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As area under P-V diagram represent work...

As area under P-V diagram represent work done by gas in a thermodynamic process, area under temperature (T) entropy (S) graph represents heat supplied to the thermodynamic system. Consider the following graph

A

Process AB is isochoric

B

Process BC is isothermal

C

Process AB is adiabatic

D

heat is absorbed by the gas during the process ACBA

Text Solution

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The correct Answer is:
B, C, D
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Entropy ( S ) is a thermodynamic variable like pressure P , volume V and temperature T . Entropy of a thermodynamic system is a measure of disorder of molecular motion. Greater is disorder , greater is entropy. Change in entropy of a thermodynamic system is the ratio of heat supplied to absolute temperature.In an adiabatic reversible process, entropy remains constant while in any irreversible process entropy increases. In nature the processes are irreversible , therefore entropy of universe is continuoulsy increasing. The unit of entropy in S-I system is -