Kinetic Theory of Gases JEE Main PYQs PDF, 2020–2026

Kinetic Theory of Gases 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 130 of the 131 asked.

Topic-wise weightage by year

How many Kinetic Theory of Gases 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 13 JEE Main 2026 Kinetic Theory of Gases questions in the free PDF, latest shift first.

1. JEE Main 2026 · 6 Apr · Shift 1 · Ideal Gas Equation

   Two closed vessels of same volume are joined through a narrow tube and both vessels are filled with air of pressure 90 kPa and temperature 400 K . Keeping the temperature of one vessel constant at 400 K the second vessel temperature is raised to 500 K . The final pressure in the vessels is $\_\_\_\_$ kPa .

   Solve it online →

2. JEE Main 2026 · 6 Apr · Shift 2 · Degrees of Freedom and Equipartition

   If 2 mole of an ideal monoatomic gas at temperature $T$, is mixed with 6 mole of another ideal monoatomic gas at temperature $2T$ then the temperature of mixture is:

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3. JEE Main 2026 · 5 Apr · Shift 2 · Ideal Gas Equation

   An ideal gas at pressure $P$ and temperature $T$ is expanding such that $PT^{3}=$ constant. The coefficient of volume expansion of the gas is $\_\_\_\_$ .

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4. JEE Main 2026 · 4 Apr · Shift 2 · Kinetic Theory Assumptions

   Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

   Assertion A : If the average kinetic energy of ${\mathrm{H}}_{2}$ and ${\mathrm{O}}_{2}$ molecules, kept in two different sized containers are same, then their temperatures will be same.

   Reason R : The r.m.s speed of ${\mathrm{H}}_{2}$ and ${\mathrm{O}}_{2}$ molecules are same at same temperature.

   Choose the correct answer from the options given below

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5. JEE Main 2026 · 4 Apr · Shift 1 · Ideal Gas Equation

   One gas of $n_{1}$ mole of molecules at temperature $T_{1}$, volume $V_{1}$, and pressure $P_{1}$, and another gas of $n_{2}$ mole of molecules at temperature $T_{2}$, volume $V_{2}$, and pressure $P_{2}$, are mixed resulting in pressure $P$ and volume $V$ of the mixture. The temperature of the mixture is $\_\_\_\_$ .
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6. JEE Main 2026 · 2 Apr · Shift 2 · Ideal Gas Equation

   A mixture of carbon dioxide and oxygen has volume 8310 cm³, 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]

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7. JEE Main 2026 · 28 Jan · Shift 2 · Mean Free Path

   The mean free path of a molecule of diameter $5\times {10}^{{-10}}$ m at the temperature ${41}^{{\circ}}$C and pressure $1.38\times {10}^{5}$ Pa, is given as ________ m. (Given $k_{B}=1.38\times {10}^{{-23}}$ J/K).

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8. JEE Main 2026 · 24 Jan · Shift 1 · Ideal Gas Equation

   A gas of certain mass filled in a closed cylinder at a pressure of 3.23 kPa has temperature ${50}^{{\circ}}{\mathrm{C}}$. The gas is now heated to double its temperature on the Celsius scale. The modified pressure is $\_\_\_\_$ Pa .

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9. JEE Main 2026 · 23 Jan · Shift 2 · Ideal Gas Equation

   An air bubble of volume $2.9{\ \mathrm{cm}}^{3}$ rises from the bottom of a swimming pool of 5 m deep. At the bottom of the pool water temperature is ${17}^{{\circ}}{\mathrm{C}}$. The volume of the bubble when it reaches the surface, where the water temperature is ${27}^{{\circ}}{\mathrm{C}}$, is $\_\_\_\_$ ${\mathrm{cm}}^{3}$.

   ( ${\mathrm{g}}=10{\ \mathrm{m}}/{\mathrm{s}}^{2}$, density of water $={10}^{3}{\ \mathrm{kg}}/{\mathrm{m}}^{3}$, and 1 atm pressure is ${10}^{5}{\ \mathrm{Pa}}$ )

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10. JEE Main 2026 · 22 Jan · Shift 2 · Ideal Gas Equation

    An insulated cylinder of volume $60{\ \mathrm{cm}}^{3}$ is filled with a gas at ${27}^{{\circ}}{\mathrm{C}}$ and 2 atmospheric pressure. Then the gas is compressed making the final volume as $20{\ \mathrm{cm}}^{3}$ while allowing the temperature to rise to ${77}^{{\circ}}{\mathrm{C}}$. The final pressure is $\_\_\_\_$ atmospheric pressure.

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11. JEE Main 2026 · 22 Jan · Shift 2 · Mean Free Path

    Consider two boxes containing ideal gases $A$ and $B$ such that their temperatures, pressures and number densities are same. The molecular size of $A$ is half of that of $B$ and mass of molecule $A$ is four times that of $B$. If the collision frequency in gas $B$ is $32\times {10}^{{18}}/{\mathrm{s}}$ then collision frequency in gas $A$ is $\_\_\_\_$ /s.

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12. JEE Main 2026 · 22 Jan · Shift 1 · Ideal Gas Equation

    A cylindrical tube $AB$ of length $l$, closed at both ends contains an ideal gas of 1 mol having molecular weight $M$. The tube is rotated in a horizontal plane with constant angular velocity $\omega$ about an axis perpendicular to $AB$ and passing through the edge at end $A$, as shown in the figure. If $P_{A}$ and $P_{B}$ are the pressures at $A$ and $B$ respectively, then (Consider the temperature is same at all points in the tube)

    
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Practise the 2026 Kinetic Theory of Gases questions online

Sample questions from recent papers

The free PDF above has all 130 questions grouped by topic, with an answer key.

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