The working of a rocket is based on MCQ with Answer and Explanation

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The working of a rocket is based on

A. Conservation of energy

B. Newton's first law

C. Law of gravitation

D. Conservation of linear momentum

Answer: Option D

Solution (By JKSSB Mock Tests)

Rocket propulsion: momentum of exhaust gases equals momentum gained by rocket.

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Practice More Physics Questions

Question #1

The speed of sound in air at 0°C is approximately

A. 300 m/s

B. 350 m/s

C. 330 m/s

D. 340 m/s

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Correct Answer: Option C

Explanation:
At 0°C, speed ~ 331 m/s. At room temperature (20°C) ~ 343 m/s, often taken as 340. Increases with temperature v ∝ √T. For many problems 340 is used, but at 0°C it's 331. So option A.

This question belongs to: Science Physics

Question #2

The weight of a body on a planet is 100 N. If planet's radius is half and density same as Earth, weight becomes

A. 100 N

B. 25 N

C. 50 N

D. 200 N

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Correct Answer: Option C

Explanation:
g = GM/R² = G (ρ 4/3 π R³)/R² ∝ ρ R. If radius half, density same, g becomes half. Weight half = 50 N.

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Question #3

Radioactivity was discovered by

A. Curie

B. Rutherford

C. Roentgen

D. Becquerel

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Correct Answer: Option D

Explanation:
Henri Becquerel discovered natural radioactivity in uranium salts (1896). Curie isolated radium, Rutherford classified rays.

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