The product of force and time is called MCQ with Answer and Explanation

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The product of force and time is called

A. Power

B. Work

C. Impulse

D. Energy

Answer: Option C

Solution (By JKSSB Mock Tests)

Impulse = F Δt.

This question belongs to: Science Physics

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Question #1

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A transformer has 400 primary turns and 100 secondary turns. If primary voltage is 220 V, secondary voltage is

A. 110 V

B. 440 V

C. 880 V

D. 55 V

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Correct Answer: Option D

Explanation:
Vs/Vp = Ns/Np => Vs = 220 × (100/400) = 55 V. Step-down.

This question belongs to: Science Physics

Question #2

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A sound wave has wavelength 1.7 m and speed 340 m/s. Its frequency is

A. 170 Hz

B. 578 Hz

C. 340 Hz

D. 200 Hz

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Correct Answer: Option D

Explanation:
f = v/λ = 340/1.7 = 200 Hz.

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Question #3

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

A. 40 kg m/s

B. 4000 kg m/s

C. 4 kg m/s

D. 0.4 kg m/s

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Correct Answer: Option C

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

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