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Question (11)

QN006372

Commercial unit of electrical energy is:

(A) Joule
(B) Watt
(C) Kilowatt-hour
(D) Newton

Correct Answer: C

Explanation:

Commercial unit is kWh.

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Question (12)

QN006373

A machine with greater power can:

(A) Do less work
(B) Do work more slowly
(C) Do work more quickly
(D) Stop work completely

Correct Answer: C

Explanation:

Greater power means faster work.

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Question (13)

QN006374

A pump lifts water doing 5000 J work in 25 s. Power developed is:

(A) 20 W
(B) 200 W
(C) 500 W
(D) 125 W

Correct Answer: B

Explanation:

Power = 5000 ÷ 25 = 200 W

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Question (14)

QN006375

1 kilowatt equals:

(A) 10 W
(B) 100 W
(C) 1000 W
(D) 10000 W

Correct Answer: C

Explanation:

1 kW = 1000 W

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Question (15)

QN006376

A crane does 9000 J work in 30 s. Its power is:

(A) 90 W
(B) 300 W
(C) 270000 W
(D) 30 W

Correct Answer: B

Explanation:

Power = 9000 ÷ 30 = 300 W

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Question (16)

QN006377

Which relation is correct?

(A) Power = Work × Time
(B) Power = Work / Time
(C) Power = Force / Time
(D) Power = Mass × Velocity

Correct Answer: B

Explanation:

Power = Work ÷ Time

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Question (17)

QN006378

A worker does the same work in half the time. His power becomes:

(A) Half
(B) Double
(C) Four times
(D) Same

Correct Answer: B

Explanation:

Less time means more power.

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Question (18)

QN006379

A 100 W bulb consumes energy at the rate of:

(A) 1 J/s
(B) 10 J/s
(C) 100 J/s
(D) 1000 J/s

Correct Answer: C

Explanation:

100 W = 100 J/s

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Question (19)

QN006380

A machine develops 2 kW power. In watt, it is:

(A) 20 W
(B) 200 W
(C) 2000 W
(D) 20000 W

Correct Answer: C

Explanation:

2 × 1000 = 2000 W

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Question (20)

QN006381

Two students do equal work, but one takes less time. That student has:

(A) Less power
(B) Greater power
(C) Zero power
(D) Equal mass

Correct Answer: B

Explanation:

Power increases when time decreases.

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Question (11)

Commercial unit of electrical energy is:

Explanation:

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Question (12)

A machine with greater power can:

Explanation:

Link:

Question (13)

A pump lifts water doing 5000 J work in 25 s. Power developed is:

Explanation:

Link:

Question (14)

1 kilowatt equals:

Explanation:

Link:

Question (15)

A crane does 9000 J work in 30 s. Its power is:

Explanation:

Link:

Question (16)

Which relation is correct?

Explanation:

Link:

Question (17)

A worker does the same work in half the time. His power becomes:

Explanation:

Link:

Question (18)

A 100 W bulb consumes energy at the rate of:

Explanation:

Link:

Question (19)

A machine develops 2 kW power. In watt, it is:

Explanation:

Link:

Question (20)

Two students do equal work, but one takes less time. That student has:

Explanation:

Link:

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