Q.

According to second law of thermodynamics a) All heat can be converted into workb) The efficiency of a heat engine is always lesser than unityc) It is not possible to transfer heat from lower to higher temperature by it self

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a

Both a and b are true

b

Both b and c are true

c

Both a and c are true

d

a, b, c are true

answer is B.

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Detailed Solution

dQ=dU+dWη=1-T2T1 η<1 some energy is converted in the form of heat, sound, light etc Heat always transfer from body at higher temperature to body at lower temperature
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According to second law of thermodynamics a) All heat can be converted into workb) The efficiency of a heat engine is always lesser than unityc) It is not possible to transfer heat from lower to higher temperature by it self