answer: B) Generator
Q56. If a machine does 500 J work in 10 s, its power is:
A) 25 W
B) 50 W
C) 100 W
D) 500 W
Answer: B) 50 W
Q57. Kinetic energy depends upon:
A) Mass only
B) Velocity only
C) Mass and velocity
D) Height only
Answer: C) Mass and velocity
Q58. A body of mass 4 kg moving with 5 m/s possesses kinetic energy:
A) 25 J
B) 40 J
C) 50 J
D) 75 J
Answer: C) 50 J
Q59. Potential energy depends upon:
A) Mass, gravity and height
B) Speed only
C) Time only
D) Force only
Answer: A) Mass, gravity and height
Q60. The dimensional formula of power is:
A) ML²T⁻²
B) MLT⁻²
C) ML²T⁻³
D) MLT⁻¹
Answer: C) ML²T⁻³
Q61. Which quantity is vector in nature?
A) Work
B) Energy
C) Power
D) Force
Answer: D) Force
Q62. A machine of power 200 W works for 5 s. Work done is:
A) 40 J
B) 100 J
C) 500 J
D) 1000 J
Answer: D) 1000 J
Q63. If displacement is zero, work done will be:
A) Infinite
B) Positive
C) Zero
D) Negative
Answer: C) Zero
Q64. The unit kilowatt-hour is used for measuring:
A) Force
B) Power
C) Energy
D) Current
Answer: C) Energy
Q65. Which form of energy is present in flowing water?
A) Chemical energy
B) Potential energy
C) Kinetic energy
D) Nuclear energy
Answer: C) Kinetic energy
Q66. One kilowatt equals:
A) 10 W
B) 100 W
C) 1000 W
D) 10000 W
Answer: C) 1000 W
Q67. A body of 10 kg is raised by 4 m. Taking g = 10 m/s², potential energy gained is:
A) 40 J
B) 100 J
C) 200 J
D) 400 J
Answer: D) 400 J
Q68. Which energy transformation occurs in a loudspeaker?
A) Sound to electrical
B) Electrical to sound
C) Mechanical to nuclear
D) Heat to electrical
Answer: B) Electrical to sound
Q69. Which quantity is measured in watt-hour?
A) Energy
B) Force
C) Power
D) Pressure
Answer: A) Energy
Q70. Which one is an example of potential energy?
A) Moving bullet
B) Flowing river
C) Raised hammer
D) Running fan
Answer: C) Raised hammer
Q71. Work done against gravity is stored as:
A) Heat energy
B) Potential energy
C) Sound energy
D) Nuclear energy
Answer: B) Potential energy
Q72. If mass becomes double and speed remains same, kinetic energy becomes:
A) Half
B) Double
C) Four times
D) Unchanged
Answer: B) Double
Q73. The energy possessed by compressed spring is:
A) Kinetic energy
B) Elastic potential energy
C) Heat energy
D) Sound energy
Answer: B) Elastic potential energy
Q74. Which quantity is not a form of energy?
A) Light energy
B) Electrical energy
C) Force
D) Chemical energy
Answer: C) Force
Q75. A machine of 1000 W works for 20 s. Work done is:
A) 5000 J
B) 10000 J
C) 20000 J
D) 40000 J
Answer: C) 20000 J
Q76. Which energy is associated with motion of molecules?
A) Heat energy
B) Nuclear energy
C) Potential energy
D) Sound energy
Answer: A) Heat energy
Q77. A force of 50 N acts over 2 m. Work done is:
A) 25 J
B) 50 J
C) 100 J
D) 150 J
Answer: C) 100 J
Q78. A moving train possesses:
A) Potential energy only
B) Kinetic energy only
C) Heat energy only
D) Chemical energy only
Answer: B) Kinetic energy only
Q79. Energy conversion in a torch is:
A) Chemical to electrical to light
B) Light to heat
C) Heat to electrical
D) Mechanical to light
Answer: A) Chemical to electrical to light
Q80. One joule is equivalent to:
A) One watt per second
B) One newton metre
C) One kilogram metre
D) One ampere volt
Answer: B) One newton metre
Q81. The power of a person who performs 1500 J work in 30 s is:
A) 25 W
B) 50 W
C) 75 W
D) 100 W
Answer: B) 50 W
Q82. The work done by frictional force is generally:
A) Positive
B) Negative
C) Zero
D) Infinite
Answer: B) Negative
Q83. Which source of energy is non-renewable?
A) Wind energy
B) Solar energy
C) Coal
D) Hydroelectric energy
Answer: C) Coal
Q84. If velocity becomes three times, kinetic energy becomes:
A) Three times
B) Six times
C) Nine times
D) Twenty-seven times
Answer: C) Nine times
Q85. Which instrument measures electrical energy consumption?
A) Ammeter
B) Voltmeter
C) Energy meter
D) Galvanometer
Answer: C) Energy meter
Q86. Which of the following is renewable energy?
A) Petroleum
B) Natural gas
C) Coal
D) Wind energy
Answer: D) Wind energy
Q87. The unit horsepower is larger than:
A) Watt
B) Joule
C) Newton
D) Pascal
Answer: A) Watt
Q88. A body of mass 8 kg at height 2 m has potential energy (g = 10 m/s²):
A) 16 J
B) 80 J
C) 160 J
D) 320 J
Answer: C) 160 J
Q89. Energy transformation in a fan is:
A) Mechanical to electrical
B) Electrical to mechanical
C) Heat to electrical
D) Sound to electrical
Answer: B) Electrical to mechanical
Q90. Work done by centripetal force is:
A) Positive
B) Negative
C) Zero
D) Infinite
Answer: C) Zero
Q91. Which quantity is the product of force and displacement?
A) Momentum
B) Power
C) Work
D) Pressure
Answer: C) Work
Q92. The SI unit of mechanical energy is:
A) Watt
B) Joule
C) Newton
D) Pascal
Answer: B) Joule
Q93. Which energy conversion occurs in photosynthesis?
A) Electrical to chemical
B) Light to chemical
C) Heat to sound
D) Mechanical to heat
Answer: B) Light to chemical
Q94. A 3 kg object moving with velocity 6 m/s has kinetic energy:
A) 18 J
B) 36 J
C) 54 J
D) 72 J
Answer: C) 54 J
Q95. The total mechanical energy of an isolated system remains:
A) Increasing
B) Decreasing
C) Constant
D) Zero
Answer: C) Constant
Q96. The product of power and time gives:
A) Force
B) Energy or Work
C) Acceleration
D) Pressure
Answer: B) Energy or Work
Q97. Which type of energy is found in fuels?
A) Kinetic energy
B) Chemical energy
C) Heat energy
D) Sound energy
Answer: B) Chemical energy
Q98. A machine with power 500 W works for 8 s. Work done is:
A) 400 J
B) 1000 J
C) 2000 J
D) 4000 J
Answer: D) 4000 J
Q99. Which of the following is an example of the law of conservation of energy?
A) Falling object converting PE into KE
B) Expansion of gas
C) Reflection of light
D) Refraction of light
Answer: A) Falling object converting PE into KE
Q100. The sum of kinetic energy and potential energy of a body is called:
A) Heat energy
B) Chemical energy
C) Mechanical energy
D) Nuclear energy
Answer: C) Mechanical energy