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First Law and Molar Specific Heats for JEE: 12 solved questions

Real JEE paper questions on first law and molar specific heats, part of thermodynamics. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2005 to 2025. No sign-in needed to read them.

What this topic asks

• First Law and Sign Convention — 8 questions
• Molar Specific Heats and Degrees of Freedom — 4 questions

All 12 questions with solutions

• In an adiabatic process, which of the following statements is true? JEE Main 2nd April 1st Shift 2025
• A source supplies heat to a system at the rate of 1000 W. If the system performs work at a rate of 200 W, the… JEE Main 6th April 1st Shift 2023
• Given below are two statements. Statement I: If heat is added to a system, its temperature must increase. Sta… JEE Main 8th April 1st Shift 2023
• Given below are two statements, one labelled Assertion (A) and the other labelled Reason (R). Assertion (A):… JEE Main 29th Jan 1st Shift 2023
• The figure shows two processes A and B for a gas. If Δ Q_A and Δ Q_B are the amounts of heat absorbed by the… JEE Main 9th April 1st Shift 2019
• A gas can be taken from A to B via two different processes, ACB and ADB. When the path ACB is used, 60 J of h… JEE Main 9th Jan 1st Shift 2019
• In a process, the temperature and volume of one mole of an ideal monoatomic gas are varied according to the r… JEE Main 11th Jan 2nd Shift 2019
• An ideal gas undergoes a quasi-static reversible process in which its molar heat capacity C remains constant.… JEE Main 2016
• When a system is taken from state i to state f along the path iaf, it is found that Q=50 cal and W=20 cal. Al… JEE Main 2007
• A system goes from A to B via two processes I and II as shown in the figure. If Δ U₁ and Δ U₂ are the changes… JEE Main 2005
• Which of the following is incorrect regarding the first law of thermodynamics? JEE Main 2005
• The internal energy of the air in a room of size 4 m×4 m×3 m at 1 atmosphere of pressure will be ×10⁶ J. (Con… JEE Main 2nd April 2nd Shift 2025