Magnetic field lines inside a bar magnet go from MCQ with Answer and Explanation

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Magnetic field lines inside a bar magnet go from

A. Random

B. North to South

C. South to North

D. Depends on material

Answer: Option C

Solution (By JKSSB Mock Tests)

Outside N to S, inside S to N, forming closed loops.

This question belongs to: Science Physics

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Question #1

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A step-down transformer has turns ratio 10:1. Input voltage 220 V, output voltage is

A. 2200 V

B. 110 V

C. 22 V

D. 440 V

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Correct Answer: Option C

Explanation:
Vs/Vp = Ns/Np = 1/10 => Vs = 220/10 = 22 V.

This question belongs to: Science Physics

Question #2

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The substance used as moderator in nuclear reactor must

A. Increase neutron energy

B. Slow down neutrons without absorbing them

C. Absorb neutrons

D. Cool the reactor

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Correct Answer: Option B

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

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Question #3

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The radius of curvature of a convex mirror of focal length 20 cm is

A. 20 cm

B. 40 cm

C. 10 cm

D. 30 cm

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Correct Answer: Option B

Explanation:
R = 2f = 40 cm. For convex, f positive, R positive.

This question belongs to: Science Physics

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