NEET Physics: power Practice Questions
12 free multiple-choice questions on power (Work, Energy, and Power) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. The SI unit of power is:
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Correct answer: A — Watt
Power is the rate of doing work, and its SI unit is the Watt (W), which is equivalent to Joule per second (J/s).
Q2. Which of the following physical quantities is directly related to the rate at which energy is transferred or converted?
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Correct answer: C — Power
Power is fundamentally the rate of doing work or the rate of energy transfer.
Q3. A motor is capable of doing 500 Joules of work in 20 seconds. Calculate the power developed by the motor.
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Correct answer: D — 250 Watts
Power (P) = Work (W) / Time (t). P = 500 J / 20 s = 25 W.
Q4. If a machine performs 100 Joules of work in 10 seconds, what is the power delivered by the machine?
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Correct answer: B — 100 W
Power = Work / Time. Power = 100 J / 10 s = 10 W.
Q5. If the force applied in a given direction remains constant, the power exerted depends directly on the object's:
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Correct answer: B — Velocity
Power P = Fv. If F is constant, P is directly proportional to v (velocity).
Q6. Power is defined as the rate of doing work. Which of the following is the mathematical expression for power?
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Correct answer: D — P = W/t
Power (P) is calculated by dividing the work done (W) by the time taken (t), hence P = W/t.
Q7. A motor lifts a load of 500 N vertically upwards in 10 seconds. If the work done is 5000 Joules, the power consumed by the motor is:
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Correct answer: A — 500 W
Power is calculated as Work done divided by the time taken (P = W/t). Here, P = 5000 J / 10 s = 500 W.
Q8. If a constant force is applied to an object, and the object moves with a constant velocity, the power delivered to the object is:
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Correct answer: C — Zero or constant (depending on motion)
Power (P) is calculated as Force (F) multiplied by velocity (v) in the direction of motion (P = Fv). If the force and velocity are constant, the power delivered is constant.
Q9. The rate at which energy is transferred or converted is known as:
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Correct answer: B — Power
Power is fundamentally the rate of doing work or the rate of energy transfer, defined as the work done per unit time.
Q10. Which physical quantity is measured in Watts?
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Correct answer: A — Power
Watts are the standard unit for measuring power, which is the rate at which energy is transferred or work is done.
Q11. If the power supplied by an electric bulb is halved, and the time taken to complete the same work remains the same, the new energy consumed will be:
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Correct answer: D — Halved
Energy (E) is directly proportional to Power (P) when time (t) is constant (E=Pt). If P is halved, E is also halved.
Q12. Work done is defined as the product of force and displacement. Power is defined as the rate of doing work. If an object does 100 Joules of work in 10 seconds, what is the power delivered?
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Correct answer: C — 10 Watts
Power (P) = Work (W) / Time (t). P = 100 J / 10 s = 10 J/s = 10 Watts.
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