JEE (Main) Physics - Work, Energy and Power Multiple Choice Questions (MCQs)

JEE (Main) Physics - Work, Energy and Power Multiple Choice Questions (MCQs)

1. The work done by a force acting on a body is defined as:
   • a) The product of force and displacement
   • b) The product of force and time
   • c) The rate of change of energy
   • d) The change in velocity of the body
   Answer: a) The product of force and displacement
2. The unit of work in the International System of Units (SI) is:
   • a) Joule
   • b) Newton
   • c) Watt
   • d) Meter
   Answer: a) Joule
3. If a force of 10 N displaces an object by 5 meters in the direction of the force, the work done is:
   • a) 50 J
   • b) 10 J
   • c) 5 J
   • d) 100 J
   Answer: a) 50 J
4. Work is said to be done when:
   • a) The body moves in the direction of the applied force
   • b) There is a change in velocity
   • c) The body is accelerated
   • d) There is no displacement
   Answer: a) The body moves in the direction of the applied force
5. Kinetic energy of a body is directly proportional to:
   • a) Its mass
   • b) The square of its velocity
   • c) Its speed
   • d) Its displacement
   Answer: b) The square of its velocity
6. The work-energy theorem states that:
   • a) Work done is equal to the change in energy
   • b) Work done is equal to the square of the velocity
   • c) Energy is always conserved
   • d) Kinetic energy is always constant
   Answer: a) Work done is equal to the change in energy
7. A body of mass 2 kg moves with a velocity of 3 m/s. The kinetic energy of the body is:
   • a) 9 J
   • b) 18 J
   • c) 3 J
   • d) 4.5 J
   Answer: b) 18 J
8. Potential energy is the energy possessed by a body due to its:
   • a) Motion
   • b) Position
   • c) Mass
   • d) Shape
   Answer: b) Position
9. A force acts on a body for 2 seconds and imparts a change in velocity of 6 m/s. If the mass of the body is 3 kg, the power developed is:
   • a) 12 W
   • b) 6 W
   • c) 18 W
   • d) 36 W
   Answer: a) 12 W
10. The power required to lift a body of mass 10 kg with a velocity of 2 m/s is:
    • a) 20 W
    • b) 10 W
    • c) 40 W
    • d) 80 W
    Answer: a) 20 W
11. The work done in lifting an object vertically is:
    • a) Negative, as gravity opposes the motion
    • b) Zero, as the displacement is zero
    • c) Positive, as the displacement is upward
    • d) Zero, as there is no force acting
    Answer: c) Positive, as the displacement is upward
12. If the velocity of an object is doubled, its kinetic energy becomes:
    • a) Half
    • b) Double
    • c) Four times
    • d) Remains the same
    Answer: c) Four times
13. The SI unit of power is:
    • a) Joule
    • b) Newton
    • c) Watt
    • d) Ampere
    Answer: c) Watt
14. The potential energy of an object is given by the formula:
    • a) \( PE = \frac{1}{2} m v^2 \)
    • b) \( PE = m g h \)
    • c) \( PE = m g v \)
    • d) \( PE = \frac{1}{2} m g \)
    Answer: b) \( PE = m g h \)
15. A body of mass 4 kg is moving with a velocity of 3 m/s. The work done to bring it to rest is:
    • a) 18 J
    • b) 24 J
    • c) 36 J
    • d) 12 J
    Answer: b) 24 J

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