The SI unit of pressure is MCQ with Answer and Explanation

The SI unit of pressure is

A. Torr

B. Atmosphere

C. Pascal

D. Bar

Answer: Option C

Solution (By JKExamLibrary)

Pascal (Pa) = N/m². Bar = 10⁵ Pa, Torr = mm Hg, atmosphere is another unit. SI unit is pascal. Named after Blaise Pascal.

This question belongs to: Science Physics

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Question #1 Report Error

The efficiency of an ideal Carnot engine operating between two temperatures T1 (source) and T2 (sink) is given by:

A. T2 / (T1 - T2)

B. 1 - (T1/T2)

C. 1 - (T2/T1)

D. (T1 - T2) / T2

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Correct Answer: Option C

Explanation:
The thermal efficiency (η) of a reversible Carnot engine depends exclusively on the absolute temperatures of the hot source (T1) and the cold sink (T2). The formula is η = 1 - (T2/T1), or (T1 - T2) / T1. Temperatures must be in Kelvin. It shows no engine can be 100% efficient unless the sink is at absolute zero.

This question belongs to: Science Physics

Question #2 Report Error

The gas used in refrigerators is

A. Oxygen

B. Carbon dioxide

C. Nitrogen

D. Freon

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Correct Answer: Option D

Explanation:
Freon (CFC) was used as refrigerant; now HFCs used. Freon is common answer in exams.

This question belongs to: Science Physics

Question #3 Report Error

Medium n=2. Light speed in medium:

A. 1.5×10⁸ m/s

B. 0.5×10⁸ m/s

C. 6×10⁸ m/s

D. 3×10⁸ m/s

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Correct Answer: Option A

Explanation:
v = c/n = 3×10⁸/2 = 1.5×10⁸ m/s. Direct refractive index application. Memory tip: 'Higher n ⇒ slower light; v = c/n'. Optics calculation frequently tested in competitive exams.

This question belongs to: Science Physics

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