The device used to measure the emf of a cell without drawing current is MCQ with Answer and Explanation

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The device used to measure the emf of a cell without drawing current is

A. Ammeter

B. Galvanometer

C. Voltmeter

D. Potentiometer

Answer: Option D

Solution (By JKSSB Mock Tests)

Potentiometer: null deflection method, no current drawn from cell.

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Question #1

The SI unit of frequency is

A. Second

B. Metre

C. Watt

D. Hertz

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Correct Answer: Option D

Explanation:
Hertz (Hz) = cycle per second = s⁻¹. Named after Heinrich Hertz. For sound, radio waves. Kilohertz, megahertz, gigahertz.

This question belongs to: Science Physics

Question #2

Which of the following is NOT a unit of pressure?

A. Watt

B. Pascal

C. Bar

D. Torr

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Correct Answer: Option A

Explanation:
Watt is power. Others are pressure units.

This question belongs to: Science Physics

Question #3

An electron enters a magnetic field parallel to the field lines. Force is

A. Depends on speed

B. Maximum

C. Zero

D. Half of maximum

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Correct Answer: Option C

Explanation:
F = qvB sinθ, θ=0 => sin0=0, zero force.

This question belongs to: Science Physics

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