In an adiabatic process, which of the following statements is true?

The molar heat capacity is zero

The internal energy of the gas decreases as the temperature increases

Work done by the gas equals the increase in internal energy

The molar heat capacity is infinite

During the melting of a slab of ice at 273 K at atmospheric pressure :

Positive work is done on the ice-water system by the atmosphere.

Internal energy of ice-water system remains unchanged.

Positive work is done by the ice-water system on the atmosphere.

Internal energy of the ice-water system decreases.

Heat And Thermodynamics — JEE Main Previous Year Questions

394 solved PYQs · 2016–2026 · Physics

Solved PYQs: 394
Years covered: 2016–2026
Avg / year: ~36
Subject: Physics

How many JEE Main questions come from Heat And Thermodynamics?

Heat And Thermodynamics has contributed 394 questions to Joint Entrance Examination (Main) papers between 2016 and 2026 — an average of about 36 questions a year. That count is measured from EByAi’s bank of 55,289 JEE Main questions, not estimated from a syllabus. Every one of the 394 questions carries a written, step-by-step solution, and each is tagged to Heat And Thermodynamics within Physics, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample Heat And Thermodynamics questions from real JEE Main papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 394 Heat And Thermodynamics questions (with full written solutions) are available in practice.

Question 1 · JEE Main 2026
The r.m.s. speed of oxygen molecules at 47 °C is equal to that of the hydrogen molecules kept at _________ °C. (Mass of oxygen molecule/mass of hydrogen molecule = 32/2)
1. (A) $-100$
2. (B) $-253$
3. (C) $-20$
4. (D) $-235$
Show answerAnswer
$Answer: (B) -253$
Question 2 · JEE Main 2026
A mixture of carbon dioxide and oxygen has volume 8310 cm 3 , temperature 300 K, pressure 100 kPa and mass 13.2 g. The number of moles of carbon dioxide and oxygen gases in the mixture respectively are ______. (Assume both carbon dioxide and oxygen gases behave like ideal gases) [R = 8.31 J/mol K]
1. (A) $0.15 and 0.18$
2. (B) $0.25 and 0.08$
3. (C) $0.21 and 0.12$
4. (D) $0.13 and 0.20$
Show answerAnswer
$Answer: (C) 0.21 and 0.12$
Question 3 · JEE Main 2025
In an adiabatic process, which of the following statements is true?
1. (A) $The internal energy of the gas decreases as the temperature increases$
2. (B) $The molar heat capacity is zero$
3. (C) $Work done by the gas equals the increase in internal energy$
4. (D) $The molar heat capacity is infinite$
Show answerAnswer
$Answer: (B) The molar heat capacity is zero$
Question 4 · JEE Main 2025
During the melting of a slab of ice at 273 K at atmospheric pressure :
1. (A) $Internal energy of ice-water system remains unchanged.$
2. (B) $Positive work is done by the ice-water system on the atmosphere.$
3. (C) $Positive work is done on the ice-water system by the atmosphere.$
4. (D) $Internal energy of the ice-water system decreases.$
Show answerAnswer
$Answer: (C) Positive work is done on the ice-water system by the atmosphere.$
Question 5 · JEE Main 2025
The work done in an adiabatic change in an ideal gas depends upon only :
1. (A) $change in its pressure$
2. (B) $change in its temperature$
3. (C) $change in its specific heat$
4. (D) $change in its volume$
Show answerAnswer
$Answer: (B) change in its temperature$

Heat And Thermodynamics questions by year

Year	Questions	Share of chapter questions
2026	37
2025	50
2024	44
2023	49
2022	50
2021	62
2020	37
2019	43
2018	5
2017	10
2016	7

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FAQs

How many JEE Main questions have been asked from Heat And Thermodynamics?

EByAi's bank holds 394 real JEE Main questions from Heat And Thermodynamics, asked between 2016 and 2026 — about 36 per year on average. Every count is measured from actual papers, not estimated.

Is Heat And Thermodynamics important for JEE Main?

394 questions over 11 papers make Heat And Thermodynamics a high-weightage chapter in JEE Main Physics. The year-wise table above shows exactly how often it appears.

Can I solve Heat And Thermodynamics PYQs online for free?

Yes. EByAi lets you solve JEE Main past-year questions in the browser with written solutions — free daily practice, no card needed.

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