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.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1

The temperature of boiling water in Fahrenheit scale is

A. 212°F

B. 180°F

C. 100°F

D. 32°F

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Correct Answer: Option A

Explanation:
Boiling point 100°C = (9/5×100)+32 = 180+32 = 212°F. Freezing 0°C = 32°F. Body temp 98.4°F ≈ 37°C. Scale conversion.

This question belongs to: Science Physics

Question #2

The frequency of a seconds pendulum is

A. 0.5 Hz

B. 0.25 Hz

C. 1 Hz

D. 2 Hz

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Correct Answer: Option A

Explanation:
Seconds pendulum has time period of 2 seconds (1 s for half swing). Frequency f = 1/T = 1/2 = 0.5 Hz. Length about 99.4 cm on Earth. Not exactly 1 m.

This question belongs to: Science Physics

Question #3

Weight of 10 kg mass on Moon (g_moon ≈ g_earth/6) is:

A. 10 N

B. 100 N

C. 60 N

D. 16.7 N

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Correct Answer: Option D

Explanation:
Weight W = mg. On Earth: 10×10 = 100 N. On Moon: g_moon ≈ 10/6 ≈ 1.67 m/s². W_moon = 10×1.67 ≈ 16.7 N. Mass remains 10 kg; weight changes with gravity. Memory tip: 'Mass constant; weight ∝ g'. Tests mass-weight distinction and gravity variation, common conceptual question in competitive exams.

This question belongs to: Science Physics

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