The moment of inertia of a thin rod of mass M and length L about an axis through its centre and perpendicular to length is MCQ with Answer and Explanation

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The moment of inertia of a thin rod of mass M and length L about an axis through its centre and perpendicular to length is

A. ML²/12

B. ML²/2

C. ML²

D. ML²/3

Answer: Option A

Solution (By JKSSB Mock Tests)

I_center = ML²/12. About end = ML²/3.

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Question #1

The unit of latent heat of fusion is

A. J/kg

B. W

C. J

D. J/°C

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Correct Answer: Option A

Explanation:
Latent heat per unit mass, Q = mL => L = Q/m, unit J/kg (or cal/g). Specific latent heat. Not per degree.

This question belongs to: Science Physics

Question #2

The instrument to measure pressure difference is

A. Hydrometer

B. Barometer

C. Aneroid barometer

D. Manometer

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Correct Answer: Option D

Explanation:
Manometer measures pressure difference, often U-tube. Barometer measures atmospheric pressure.

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Question #3

The heat required to convert 1 g of water at 100°C to steam at 100°C is (latent heat 540 cal/g)

A. 100 cal

B. 1000 cal

C. 540 cal

D. 80 cal

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Correct Answer: Option C

Explanation:
Latent heat of vaporisation, 540 cal/g.

This question belongs to: Science Physics

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