Instrument measuring humidity: MCQ with Answer and Explanation

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Instrument measuring humidity:

A. Hygrometer

B. Hydrometer

C. Barometer

D. Anemometer

Answer: Option A

Solution (By JKSSB Mock Tests)

Hygrometer measures atmospheric humidity (water vapor content). Barometer: pressure; Hydrometer: liquid density; Anemometer: wind speed. Memory tip: 'Hygro = moisture; meter = measure'. Instrument identification frequently tested in competitive exams to verify practical physics knowledge.

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Question #1

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A proton and an electron enter a uniform magnetic field with same velocity perpendicular to field. Which has larger radius?

A. Proton

B. Same

C. Depends on charge

D. Electron

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Correct Answer: Option A

Explanation:
r = mv/(qB). Proton mass >> electron mass, so radius larger.

This question belongs to: Science Physics

Question #2

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The half-life of a radioactive sample is 3 days. After 9 days, fraction remaining is

A. 1/2

B. 1/16

C. 1/4

D. 1/8

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Correct Answer: Option D

Explanation:
3 half-lives (9/3=3) => (1/2)³ = 1/8.

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Question #3

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Young's double slit: fringe width β = λD/d. If d doubled, β becomes:

A. Same

B. Half

C. Double

D. Four times

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Correct Answer: Option B

Explanation:
β ∝ 1/d. If d' = 2d, β' = β/2. Fringe width decreases with increased slit separation. Memory aid: 'β ∝ 1/d; wider slit separation ⇒ narrower fringes'. Wave optics proportionality frequently tested in competitive exams.

This question belongs to: Science Physics

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