Question

$\Delta U$ will be zero for which processes?

• A. Cyclic process
• B. Isothermal expansion
• C. Isochoric process
• D. Adiabatic process

Answer 1

Answer: (A), (B), (C)

The correct options are
A Cyclic process
B Isothermal expansion
C Isochoric process

Since, the $\Delta U$ is a function of temperature and volume,

In isothermal process, Temperature is constant so $\Delta U=0$

and in isochoric process, volume is constant so $\Delta U=0$

and in cyclic process, after one complete cycle the system returns to its original state, so $\Delta U=0$