Student Login

Home›Chapters›Thermodynamics PYQs›Heat, Work & First Law of Thermodynamics›Question 4

MHT CET 2026 (19 Apr, Shift 2) · Heat, Work & First Law of Thermodynamics

Heat, Work & First Law of Thermodynamics question from MHT CET 2026 (19 Apr, Shift 2)

Q4MHT CET 2026 · 19 APR · SHIFT 2Medium

Heat, Work & First Law of Thermodynamics

An ideal gas having pressure P, volume V and temperature T undergoes a thermodynamic process in which $dW = 0$ and $dQ < 0$ . Then, for the gas

Show answer and solution

Answer: (c)

$dW = 0 \Rightarrow$ volume constant (isochoric).
First law: $dU = dQ - dW = dQ < 0$ , so internal energy falls.
For an ideal gas $U \propto T$ , so $T$ decreases (and $P \propto T$ decreases, not 'may increase').
So the answer is (c) T will decrease.

Report a mistake

More questions on Heat, Work & First Law of Thermodynamics

One gram of a liquid is converted to vapour at 3 × 10⁵ Pa pressure. If 10% of the heat…MHT CET 2026 (16 Apr, Shift 2)
Given are statements for certain thermodynamic variables, (A) Internal energy, volume (V)…JEE Main 2025 (22 Jan, Shift 2)
During the melting of a slab of ice at 273 K at atmospheric pressure:JEE Main 2025 (3 Apr, Shift 1)
If heat energy Δ Q is supplied to an ideal diatomic gas, the increase in internal energy…MHT CET 2024 (16 May, Shift 1)
A source supplies heat to a system at the rate of 1000 W. If the system performs work at…JEE Main 2023 (6 Apr, Shift 1)
Given below are two statements: One is labelled as Assertion A and the other is labelled…JEE Main 2023 (29 Jan, Shift 1)
1 kg of water at 100 is converted into steam at 100 by boiling at atmospheric pressure…JEE Main 2023 (11 Apr, Shift 1)
Given below are two statements: Statement I: If heat is added to a system, its…JEE Main 2023 (8 Apr, Shift 1)