A body moves along a straight line with v = 2t + 3. Acceleration after 2 s is MCQ with Answer and Explanation

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A body moves along a straight line with v = 2t + 3. Acceleration after 2 s is

A. 5 m/s²

B. 2 m/s²

C. 3 m/s²

D. 7 m/s²

Answer: Option B

Solution (By JKSSB Mock Tests)

a = dv/dt = 2, constant.

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Question #1

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The rate of change of displacement is

A. Velocity

B. Acceleration

C. Speed

D. Momentum

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Correct Answer: Option A

Explanation:
Velocity = d(displacement)/dt. Speed is rate of change of distance.

This question belongs to: Science Physics

Question #2

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The force that binds nucleons in a nucleus is

A. Gravitational

B. Electrostatic

C. Weak nuclear force

D. Strong nuclear force

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Correct Answer: Option D

Explanation:
Strong nuclear force, short range, attractive.

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Question #3

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A block of mass 5 kg is pushed against a wall with a horizontal force of 50 N. Coefficient of friction 0.4. The block (g=10)

A. Moves sideways

B. Falls down

C. Stays at rest

D. Moves up

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Correct Answer: Option B

Explanation:
Weight = 50 N. Max static friction = μN = 0.4×50 = 20 N, insufficient to hold. So block slides down.

This question belongs to: Science Physics

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