Question

Which of the following processes is an iso-entropic process?

• A. Isothermal process
• B. Adiabatic process
• C. Isobaric process
• D. Isochoric process

Answer 1

The correct option is B Adiabatic process

What do you mean by iso-entropic process?
$\Rightarrow$The name itself is giving you the answer.
The entropy should be same before and after the process occurs.
Here we know that,
$\Delta S=\frac{dq}{T}$
In case of adiabatic process,
dq = 0
Therefore $\Delta S$ = 0