Question

Ideal gas is taken through the process shown in figure

• A. in process $AB$, work done by system is positive
• B. In process $AB$, heat is rejected out of the system
• C. In process $AB$, internal energy increases
• D. In process $AB$ internal energy decreases and in process $BC$ internal energy increases.

Answer 1

The correct option is B In process $AB$, heat is rejected out of the system

Process A to B is isochoric process has work done zero and by first law of thermodynamics.

$Heat=\Delta U+work$

if work is zero $Heat=\Delta U=mC\Delta T$

Since the process is moving form A to B the heat is rejected out of system.