Thermodynamics JEE Main PYQs PDF, 2020–2026

Thermodynamics questions per year

in the free PDF asked, not in the PDFThe PDF only has questions we can print in full with a checked answer, so it holds 146 of the 150 asked.

Topic-wise weightage by year

How many Thermodynamics questions each topic had in every JEE Main year (all shifts), counting every question asked, including ones not in the PDF. Darker cells mean more questions.

Swipe the table sideways for older years.

Newest questions (2026)

The 12 newest of the 16 JEE Main 2026 Thermodynamics questions in the free PDF, latest shift first. The 2026 papers asked 19 in all.

1. JEE Main 2026 · 8 Apr · Shift 2 · Thermodynamic Processes

   Initial pressure and volume of a monoatomic ideal gas are $P$ and $V$. The change in internal energy of this gas in adiabatic expansion to volume $V_{{\text{final}}}=27{\ \mathrm{V}}$ is $\_\_\_\_$ J.

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2. JEE Main 2026 · 6 Apr · Shift 2 · Thermodynamic Processes

   A cylinder with adiabatic walls is closed at both ends and is divided into two compartments by a frictionless adiabatic piston. Ideal gas is filled in both (left and right) the compartments at same $P,V$,

   T. Heating is started from left side until pressure changes to $27{\mathrm{P}}/8$. If initial volume of each compartment was 9 litres then the final volume in right-hand side compartment is $\_\_\_\_$ litres. (for this ideal gas ${\mathrm{C}}_{{{\mathrm{P}}}}/{\mathrm{C}}_{{{\mathrm{V}}}}=1.5$ )

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3. JEE Main 2026 · 5 Apr · Shift 1 · First Law of Thermodynamics

   Consider the following statements:

   A. Zeroth law of thermodynamics gives concept of temperature

   B. First law of thermodynamics gives concept of internal energy

   C. In isothermal expansion of ideal gas, $\Delta Q\neq \Delta W$

   D. Product of intensive and extensive variables is extensive

   E. The ratio of any extensive variable to mass will be an extensive variable

   Choose the correct combination of statements from the options given below:

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4. JEE Main 2026 · 5 Apr · Shift 1 · Thermodynamic Processes

   Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason ${\mathbf{R}}$

   Statement I : Change in internal energy of a system containing $n$ mole of ideal gas can be written as $\Delta{\mathrm{U}}=n{\mathrm{C}}_{v}(T_{{{\mathrm{f}}}}-T_{i})=\frac{nR}{\gamma-1}(T_{{{\mathrm{f}}}}-T_{i})$, where $\gamma=\frac{C_{p}}{C_{v}},T_{i}=$ initial temperature, $T_{{{\mathrm{f}}}}=$ final temperature.

   Statement II : Relation between degree of freedom $f$ and $\gamma(=C_{p}/C_{v})$ is $\left(\gamma=1+\frac{2}{f}\right)$

   Choose the correct answer from the options given below

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5. JEE Main 2026 · 2 Apr · Shift 1 · Thermodynamic Processes

   A vessel contains 0.15 m³ of a gas at pressure 8 bar and temperature 140 °C with $c_{p}=3R$ and $c_{v}=2R$. It is expanded adiabatically till pressure falls to 1 bar. The work done during this process is _________ kJ. (R is gas constant)

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6. JEE Main 2026 · 2 Apr · Shift 1 · Thermodynamic Processes

   Heat is supplied to a diatomic gas at constant pressure. Then the ratio of $\Delta Q:\Delta U:\Delta W$ is ______.

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7. JEE Main 2026 · 2 Apr · Shift 2 · First Law of Thermodynamics

   5 moles of unknown gas is heated at constant volume from 10°C to 20°C. The molar specific heat of this gas at constant pressure $c_{p}=8$ cal/mol.°C and $R=8.36$ J/mol.°C. The change in the internal energy of the gas is __________ calorie.

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8. JEE Main 2026 · 28 Jan · Shift 1 · Thermodynamic Processes

   In the following $p-V$ diagram the equation of state along the curved path is given by $(V-2)^{2}=4ap$ where $a$ is a constant. The total work done in the closed path is

   
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9. JEE Main 2026 · 28 Jan · Shift 2 · Thermodynamic Processes

   A thermodynamic system is taken through the cyclic process ABC as shown in the figure. The total work done by the system during the cycle ABC is ______ J.

   
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10. JEE Main 2026 · 24 Jan · Shift 2 · Thermodynamic Processes

    10 mole of an ideal gas is undergoing the process shown in the figure. The heat involved in the process from $P_{1}$ to $P_{2}$ is $\alpha$ Joule ( $P_{1}=21.7{\ \mathrm{Pa}}$ and $P_{2}=30{\ \mathrm{Pa}},{\mathrm{C}}_{v}=21{\ \mathrm{J}}/{\mathrm{K}}.{\mathrm{mol}},R=8.3{\ \mathrm{J}}/{\mathrm{mol}}.{\mathrm{K}})$. The value of $\alpha$ is $\_\_\_\_$ .

    
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11. JEE Main 2026 · 24 Jan · Shift 1 · First Law of Thermodynamics

    Density of water at $4^{{\circ}}{\mathrm{C}}$ and ${20}^{{\circ}}{\mathrm{C}}$ are $1000{\ \mathrm{kg}}/{\mathrm{m}}^{3}$ and $998{\ \mathrm{kg}}/{\mathrm{m}}^{3}$ respectively. The increase in internal energy of 4 kg of water when it is heated from $4^{{\circ}}{\mathrm{C}}$ to ${20}^{{\circ}}{\mathrm{C}}$ is $\_\_\_\_$ J.

    (specific heat capacity of water $=4.2{\ \mathrm{J}}/{\mathrm{kg}}$. and 1 atmospheric pressure $={10}^{5}{\ \mathrm{Pa}}$ )

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12. JEE Main 2026 · 23 Jan · Shift 2 · Thermodynamic Processes

    The internal energy of a monoatomic gas is 3nRT. One mole of helium is kept in a cylinder having internal cross section area of $17{\ \mathrm{cm}}^{2}$ and fitted with a light movable frictionless piston. The gas is heated slowly by suppling 126 J heat. If the temperature rises by $4^{{\circ}}{\mathrm{C}}$, then the piston will move $\_\_\_\_$ cm.

    (atmospheric pressure $={10}^{5}{\ \mathrm{Pa}}$ )

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Sample questions from recent papers

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