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Question (41)

QN006402

A water pump of 1000 W operates for 5 s. Energy transferred is:

(A) 500 J
(B) 5000 J
(C) 1000 J
(D) 200 J

Correct Answer: B

Explanation:

Energy = 1000 × 5 = 5000 J

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Question (42)

QN006403

A student carrying books upstairs quickly develops more power because:

(A) Work done increases
(B) Time taken decreases
(C) Mass decreases
(D) Gravity decreases

Correct Answer: B

Explanation:

Less time means greater power.

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Question (43)

QN006404

A 5 kW machine works for 2 s. Work done is:

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

Correct Answer: D

Explanation:

Work = 5000 × 2 = 10000 J

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Question (44)

QN006405

Which of the following has least power rating?

(A) Electric iron
(B) Refrigerator
(C) LED lamp
(D) Geyser

Correct Answer: C

Explanation:

LED lamps consume least power.

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Question (45)

QN006406

If power doubles and time remains same, work done becomes:

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

Correct Answer: B

Explanation:

Work = Power × Time

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Question (46)

QN006407

A person develops 100 W power while climbing stairs. Work done in 20 s is:

(A) 5 J
(B) 50 J
(C) 2000 J
(D) 120 J

Correct Answer: C

Explanation:

Work = 100 × 20 = 2000 J

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Question (47)

QN006408

The faster an appliance converts energy, the greater its:

(A) Mass
(B) Momentum
(C) Power
(D) Displacement

Correct Answer: C

Explanation:

Faster energy conversion means more power.

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Question (48)

QN006409

A machine does 5400 J work in 9 s. Calculate power.

(A) 60 W
(B) 600 W
(C) 540 W
(D) 48600 W

Correct Answer: B

Explanation:

Power = 5400 ÷ 9 = 600 W

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Question (49)

QN006410

Which unit is bigger?

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

Correct Answer: B

Explanation:

1 kilowatt = 1000 watt.

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Question (50)

QN006411

A cyclist produces 400 J work in 5 s. Power developed is:

(A) 20 W
(B) 40 W
(C) 80 W
(D) 2000 W

Correct Answer: C

Explanation:

Power = 400 ÷ 5 = 80 W

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Question (41)

A water pump of 1000 W operates for 5 s. Energy transferred is:

Explanation:

Link:

Question (42)

A student carrying books upstairs quickly develops more power because:

Explanation:

Link:

Question (43)

A 5 kW machine works for 2 s. Work done is:

Explanation:

Link:

Question (44)

Which of the following has least power rating?

Explanation:

Link:

Question (45)

If power doubles and time remains same, work done becomes:

Explanation:

Link:

Question (46)

A person develops 100 W power while climbing stairs. Work done in 20 s is:

Explanation:

Link:

Question (47)

The faster an appliance converts energy, the greater its:

Explanation:

Link:

Question (48)

A machine does 5400 J work in 9 s. Calculate power.

Explanation:

Link:

Question (49)

Which unit is bigger?

Explanation:

Link:

Question (50)

A cyclist produces 400 J work in 5 s. Power developed is:

Explanation:

Link:

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