Question

N an adiabatic process, what happens when gases in a system are compressed?

Answer 1

Answer:

The temperature of the system increases.

Explanation:

As we know that in adiabatic process the heat transferred to the system must be zero

now by first law of thermodynamics we know that

$Q = \Delta U - W$

now we know that

Q = 0 (for adiabatic process)

now we have

$\Delta U = W$

as we know that gas is compressed so the work is done on the gas which shows W is positive

So here change in internal energy must be positive which shows that temperature must be increased

so correct answer will be

The temperature of the system increases.

Answer 2

When a gas is compressed rapidly, temperature increases because temperature and volume of gas are inversely proportional to each other according to gas laws. When a gas is compressed rapidly, its volume decreases leading to increase in temperature.
Also the pressure increase which also increases the randomness of the gas molecules which start to collide more frequently and thus the temperature rises .
just to make you understand what randomness affects - you would have noticed that you often sweat in a small room filled with people but it’s cooler if the same number of people are there in a bigger room.
hope it helps you