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  4. For which of the following processes is the entropy change zero?

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Q. For which of the following processes is the entropy change zero?

VMMC MedicalVMMC Medical 2009

Solution:

The change in entropy ie, $ dS=\frac{\text{heat}\,\text{absorbeb}\,\text{by}\,\text{system}}{\text{absolute}\,\text{tempesrature}} $ or $ dS=\frac{dQ}{T} $ $ dQ=0 $ for adiabatic process. Therefore, entropy change is zero for adiabatic process.