Question

Figure shows four $P-V$ diagrams. Which of these curves represent isothermal and adiabatic process?

• A. $D\text{and}C$
• B. $A\text{and}C$
• C. $A\text{and}B$
• D. $B\text{and}D$

Answer 1

The correct option is A $D\text{and}C$

Slope of both isothermal and adiabatic process curve is negative where as that for curves $A$ and $B$ is positive. Therefore, $A$ and $B$ cannot be the required curves. Out of $C$ and $D$ , slope of $D$ is smaller. Therefore, $D$ is isothermal curve and $C$ is adiabatic curve.