Question

Based on the first law oi thermodynamics, which one of the following is correct?

• A. For an isothermal process, $Q=+w$
• B. For an isochoric process, $\Delta U=-Q$
• C. For an adiaoatic process, $\Delta\,U =-W$
• D. For a cyclic process, $Q =-w$

Answer 1

Answer: (D)

According to first law of thermodynamics,

$\Delta U=Q+W$

For cyclic process, change in internal energy

$=0$

$\therefore Q=-W$