Question

A thermodynamical system is changed from state $(P_1, V_1)$ to $(P_2, V_2)$ by two different processes, the quantity which will remain same will be

• A. $\Delta Q$
• B. $\Delta W$
• C. $\Delta Q + \Delta W$
• D. $\Delta Q - \Delta W$

Answer 1

Answer: (D)

$\Delta Q - \Delta W$

Answer 2

For all processes, change in internal energy $\Delta U=(\Delta Q-\Delta W)$ does not change.
It depends only on initial and final states.