A 5 kg object is moving with 2 m/s. Its momentum is MCQ with Answer and Explanation

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A 5 kg object is moving with 2 m/s. Its momentum is

A. 10 kg m/s

B. 2.5 kg m/s

C. 0.4 kg m/s

D. 7 kg m/s

Answer: Option A

Solution (By JKSSB Mock Tests)

p = m v = 5 × 2 = 10 kg m/s. Direction same as velocity. Momentum vector. Unit kg·m/s.

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Question #1

The pitch of a sound becomes higher if

A. Speed decreases

B. Frequency increases

C. Amplitude increases

D. Wavelength increases

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Correct Answer: Option B

Explanation:
Higher frequency → higher pitch. Amplitude increases loudness. Wavelength inversely proportional to frequency (v constant). So increasing frequency increases pitch.

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Question #2

The rate of change of momentum is equal to

A. Power

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Correct Answer: Option C

Explanation:
F = dp/dt (Newton's second law original form). Impulse is Δp. Work F·s. Power dW/dt.

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Question #3

Binding energy per nucleon peaks at:

A. Helium

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Correct Answer: Option B

Explanation:
Maximum binding energy/nucleon ≈ 8.8 MeV at iron-56, making it most stable. Lighter nuclei release energy via fusion; heavier via fission. Memory tip: 'Iron peak: most stable nucleus; fusion before, fission after'. Nuclear physics concept frequently tested in competitive exams.

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