Thermodynamics

Correct Answer is 1

@urvashi
When an ideal gas is compressed adiabatically and reversibly, the final temperature is higher than initial temperature.This can be proved by using 1st law of thermodynamics:
dq = dU + dW
In a adiabatic process,
dq =0
So,
dU = dW
As work is done on the gas , then dW is negative
That means dU is positive
As
dU = Cv × dT
As dU is positive
, then temperature must be increased .So, When an ideal gas is compressed adiabatically and reversibly, the final temperature is higher than initial temperature.

@urvashi
Simpler way