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 :
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 :
- (A)A and E only
- (B)B and D only
- (C)C and E only
- (D)C and D only✓ Correct
Answer: (D)
Solution
In an isothermal change the temperature is fixed, and for an ideal gas the internal energy depends only on temperature, so and the internal energy does not change. The first law then reduces to , and since heat is supplied the work done by the gas is positive. The internal energy stays constant and the gas does positive work.
JEE Main · 2023 · 30 Jan 2023 · Shift 1 · Single correct option