The frequency of a wave is 1000 Hz. Its time period is MCQ with Answer and Explanation

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The frequency of a wave is 1000 Hz. Its time period is

A. 0.01 s

B. 1 s

C. 1000 s

D. 0.001 s

Answer: Option D

Solution (By JKSSB Mock Tests)

T = 1/f = 1/1000 = 0.001 s = 1 ms. Millisecond. For higher frequency, period shorter.

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Question #1

A bullet of mass 20 g is fired with velocity 200 m/s. Its momentum is

A. 4000 kg m/s

B. 0.4 kg m/s

C. 40 kg m/s

D. 4 kg m/s

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Correct Answer: Option D

Explanation:
Mass m = 20 g = 0.02 kg. Momentum p = m v = 0.02 × 200 = 4 kg m/s. Always convert mass to kg. Momentum unit kg·m/s.

This question belongs to: Science Physics

Question #2

Which of the following is NOT a unit of pressure?

A. Torr

B. Watt

C. Pascal

D. Bar

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Correct Answer: Option B

Explanation:
Watt is power. Others are pressure units.

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Question #3

A man pushes a wall but fails to move it. Work done is

A. Negative

B. Zero

C. Maximum

D. Positive

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Correct Answer: Option B

Explanation:
Displacement zero, so work zero.

This question belongs to: Science Physics

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