Question

Pressure versus temperature graph of an ideal gas is shown is figure
Which of the following is correct?

• A. During the process AB work done by the gas is positive
• B. During the process CD work done by the gas is negative
• C. During the process BC internal energy of the gas is increasing
• D. None

Answer 1

Answer: (C)

During the process BC internal energy of the gas is increasing

Internal energy of an ideal gas is a function of temperature alone, and doesn't depend on any other parameters like volume, or pressure.
In process BC, the temperature increases linearly; hence the internal energy of the gas also increases.