A machine does 500 J of work in 10 seconds. Its power is MCQ with Answer and Explanation

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A machine does 500 J of work in 10 seconds. Its power is

A. 5000 W

B. 50 W

C. 0.5 W

D. 5 W

Answer: Option B

Solution (By JKSSB Mock Tests)

Power = work/time = 500/10 = 50 W. Watt = Joule/second. This is average power. Simple division. Higher power means faster rate of doing work.

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Question #1

The resistance of a conductor is inversely proportional to its

A. Area of cross-section

B. Length

C. Temperature

D. Resistivity

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Correct Answer: Option A

Explanation:
R ∝ 1/A.

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Question #2

An echo is an example of

A. Refraction of sound

B. Reflection of sound

C. Interference of sound

D. Diffraction of sound

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Correct Answer: Option B

Explanation:
Echo is reflected sound.

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Question #3

A 2 kg object is raised to a height of 5 m. The work done against gravity (g=10) is

A. 0 J

B. 100 J

C. 10 J

D. 50 J

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Correct Answer: Option B

Explanation:
Work = mgh = 2 × 10 × 5 = 100 J. Force = mg = 20 N, distance 5 m, work = 20 × 5 = 100 J. This becomes potential energy stored.

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