A force of 20 N acts on a body of mass 4 kg for 5 s. Change in momentum is MCQ with Answer and Explanation

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A force of 20 N acts on a body of mass 4 kg for 5 s. Change in momentum is

A. 4 kg m/s

B. 80 kg m/s

C. 100 kg m/s

D. 20 kg m/s

Answer: Option C

Solution (By JKExamLibrary)

Impulse = F×t = 20×5 = 100 N s = change in momentum.

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Question #1

Which of the following is an SI derived unit named after a scientist?

A. Pascal

B. Metre

C. Second

D. Kilogram

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Correct Answer: Option A

Explanation:
Pascal (Pa) named after Blaise Pascal, derived unit for pressure (N/m²). Metre, kilogram, second are base units. Joule, watt, newton, hertz, coulomb also named scientists.

This question belongs to: Science Physics

Question #2

A wire of resistance R is cut into three equal parts. These parts are then connected in parallel. The equivalent resistance is

A. R

B. R/3

C. 3R

D. R/9

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Correct Answer: Option D

Explanation:
Each part resistance = R/3. Three such in parallel: 1/R_eq = 3/(R/3) = 9/R => R_eq = R/9. For n equal parts cut and connected parallel, R_eq = R/n².

This question belongs to: Science Physics

Question #3

The radius of curvature of a convex mirror of focal length 20 cm is

A. 10 cm

B. 20 cm

C. 40 cm

D. 30 cm

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Correct Answer: Option C

Explanation:
R = 2f = 40 cm. For convex, f positive, R positive.

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