Mercury is used in thermometers because it MCQ with Answer and Explanation

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Mercury is used in thermometers because it

A. Has low boiling point

B. Has uniform expansion and is opaque

C. Wets glass

D. Is transparent

Answer: Option B

Solution (By JKSSB Mock Tests)

Mercury has uniform thermal expansion, visible, high boiling point (357°C). Does not wet glass.

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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. Depends on charge

B. Same

C. Electron

D. Proton

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Correct Answer: Option D

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

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Question #2

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The velocity of light in vacuum is 3×10⁸ m/s. In a medium of refractive index 1.5, speed is

A. 2×10⁸ m/s

B. 4.5×10⁸ m/s

C. 3×10⁸ m/s

D. 1.5×10⁸ m/s

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Correct Answer: Option A

Explanation:
v = c/n = 3×10⁸/1.5 = 2×10⁸ m/s.

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Question #3

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Carnot efficiency depends on:

A. Working substance

B. Engine size

C. Both (a) and (b)

D. Source and sink temperatures only

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Correct Answer: Option D

Explanation:
η = 1 - T₂/T₁: depends only on absolute temperatures, independent of working fluid or design. Universal maximum efficiency limit. Memory tip: 'Carnot: only T_hot and T_cold matter; real engines less efficient'. Thermodynamics concept frequently tested in competitive exams.

This question belongs to: Science Physics

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