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Question (1)

QN006362

Power is defined as:

(A) Work done × time
(B) Work done per unit time
(C) Force × displacement
(D) Energy × velocity

Correct Answer: B

Explanation:

Power = Work ÷ Time

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Question (2)

QN006363

The SI unit of power is:

(A) Joule
(B) Newton
(C) Watt
(D) Pascal

Correct Answer: C

Explanation:

SI unit of power is watt.

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Question (3)

QN006364

One watt power means:

(A) 1 J work done in 1 minute
(B) 1 J work done in 1 second
(C) 1 N force in 1 second
(D) 1 m displacement in 1 second

Correct Answer: B

Explanation:

1 watt = 1 joule per second.

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Question (4)

QN006365

A machine does 600 J work in 3 s. Its power is:

(A) 200 W
(B) 1800 W
(C) 603 W
(D) 20 W

Correct Answer: A

Explanation:

Power = 600 ÷ 3 = 200 W

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Question (5)

QN006366

A boy lifts a load doing 500 J work in 10 s. Power developed is:

(A) 5 W
(B) 50 W
(C) 5000 W
(D) 510 W

Correct Answer: B

Explanation:

Power = 500 ÷ 10 = 50 W

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Question (6)

QN006367

Which quantity measures the rate of doing work?

(A) Energy
(B) Force
(C) Power
(D) Momentum

Correct Answer: C

Explanation:

Power measures rate of doing work.

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Question (7)

QN006368

A motor does 2400 J work in 8 s. Calculate its power.

(A) 300 W
(B) 240 W
(C) 19200 W
(D) 30 W

Correct Answer: A

Explanation:

Power = 2400 ÷ 8 = 300 W

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Question (8)

QN006369

Which device rating is expressed in watt?

(A) Speedometer
(B) Electric bulb
(C) Thermometer
(D) Ammeter

Correct Answer: B

Explanation:

Electrical appliances are rated in watt.

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Question (9)

QN006370

A person performs 1200 J work in 2 minutes. Power is:

(A) 10 W
(B) 100 W
(C) 600 W
(D) 2400 W

Correct Answer: A

Explanation:

Time = 120 s; Power = 1200 ÷ 120 = 10 W

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Question (10)

QN006371

Exact definition: “Power is the rate of”

(A) Momentum change
(B) Doing work
(C) Force production
(D) Acceleration increase

Correct Answer: B

Explanation:

Power is the rate of doing work.

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Question (1)

Power is defined as:

Explanation:

Link:

Question (2)

The SI unit of power is:

Explanation:

Link:

Question (3)

One watt power means:

Explanation:

Link:

Question (4)

A machine does 600 J work in 3 s. Its power is:

Explanation:

Link:

Question (5)

A boy lifts a load doing 500 J work in 10 s. Power developed is:

Explanation:

Link:

Question (6)

Which quantity measures the rate of doing work?

Explanation:

Link:

Question (7)

A motor does 2400 J work in 8 s. Calculate its power.

Explanation:

Link:

Question (8)

Which device rating is expressed in watt?

Explanation:

Link:

Question (9)

A person performs 1200 J work in 2 minutes. Power is:

Explanation:

Link:

Question (10)

Exact definition: “Power is the rate of”

Explanation:

Link:

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