Question

In adiabatic process, the work done by system is $50J$, then :

• A. The temperature of the system will increase by $50J$
  
• B. The temperature of the system will remain constant
• C. The internal energy of the system will increase by $50J$
• D. The internal energy of the system will decrease by $50J$

Answer 1

The correct option is D The internal energy of the system will decrease by $50J$

From first law of thermodynamics
$dQ=dU+dW$
For adiabatic process $dQ=0$
$\therefore dU+dW=0$
$dU=-50J$
Therefore, the internal energy of system will decrease.