When an ideal gas is compressed adiabatically, its temperature rises: the molecules on an average have more kinetic energy than before. The kinetic energy increases:

1. because of collisions with moving parts of the wall only.
2. because of collisions with the entire wall.
3. because the molecules get accelerated in their motion inside the volume.
4. because of the redistribution of energy amongst the molecules.




 

(1) Hint: The kinetic energy of a gas depends on the collisions between the molecules.
When the gas is compressed adiabatically, the total work done on the gas increases its internal energy which in turn increases the kinetic energy of gas molecules and hence, the collisions between molecules also increase.