JEE Main 2026 — Apr 5, Shift 1 — Physics solution

JEE Main2026Apr 5, Shift 1Physics

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, $Δ Q \neq = Δ W$

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:

Solution

A is the textbook statement of the zeroth law (transitive thermal equilibrium defines temperature). True.

B: the first law introduces $U$ as a state function via $Δ U = Q - W$ . True.

C: For an ideal gas at constant temperature, $Δ U = 0$ , so $Δ Q = Δ W$ . The statement that they are unequal is false.

D: An intensive quantity multiplied by an extensive one (e.g. $P \cdot V$ ) scales with system size, hence extensive. True.

E: Ratio of an extensive quantity to mass gives a specific (intensive) quantity, not extensive. False.

Correct combination: A, B, and D.

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