Work done against gravity in lifting a 5 kg mass through 2 m (g=10) is MCQ with Answer and Explanation

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Work done against gravity in lifting a 5 kg mass through 2 m (g=10) is

A. 25 J

B. 100 J

C. 50 J

D. 10 J

Answer: Option B

Solution (By JKSSB Mock Tests)

W = mgh = 5×10×2 = 100 J.

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A radioactive nucleus emits a beta particle. Its atomic number

A. Decreases by 1

B. Increases by 1

C. Decreases by 2

D. Remains same

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Correct Answer: Option B

Explanation:
β⁻ decay: neutron → proton + electron, Z increases by 1.

This question belongs to: Science Physics

Question #2

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The escape velocity from Earth does not depend on

A. Universal gravitational constant

B. Radius of Earth

C. Mass of Earth

D. Mass of the object

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Correct Answer: Option D

Explanation:
v_esc = √(2GM/R), independent of m. Heavier object needs more energy, but velocity same. All objects fall at same rate. Important concept.

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Question #3

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A tuning fork of frequency 256 Hz is sounded. In 1 second, number of compressions produced is

A. 256

B. 512

C. 1

D. 128

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Correct Answer: Option A

Explanation:
Each cycle produces one compression. 256 cycles, 256 compressions.

This question belongs to: Science Physics

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