“Heat cannot by itself flow from a body at lower temperature to a body at higher temperature” is a statement or consequence of
first law of thermodynamics
second law of thermodynamics
conservation of momentum
conservation of mass
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Helium gas goes through a cycle ABCDA (consisting of two isochoric and isobaric lines) as shown in figure. Efficiency of this cycle is nearly(Assume the gas to be close to ideal gas)
