Assertion (A) When an ideal gas is compressed adiabatically, its temperature and the average kinetic energy…
Assertion (A) When an ideal gas is compressed adiabatically, its temperature and the average kinetic energy of the gas molecules increase.
Reason (R) The kinetic energy increases because of collisions of molecules with moving parts of wall only.
$\mathrm{A}$ and $\mathrm{R}$ and true and $\mathrm{R}$ is correct explanation of A.
$\mathrm{A}$ and $\mathrm{R}$ are true but $\mathrm{R}$ is not correct explanation of $A$.
$A$ is true and $R$ is false.
$\mathrm{A}$ is false and $\mathrm{R}$ is true.
Solution
When an ideal gas is compressed adiabatically, its temperature and the average kinetic energy of the gas molecule increases because of collision of molecules with wall. Hence, Both A and R are true and R is the correct explanation of A.