The instrument that measures the density of a liquid is MCQ with Answer and Explanation

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The instrument that measures the density of a liquid is

A. Hydrometer

B. Lactometer

C. Hygrometer

D. Barometer

Answer: Option A

Solution (By JKSSB Mock Tests)

Hydrometer measures relative density. Lactometer for milk, but general is hydrometer.

This question belongs to: Science Physics

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Question #1

The working of a rocket is based on

A. Newton's first law

B. Conservation of energy

C. Conservation of linear momentum

D. Law of gravitation

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Correct Answer: Option C

Explanation:
Rocket propulsion: momentum of exhaust gases equals momentum gained by rocket.

This question belongs to: Science Physics

Question #2

The principle of working of a hydrogen bomb is

A. Nuclear fusion

B. Chain reaction

C. Nuclear fission

D. Chemical explosion

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Correct Answer: Option A

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

This question belongs to: Science Physics

Question #3

The unit of power, watt, is equivalent to

A. J/s

B. N m

C. N/s

D. J s

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Correct Answer: Option A

Explanation:
Watt = joule per second.

This question belongs to: Science Physics

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