A gun recoils on firing because of MCQ with Answer and Explanation

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A gun recoils on firing because of

A. Law of inertia

B. Conservation of mass

C. Newton's third law

D. Conservation of energy

Answer: Option C

Solution (By JKSSB Mock Tests)

Action (bullet forward) and reaction (gun backward). Also momentum conservation.

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Practice More Physics Questions

Question #1

Which of the following is the dimensional formula of impulse?

A. [ML²T⁻¹]

B. [M⁰LT⁻¹]

C. [MLT⁻¹]

D. [MLT⁻²]

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Correct Answer: Option C

Explanation:
Impulse = Force × time = change in momentum. Momentum = mass × velocity, dimensions [M][LT⁻¹] = [MLT⁻¹]. Force dimensions [MLT⁻²], multiplied by time gives [MLT⁻¹]. Same as momentum.

This question belongs to: Science Physics

Question #2

The process of a solid changing directly into gas is

A. Melting

B. Condensation

C. Evaporation

D. Sublimation

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Correct Answer: Option D

Explanation:
Sublimation: solid → gas. Example: dry ice (CO₂), camphor. Deposition is reverse (gas → solid). Melting solid → liquid, evaporation liquid → gas.

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Question #3

The greenhouse effect is mainly due to increase in

A. Argon

B. Nitrogen

C. Carbon dioxide

D. Oxygen

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Correct Answer: Option C

Explanation:
CO2, methane trap heat.

This question belongs to: Science Physics

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