Question

An ideal gas undergoes four different processes from the same initial state (Figure Four processes are adiabatic, isothermal, isobaric and isochoric. Out of $1,2,3$ and $4$, which one is adiabatic?

• A. $4$
• B. $3$
• C. $2$
• D. $1$

Answer 1

Answer: (C)

$2$

When a thermodynamic system undergoes a change in such a way that no exchange of heat takes place between it and the surroundings, the process is known as adiabatic process.

Graph $4$ is isobaric process, $1$ is isochoric. Of $3$ and $2,3$ has the smaller slope (magnitude) hence is isothermal. Remaining process is adiabatic. So graph $2$ is adiabatic. Correct answer is option (C).