JEE Main 2026 · 5 Apr · Shift 1 · Physics Q33

PhysicsSingle correct+4 / -1Question 33 of 75

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:

C, D and E Only

A, B and C Only

A, B and D Only

B, C and D Only

Answer and worked solution

Official answer: C

Each statement.

A: The zeroth law defines temperature. True.
B: The first law introduces internal energy as a state function. True.
C: In isothermal expansion of an ideal gas, $\Delta U=0$ , so $\Delta Q=\Delta W$ . False.
D: Intensive × extensive is extensive (e.g. $P\times V$ ). True.
E: Extensive ÷ mass is intensive (e.g. specific volume). False.

Correct: A, B and D.

(C)

Topics:First law and internal energy Zeroth law

JEE Main 2026 · 5 Apr · Shift 1, Physics question 33