Thermodynamics - JEE Main Previous Year Questions with Solutions
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JEE Main Previous Year Question of Physics with Solutions are available here. Practicing JEE Main Previous Year Papers Questions of Physics will help all the JEE aspirants in realizing the question pattern as well as help in analyzing their weak & strong areas. Get detailed Class 11th &12th Physics Notes to prepare for Boards as well as competitive exams like IIT JEE, NEET etc. eSaral helps the students in clearing and understanding each topic in a better way. eSaral is providing complete chapter-wise notes of Class 11th and 12th both for all subjects. Besides this, eSaral also offers NCERT Solutions, Previous year questions for JEE Main and Advance, Practice questions, Test Series for JEE Main, JEE Advanced and NEET, Important questions of Physics, Chemistry, Math, and Biology and many more. Download eSaral app for free study material and video tutorials. Simulator Previous Years AIEEE/JEE Main Questions 
[AIEEE-2012] 
(1) $\mathrm{p}_{0} \mathrm{v}_{0}$ ( 2)$\left(\frac{13}{2}\right) \mathrm{p}_{0} \mathrm{v}_{0}$ ( 3)$\left(\frac{11}{2}\right) \mathrm{p}_{0} \mathrm{v}_{0}$ (4) $4 \mathrm{p}_{0} \mathrm{v}_{0}$ [jEE-Mains-2013] 
[jEE-Mains-2014] 
(1) $\frac{9 \mathrm{P}_{0} \mathrm{V}_{0}}{\mathrm{nR}}$ (1) $\frac{9 \mathrm{P}_{0} \mathrm{V}_{0}}{\mathrm{nR}}$ (3) $\frac{3 \mathrm{P}_{0} \mathrm{V}_{0}}{2 \mathrm{nR}}$ (4) $\frac{9 \mathrm{P}_{0} \mathrm{V}_{0}}{2 \mathrm{nR}}$ [jEE-Mains-2016]
Frequently Asked Questions
Find answers to common questions.
Is NCERT enough for Thermodynamics in JEE Main?
NCERT is necessary but not sufficient. NCERT builds the conceptual framework — definitions, laws, and basic derivations. JEE Main questions then apply these concepts to multi-step numerical problems and graph-based analysis. After mastering NCERT, practise previous year questions and timed mock tests to bridge the gap. Start with NCERT Solutions for Class 11 Physics as the foundation
What are the most important topics in Thermodynamics for JEE Main?
The highest-priority topics are Carnot engine efficiency, work done in cyclic processes using P-V diagrams, adiabatic expansion (TV^(γ-1) = constant), and the relationship between Cp and Cv using Mayer's relation. Together, these cover roughly 70% of all thermodynamics questions asked in JEE Main
How many questions come from Thermodynamics in JEE Main?
JEE Main typically includes 1 to 3 questions from Thermodynamics in each session. The exact number varies by paper, but the chapter has appeared in every year from 2009 to 2023 without exception. Based on NTA's official syllabus, it falls under Unit 6 of JEE Main Physics and carries consistent weightage of 4–12 marks per session.
How do I remember the sign convention for work done in JEE Main Thermodynamics?
JEE Main follows the physics convention: W is work done by the gas. So in expansion, W > 0 (gas loses energy doing work). In compression, W < 0 (work is done on the gas, increasing its energy). The First Law then reads ΔU = Q – W. Some Chemistry textbooks use ΔU = Q + W (where W is work done on the gas) — this is the opposite sign convention, so always confirm which one the question is using.
What does free expansion mean and why is the temperature unchanged?
Free expansion occurs when a gas expands into a vacuum — there is no external pressure to push against, so the gas does zero work (W = 0). Since the container is insulated, heat exchange is also zero (Q = 0). By the First Law, ΔU = Q – W = 0, meaning internal energy and therefore temperature remain unchanged. Only pressure and volume change.
What is the Carnot efficiency formula used in JEE Main?
The Carnot efficiency formula is η = 1 – T₂/T₁, where T₁ is the temperature of the hot source and T₂ is the temperature of the cold sink, both in Kelvin. This is the maximum possible efficiency for any heat engine operating between those two temperatures. JEE Main questions typically give you either the efficiency or one temperature and ask you to find the other.