A hydrometer is used to measure MCQ with Answer and Explanation

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A hydrometer is used to measure

A. Wind speed

B. Humidity

C. Density of liquids

D. Atmospheric pressure

Answer: Option C

Solution (By JKSSB Mock Tests)

Hydrometer measures relative density (specific gravity) of liquids based on floatation principle. Deeper sinking indicates less dense liquid. Hygrometer measures humidity, anemometer wind speed, barometer pressure.

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Which of the following is a non-ohmic conductor?

A. Silver wire

B. Iron wire

C. Copper wire

D. Diode

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Correct Answer: Option D

Explanation:
Diode has non-linear I-V characteristic. Metals are ohmic.

This question belongs to: Science Physics

Question #2

The principle of working of a hydrogen bomb is

A. Chemical explosion

B. Chain reaction

C. Nuclear fission

D. Nuclear fusion

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Correct Answer: Option D

Explanation:
Hydrogen bomb uses uncontrolled fusion of deuterium and tritium triggered by fission bomb. Releases vast energy, thermonuclear reaction. Sun's energy is fusion.

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Question #3

Pendulum on planet with g' = 4g. Period becomes:

A. Half

B. Double

C. Same

D. Four times

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Correct Answer: Option A

Explanation:
T ∝ 1/√g. If g' = 4g, T' = T/√4 = T/2. Higher gravity ⇒ faster oscillations. Memory aid: 'Pendulum: T ∝ 1/√g; 4× gravity ⇒ half period'. Oscillations proportionality frequently tested in competitive exams.

This question belongs to: Science Physics

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