Question

The incorrect figure(s) representing isothermal and adiabatic expansion of an ideal gas from a particular initial state is(are):

• A. A
• B. B
• C. C
• D. D

Answer 1

Answer: (B), (C), (D)

The correct options are
B B
C C
D D

We know that, for an isothermal process, PV = constant

For an adiabatic process,
$P{V}^{\gamma }$ = constant

As $\gamma >1$, P will vary more in an adiabatic process than in an isothermal process on making the same change in volume. Thus, making the curve steeper in case of an adiabatic process.


(a) is correct and all (b), (c), (d) are wrong.