The instrument used to measure pressure difference is MCQ with Answer and Explanation

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The instrument used to measure pressure difference is

A. Hydrometer

B. Lactometer

C. Barometer

D. Manometer

Answer: Option D

Solution (By JKSSB Mock Tests)

Manometer measures pressure difference. Barometer atmospheric pressure.

This question belongs to: Science Physics

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Question #1

In a nuclear reactor, the function of a moderator is to

A. Slow down neutrons

B. Control chain reaction

C. Remove heat

D. Absorb neutrons

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Correct Answer: Option A

Explanation:
Moderator slows fast neutrons to thermal energies to increase probability of fission. Common moderators: heavy water, graphite. Control rods (cadmium, boron) absorb neutrons. Coolant removes heat.

This question belongs to: Science Physics

Question #2

A 5 kg object is moving with 2 m/s. Its momentum is

A. 2.5 kg m/s

B. 0.4 kg m/s

C. 10 kg m/s

D. 7 kg m/s

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Correct Answer: Option C

Explanation:
p = m v = 5 × 2 = 10 kg m/s. Direction same as velocity. Momentum vector. Unit kg·m/s.

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. Zero

C. Half of maximum

D. Maximum

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Correct Answer: Option B

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

This question belongs to: Science Physics

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