The kinetic energy of a body becomes 4 times. Momentum becomes MCQ with Answer and Explanation

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The kinetic energy of a body becomes 4 times. Momentum becomes

A. 4 times

B. Same

C. 2 times

D. 16 times

Answer: Option C

Solution (By JKExamLibrary)

p ∝ √K, so if K'=4K, p'=2p.

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Question #1

In an electric circuit, ammeter is connected in

A. Parallel

B. Either

C. Series

D. Across load

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Correct Answer: Option C

Explanation:
Ammeter must be in series to measure full current. Very low internal resistance.

This question belongs to: Science Physics

Question #2

A radioactive nucleus emits a beta particle. Its mass number

A. Decreases by 1

B. Decreases by 2

C. Remains unchanged

D. Increases by 1

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Correct Answer: Option C

Explanation:
β⁻ decay: n → p + e⁻, so A unchanged, Z increases by 1.

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Question #3

Wave speed v = 300 m/s, frequency f = 150 Hz. Wavelength λ is:

A. 150 m

B. 45000 m

C. 0.5 m

D. 2 m

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Correct Answer: Option D

Explanation:
v = fλ ⇒ λ = v/f = 300/150 = 2 m. Universal wave equation application. Memory tip: 'λ = v/f; units: m/s ÷ Hz = m'. Basic wave property calculation frequently tested in competitive exams to verify formula application.

This question belongs to: Science Physics

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