Question 36 of 190
Heat is given to an ideal gas in an isothermal process.
A. Internal energy of the gas will decrease.
B. Internal energy of the gas will increase.
C. Internal energy of the gas will not change.
D. The gas will do positive work.
E. The gas will do negative work.
Choose the correct answer from the options given below :
Show answer and solution
Answer: (D) C and D only
From the first law of thermodynamics, heat supplied to the system , change in internal energy of the system and work done by the system are related as:
Since the process is isothermal, the temperature of the system is constant and therefore (i.e., internal energy is constant).
As heat is supplied to the system, is positive and therefore is positive i.e., gas will do positive work.
Hence, correct options are C and D.
Since the process is isothermal, the temperature of the system is constant and therefore (i.e., internal energy is constant).
As heat is supplied to the system, is positive and therefore is positive i.e., gas will do positive work.
Hence, correct options are C and D.