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Second Law, Entropy and Heat Engines for JEE: 6 solved questions

Real JEE paper questions on second law, entropy and heat engines, part of thermodynamics. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2003 to 2025. No sign-in needed to read them.

What this topic asks

• Second Law and Reversibility — 3 questions
• Entropy and the Carnot Engine — 3 questions

All 6 questions with solutions

• A balloon filled with helium at 32°C and 1.7 atm bursts. Immediately afterwards the expansion of the helium c… JEE Main 3rd Sept 1st Shift 2020
• Water of mass m gram is slowly heated so that its temperature rises from T₁ to T₂. The change in entropy of t… JEE Main 23rd Jan 2nd Shift 2025
• Given below are two statements, one labelled Assertion (A) and the other labelled Reason (R). Assertion (A):… JEE Main 24th Jan 2nd Shift 2025
• A Carnot engine E is working between two temperatures 473 K and 273 K. In a new system, two engines are used:… JEE Main 28th Jan 1st Shift 2025
• A solid body of constant heat capacity 1 J/° C is heated by keeping it in contact with reservoirs in two ways… JEE Main 2015
• "Heat cannot by itself flow from a body at lower temperature to a body at higher temperature" is a statement… JEE Main 2003