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(D) The change in entropy $(dS)$ for a reversible process is defined as $dS = \frac{dQ_{rev}}{T}$.For an adiabatic reversible process,the heat exchang

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Conversion of work into heat isochorically

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(D) The change in entropy $(dS)$ for a reversible process is defined as $dS = \frac{dQ_{rev}}{T}$.For an adiabatic reversible process,the heat exchange $dQ_{rev} = 0$,which implies $dS = 0$.Among the given options,the conversion of work into heat isochorically (if done reversibly) or any process that is internally reversible and adiabatic results in no change in entropy.However,in the context of standard thermodynamic problems,a reversible process is defined as an isentropic process $(dS = 0)$.Option $(d)$ represents a process where work is converted to heat; if this is performed reversibly,the entropy of the system remains constant.

The entropy of a thermodynamic system does not change when this system is used for:

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