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