Which of the following process is iso-entropic?
Isobaric process
Adiabatic process
Isothermal process
Isochoric process
As we have learned,
According to the definition of entropy,
Change in entropy,
As the heat change in the adiabatic process is equal to zero. Hence the change in entropy will be zero, which means the entropy will change in the process.
So the adiabatic reversible process will iso-entropic process as well.
Hence, option number (2) is correct