A voltmeter is always connected in MCQ with Answer and Explanation

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A voltmeter is always connected in

A. Parallel

B. Either series or parallel

C. Across the ammeter

D. Series

Answer: Option A

Solution (By JKSSB Mock Tests)

Voltmeter measures potential difference, must be parallel.

This question belongs to: Science Physics

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Question #1

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

A. Zero

B. Half of maximum

C. Maximum

D. Depends on speed

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Correct Answer: Option A

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

This question belongs to: Science Physics

Question #2

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The direction of magnetic field around a straight current-carrying wire is given by

A. Fleming's left hand rule

B. Fleming's right hand rule

C. Ohm's law

D. Right hand thumb rule

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Correct Answer: Option D

Explanation:
Right hand thumb rule: thumb current, fingers curl gives field direction.

This question belongs to: Science Physics

Question #3

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The device that converts light energy into electrical energy is

A. Laser

B. Solar cell

C. LED

D. Photodiode

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Correct Answer: Option B

Explanation:
Solar cell (photovoltaic cell) generates electricity from light.

This question belongs to: Science Physics

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