Consider the following statements:
A. Zeroth law of thermodynamics gives concept of temperature
B. First law of thermodynamics gives concept of internal energy
C. In isothermal expansion of ideal gas,
D. Product of intensive and extensive variables is extensive
E. The ratio of any extensive variable to mass will be an extensive variable
Choose the correct combination of statements from the options given below:
A. Zeroth law of thermodynamics gives concept of temperature
B. First law of thermodynamics gives concept of internal energy
C. In isothermal expansion of ideal gas,
D. Product of intensive and extensive variables is extensive
E. The ratio of any extensive variable to mass will be an extensive variable
Choose the correct combination of statements from the options given below:
- (A)C, D and E Only
- (B)A, B and C Only
- (C)A, B and D Only✓ Correct
- (D)B, C and D Only
Answer: (C)
Solution
The zeroth law establishes thermal equilibrium and so defines temperature, making statement A true. The first law, , introduces internal energy, so statement B is true. In an isothermal change of an ideal gas the temperature, and hence the internal energy, is constant (), so ; statement C, which claims they are unequal, is false. The product of an intensive variable and an extensive variable, such as pressure times volume, is extensive, so statement D is true. The ratio of an extensive variable to mass is a specific (per-unit-mass) quantity, which is intensive, so statement E is false. The correct statements are A, B and D.
JEE Main · 2026 · 05 Apr 2026 · Shift 1 · Single correct option