The device used for detecting feeble electric current is MCQ with Answer and Explanation

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The device used for detecting feeble electric current is

A. Voltmeter

B. Galvanometer

C. Ammeter

D. Wattmeter

Answer: Option B

Solution (By JKSSB Mock Tests)

Galvanometer detects small currents and direction. Ammeter measures larger currents.

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Question #1

A body executing SHM has amplitude 5 cm and time period 2 s. Maximum velocity is

A. 2.5π cm/s

B. 20π cm/s

C. 10π cm/s

D. 5π cm/s

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Correct Answer: Option D

Explanation:
v_max = ωA = (2π/T) A = (2π/2)×5 = 5π cm/s.

This question belongs to: Science Physics

Question #2

The resistance of a wire is R. If its length is doubled and area is halved, the new resistance is

A. R

B. R/2

C. 4R

D. 2R

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Correct Answer: Option C

Explanation:
R ∝ L/A. New L'=2L, A'=A/2 => R' = ρ(2L)/(A/2) = 4ρL/A = 4R. Alternatively, volume constant? Not given, here both changed independently. So 4R.

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Question #3

A hydraulic lift has area ratio of output to input piston 10:1. Force applied 50 N on input piston lifts weight of

A. 50 N

B. 5000 N

C. 500 N

D. 5 N

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Correct Answer: Option C

Explanation:
F1/A1 = F2/A2 => F2 = (A2/A1) F1 = 10×50 = 500 N.

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