Question

Four curves $A$, $B$, $C$ and $D$ are drawn in figure for a given amount of gas. The curves which represent adiabatic and isothermal changes are.

• A. $C$ and $D$, respectively
• B. $D$ and $C$, respectively
• C. $A$ and $B$, respectively
• D. $B$ and $A$, respectively

Answer 1

Answer: (C)

$A$ and $B$, respectively

The PV graph is always a rectangular hyperbola with its asymptotes as the positive x and y axes.
However, $theslopeoftheadiabaticcurveis\gamma timestheslopeforanisothermalcurve.$

Thus, A curve is for adiabatic and B for isothermal.