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NEET UG PHYSICS MCQ: THERMODYNAMICS
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An engine operating between the boiling and freezing points of water will have
A. Efficiency more than
B. Efficiency less than the efficiency of a Carnot engine operating between the same two temperatures.
C. Efficiency equal to
D. Efficiency less than
Choose the correct answer from the options given below
A. Efficiency more than
B. Efficiency less than the efficiency of a Carnot engine operating between the same two temperatures.
C. Efficiency equal to
D. Efficiency less than
Choose the correct answer from the options given below
View answer and explanation
Correct option: C
B and D only
Option C (B and D only) is correct because any real engine operating between two temperatures will have efficiency less than the Carnot engine, and the Carnot efficiency between 0°C and 100°C is less than 27%.
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A Carnot engine has efficiency . Efficiency becomes when temperature of sink is decreased by 50 K (keeping source fixed). What is the original temperature of the sink? If sink and source temperature of a refrigerator are and respectively. Then efficiency of refrigerator is The unit of mechanical equivalent of heat is