Question

The initial state of certain gas is (PiViTi). It undergoes expansion till its volume becomes Vf at constant temperature T. The correct plot of P-V diagram for it is

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Answer 2

: As $P V = n R T$

At constant temperature

$P _ { i } V _ { i } = n R T$ and $P _ { f } V _ { f } = n R T$ $\Rightarrow P _ { i } V _ { i } = P _ { f } V _ { f }$

In the given P-V diagram (1) at every point on the plot P-V is constant which shows a process at constant temperature i.e. isothermal process.