Q 11-11-039JEE MainJEE Main 2026 (5 Apr, Shift 1)Medium
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, $\Delta Q \ne \Delta W$
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:
Answer: (C) A, B and D Only
Concept. Zeroth law → temperature; first law → internal energy. Extensive variables scale with the amount of matter; intensive ones do not.
Step 1. Check each.
- A: true.
- B: true.
- C: in an isothermal process of an ideal gas $\Delta U=0$, so $\Delta Q=\Delta W$. False.
- D: intensive $\times$ extensive is extensive (e.g. $P\times V$ doubles when the system doubles). True.
- E: extensive $\div$ mass is intensive (e.g. specific heat). False.
Answer. A, B and D only (Option C).
Solution by Sreeraj P, M.Sc Physics
