And similarly, $T \times V^{\gamma-1}=l$ where $l$ is a constant.
Therefore, the decrease in volume is associated with increase in temperature as well as increase in pressure.

Assertion $A$ : If $dQ$ and $dW$ represent the heat supplied to the system and the work done on the system respectively. Then according to the first law of thermodynamics $d Q=d U-d W$.
Reason $R :$ First law of thermodynamics is based on law of conservation of energy.
In the light of the above statements, choose the correct answer from the option given below :

