A wire of resistance 16 Ω is drawn to double its length. New resistance is MCQ with Answer and Explanation

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A wire of resistance 16 Ω is drawn to double its length. New resistance is

A. 8 Ω

B. 4 Ω

C. 64 Ω

D. 32 Ω

Answer: Option C

Solution (By JKExamLibrary)

Volume constant: R' = n² R = 2² × 16 = 64 Ω.

This question belongs to: Science Physics

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Heat required to convert 1 g of ice at 0°C to water at 0°C is (latent heat 80 cal/g)

A. 1 cal

B. 80 cal

C. 100 cal

D. 540 cal

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Correct Answer: Option B

Explanation:
Latent heat of fusion of ice = 80 cal/g. So 1 g needs 80 cal. No temperature change.

This question belongs to: Science Physics

Question #2 Report Error

The substance used as moderator in nuclear reactor must

A. Cool the reactor

B. Increase neutron energy

C. Slow down neutrons without absorbing them

D. Absorb neutrons

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Correct Answer: Option C

Explanation:
Moderator slows neutrons via elastic collisions, low absorption. Heavy water, graphite.

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Question #3 Report Error

The velocity of a body changes from 2 m/s to 10 m/s in 4 s. Distance covered in this time is (assuming constant acceleration)

A. 48 m

B. 32 m

C. 16 m

D. 24 m

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Correct Answer: Option D

Explanation:
a = (10-2)/4 = 2 m/s². s = 2×4 + ½×2×16 = 8+16=24 m. Or average velocity 6 m/s ×4=24.

This question belongs to: Science Physics

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