A fuse wire is connected in which wire of the circuit? MCQ with Answer and Explanation

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A fuse wire is connected in which wire of the circuit?

A. Phase (live)

B. Neutral

C. Any wire

D. Earth

Answer: Option A

Solution (By JKSSB Mock Tests)

Fuse must be in live wire so that appliance is isolated when fuse blows.

This question belongs to: Science Physics

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Question #1

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Assertion (A): The velocity of sound is greater in solids than in gases. Reason (R): Solids possess higher elasticity compared to gases.

A. Both A and R are true but R is NOT the correct explanation of A.

B. Both A and R are true and R is the correct explanation of A.

C. A is true but R is false.

D. A is false but R is true.

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Correct Answer: Option B

Explanation:
The velocity of sound in a medium is determined by the formula v = √(E/ρ), where E is the modulus of elasticity and ρ is the density. Although solids are denser, their modulus of elasticity (bulk modulus) is tremendously higher than that of gases, overwhelmingly compensating for the density. Hence, sound travels fastest in solids.

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Question #2

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The instrument that measures atmospheric pressure is

A. Lactometer

B. Manometer

C. Barometer

D. Hydrometer

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Correct Answer: Option C

Explanation:
Barometer measures atmospheric pressure. Mercury barometer (Torricelli) standard. Aneroid barometer. Manometer measures pressure difference. Hydrometer density. Lactometer milk purity.

This question belongs to: Science Physics