Escape velocity from a planet depends on MCQ with Answer and Explanation

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Escape velocity from a planet depends on

A. Mass of escaping body

B. Mass and radius of planet

C. Density of atmosphere

D. Radius of planet only

Answer: Option B

Solution (By JKSSB Mock Tests)

v_esc = √(2GM/R), depends on planet's mass and radius, not body's mass.

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Question #1

A car moving at constant velocity of 10 m/s has net force acting on it equal to

A. Frictional force

B. Zero

C. Force of engine

D. Weight of car

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Correct Answer: Option B

Explanation:
Constant velocity implies zero acceleration, net force = 0 by Newton's first law. Engine force balances friction and air resistance. Net force zero, not necessarily zero forces.

This question belongs to: Science Physics

Question #2

A vibrating tuning fork produces sound waves. These waves are

A. Longitudinal

B. Transverse

C. Electromagnetic

D. Stationary

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Correct Answer: Option A

Explanation:
Sound in air is longitudinal.

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Question #3

Which of the following is a vector?

A. Distance

B. Energy

C. Speed

D. Displacement

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Correct Answer: Option D

Explanation:
Displacement has both magnitude and direction, vector. Distance is scalar (path length). Speed scalar. Energy scalar. Vector examples: velocity, force, acceleration.

This question belongs to: Science Physics

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