Choose the incorrect statement from the following

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The efficiency of a heat engine can be 1, but the coefficient of performance of a refrigerator can never be infinity

The first law of thermodynamics is basically the principle of conservation of energy

The second law of thermodynamics does not allow several phenomena consistent with the first law

A process, whose sole result is the transfer of heat from a colder object to a hotter object is impossible when it is not aided by an external source.

answer is A.

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Detailed Solution

Efficiency of Carnot engine η=1-T2T1To have the efficiency equal to 1 either the source temperatureT1has to be at infinity or sink temperatureT2 has to be at absolute zero.which is impossible to attain in practice so engine efficiency cannot be equal to 1

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