NEET UG PHYSICS MCQ: THERMODYNAMICS

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A Carnot’s engine works as a refrigerator between 250 K and 300 K. It receives 500 cal heat from the reservoir at the lower temperature. The amount of work done in each cycle to operate the refrigerator is

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Correct option: A

420 J

Option A (420 J) is correct because it is the work done calculated from the Carnot refrigerator's coefficient of performance.

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The work done during expansion of a gas is independent of pressure if the expansion takes place When heat is added to a system, which of the following is not possible? The

p-T

relation for an adiabatic expansion is
A Carnot engine has efficiency

\frac{1}{4}

. Efficiency becomes

\frac{1}{3}

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

4^{\circ} \mathrm{C}

and

15^{\circ} \mathrm{C}

respectively. Then efficiency of refrigerator is The

SI

unit of mechanical equivalent of heat is