The SI unit of momentum is MCQ with Answer and Explanation

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The SI unit of momentum is

A. kg m/s

B. N s

C. N/m

D. J s

Answer: Option A

Solution (By JKExamLibrary)

kg m/s, same as impulse unit N s.

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Question #1

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A body falls freely from rest. The ratio of distances covered in 1st, 2nd, and 3rd seconds is

A. 1:4:9

B. 1:1:1

C. 1:3:5

D. 1:2:3

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Correct Answer: Option C

Explanation:
s_nth = u + (g/2)(2n-1). u=0 => s ∝ (2n-1). So 1, 3, 5. Classic kinematic ratio.

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Question #2

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

A. 4000 kg m/s

B. 40 kg m/s

C. 0.4 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.

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Question #3

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An element X has atomic number 17 and mass number 35. Number of neutrons is

A. 18

B. 52

C. 35

D. 17

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Correct Answer: Option A

Explanation:
Neutrons = 35 - 17 = 18 (Chlorine).

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