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Physics - Kinetic Theory of Gases

Practise 166 JEE Main previous year questions on Kinetic Theory of Gases, compiled from papers spanning 2002 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Main tests.

Kinetic Theory of Gases has been asked in 23 of the 25 years of JEE Main papers analysed (2002–2026), with 166 questions in all. 51% of them were easy, 43% moderate and 7% tough. Most of its questions came from 2021, with 26 questions that year. In the last three years (2024–2026) it had 35 questions across 49 papers, about 0.7 per paper.

The chapter's 4 topics are not weighted equally: Degree of Freedom and Specific Heat (54 questions, 33%), Pressure and Energy of gas (48 questions, 29%), and Speed of Gas (45 questions, 27%) have been asked the most. Over the last five years the most frequent topics have been Speed of Gas (25), Degree of Freedom and Specific Heat (20), and Pressure and Energy of gas (17). Pressure and Energy of gas has produced the most tough questions (7).

  1. 1If mole of an ideal monoatomic gas at temperature , is mixed with mole of another ideal monoatomic gas at temperature then the temperature o06 Apr, 2026 (E)Pressure and Energy of gas
  2. 2Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Statement I: Change in internal energy 05 Apr, 2026 (M)Degree of Freedom and Specific Heat
  3. 3One gas of mole of molecules at temperature , volume , and pressure , and another gas of mole of molecules at temperature , volume , and pre04 Apr, 2026 (M)Gas Laws
  4. 4Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: If the average kinetic ene04 Apr, 2026 (E)Pressure and Energy of gas
  5. 5A mixture of carbon dioxide and oxygen has volume cm , temperature K, pressure kPa and mass g. The number of moles of carbon dioxide and oxy02 Apr, 2026 (E)Gas Laws
  6. 6The mean free path of a molecule of diameter at the temperature and pressure , is given as m. (Given ).28 Jan, 2026 (E)Gas Laws
  7. 7A gas of certain mass filled in a closed cylinder at a pressure of 3.23 kPa has temperature . The gas is now heated to double its temperatur24 Jan, 2026 (M)Gas Laws
  8. 8The volume of an ideal gas increases 8 times and temperature becomes of initial temperature during a reversible change. If there is no excha22 Jan, 2026 (M)Degree of Freedom and Specific Heat
  9. 9A cylindrical tube of length , closed at both ends contains an ideal gas of 1 mol having molecular weight . The tube is rotated in a horizon22 Jan, 2026 (M)Pressure and Energy of gas
  10. 10Consider two boxes containing ideal gases and such that their temperatures, pressures and number densities are same. The molecular size of i22 Jan, 2026 (E)Gas Laws
  11. 11The r.m.s. speed of oxygen molecules at is equal to that of the hydrogen molecules kept at . (Mass of oxygen molecule/mass of hydrogen molec21 Jan, 2026 (E)Speed of Gas
  12. 12Match the with Choose the answer from the options given below :07 Apr, 2025 (M)Degree of Freedom and Specific Heat
  13. 13The helium and argon are put in the flask at the same room temperature ( 300 K). The ratio of average kinetic energies (per molecule) of hel07 Apr, 2025 (E)Pressure and Energy of gas
  14. 14The mean free path and the average speed of oxygen molecules at 300 K and 1 atm are and respectively. Find the frequency of its collisions.04 Apr, 2025 (M)Speed of Gas
  15. 15is the specific heat ratio of monoatomic gas A having 3 translational degrees of freedom. is the specific heat ratio of polyatomic gas B hav02 Apr, 2025 (M)Degree of Freedom and Specific Heat
  16. 16For a particular ideal gas which of the following graphs represents the variation of mean squared velocity of the gas molecules with tempera28 Jan, 2025 (M)Speed of Gas
  17. 17The kinetic energy of translation of the molecules in 50 g of gas at is28 Jan, 2025 (E)Pressure and Energy of gas
  18. 18The ratio of vapour densities of two gases at the same temperature is , then the ratio of r.m.s. velocities will be:28 Jan, 2025 (E)Speed of Gas
  19. 19The temperature of a gas is and the average translational kinetic energy of its molecules is . The temperature at which the average translat09 Apr, 2024 (E)Pressure and Energy of gas
  20. 20A mixture of one mole of monoatomic gas and one mole of a diatomic gas (rigid) are kept at room temperature . The ratio of specific heat of 08 Apr, 2024 (M)Degree of Freedom and Specific Heat
  21. 21Given below are two statements : Statement (I) : The mean free path of gas molecules is inversely proportional to square of molecular diamet08 Apr, 2024 (E)Pressure and Energy of gas
  22. 22A sample contains mixture of helium and oxygen gas. The ratio of root mean square speed of helium and oxygen in the sample, is:06 Apr, 2024 (M)Speed of Gas
  23. 23The specific heat at constant pressure of a real gas obeying equation is:06 Apr, 2024 (M)Degree of Freedom and Specific Heat
  24. 24Energy of 10 non rigid diatomic molecules at temperature is :06 Apr, 2024 (E)Pressure and Energy of gas
  25. 25If the collision frequency of hydrogen molecules in a closed chamber at is , then the collision frequency of the same system at is :05 Apr, 2024 (M)Gas Laws
  26. 26During an adiabatic process, if the pressure of a gas is found to be proportional to the cube of its absolute temperature, then the ratio of05 Apr, 2024 (E)Degree of Freedom and Specific Heat
  27. 27If is the number density and is the diameter of the molecule, then the average distance covered by a molecule between two successive collisi05 Apr, 2024 (E)Speed of Gas
  28. 28The translational degrees of freedom and rotational degrees of freedom of molecule are:04 Apr, 2024 (E)Degree of Freedom and Specific Heat
  29. 29Two moles of a monoatomic gas is mixed with six moles of a diatomic gas. The molar specific heat of the mixture at constant volume is :01 Feb, 2024 (M)Degree of Freedom and Specific Heat
  30. 30If the root mean square velocity of hydrogen molecule at a given temperature and pressure is 2 km s - 1 , the root mean square velocity of o01 Feb, 2024 (E)Speed of Gas
  31. 31The parameter that remains the same for molecules of all gases at a given temperature is :31 Jan, 2024 (M)Gas Laws
  32. 32A gas mixture consists of 8 moles of argon and 6 moles of oxygen at temperature T . Neglecting all vibrational modes, the total internal ene31 Jan, 2024 (E)Pressure and Energy of gas
  33. 33At which temperature the r.m.s. velocity of a hydrogen molecule equal to that of an oxygen molecule at 47 ° C ?30 Jan, 2024 (M)Speed of Gas
  34. 34Two thermodynamical process are shown in the figure. The molar heat capacity for process A and B are C A and C B . The molar heat capacity a30 Jan, 2024 (M)Degree of Freedom and Specific Heat
  35. 35If three moles of monoatomic gas γ = 5 3 is mixed with two moles of a diatomic gas γ = 7 5 , the value of adiabatic exponent γ for the mixtu30 Jan, 2024 (E)Degree of Freedom and Specific Heat
  36. 36Two vessels A and B are of the same size and are at same temperature. A contains 1 g of hydrogen and B contains 1 g of oxygen. P A and P B a29 Jan, 2024 (M)Pressure and Energy of gas
  37. 37The temperature of a gas having 2 . 0 × 10 25 molecules per cubic meter at 1 . 38 atm (Given, k = 1 . 38 × 10 - 23 J K - 1 ) is :29 Jan, 2024 (E)Gas Laws
  38. 38N moles of a polyatomic gas ( f = 6 ) must be mixed with two moles of a monoatomic gas so that the mixture behaves as a diatomic gas. The va29 Jan, 2024 (E)Degree of Freedom and Specific Heat
  39. 39The average kinetic energy of a monatomic molecule is 0 . 414 eV at temperature: (Use K B = 1 . 38 × 10 - 23 J mol - 1 K - 1 )27 Jan, 2024 (M)Pressure and Energy of gas
  40. 40The total kinetic energy of 1 mole of oxygen at 27 ° C is : [Use universal gas constant ( R ) = 8 . 31 J mol - 1 K - 1 ]27 Jan, 2024 (E)Pressure and Energy of gas
  41. 41A flask contains Hydrogen and Argon in the ratio 2 : 1 by mass. The temperature of the mixture is 30 C . The ratio of average kinetic energy15 Apr, 2023 (M)Pressure and Energy of gas
  42. 42The rms speed of oxygen molecule in a vessel at particular temperature is 1 + 5 x 1 2 v , when v is the average speed of the molecule. The v13 Apr, 2023 (M)Speed of Gas
  43. 43The mean free path of molecules of a certain gas at STP is 1500 d , where d is the diameter of the gas molecules. While maintaining the stan13 Apr, 2023 (E)Speed of Gas
  44. 44If the r.m.s speed of chlorine molecule is 490 m s - 1 at 27 o C , the r.m.s speed of argon molecules at the same temperature will be (Atomi12 Apr, 2023 (M)Speed of Gas
  45. 45Three vessels of equal volume contain gases at the same temperature and pressure. The first vessel contains neon (monoatomic), the second co11 Apr, 2023 (M)Speed of Gas
  46. 46The root mean square speed of molecules of nitrogen gas at 27 C is approximately: (Given mass of a nitrogen molecule = 4 . 6 10 - 26 kg and 11 Apr, 2023 (E)Speed of Gas
  47. 47Match List I with List II: List I List II (A) 3 Translational degrees of freedom (I) Monoatomic gases (B) 3 Translational, 2 rotational degr10 Apr, 2023 (M)Degree of Freedom and Specific Heat
  48. 48A gas mixture consists of 2 moles of oxygen and 4 moles of neon at temperature T . Neglecting all vibrational modes, the total internal ener10 Apr, 2023 (E)Degree of Freedom and Specific Heat
  49. 49The temperature at which the kinetic energy of oxygen molecules becomes double than its value at 27 C is08 Apr, 2023 (E)Pressure and Energy of gas
  50. 50The number of air molecules per cm 3 is increased from 3 10 19 to 12 10 19 . The ratio of collision frequency of air molecules before and af06 Apr, 2023 (M)Gas Laws

Frequently Asked Questions

1.How many questions are available for Kinetic Theory of Gases?

This chapter includes 166 questions compiled from JEE Main papers spanning 2002 to 2026.

2.Are these questions only from JEE Main, or from other exams too?

These are JEE Main questions specifically for the Kinetic Theory of Gases chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is Kinetic Theory of Gases an important chapter for JEE Main Physics?

Kinetic Theory of Gases has appeared in 23 of the 25 years of JEE Main papers covered here, with 166 questions across 142 papers - about one per paper it appears in.

4.What is the difficulty level of Kinetic Theory of Gases questions in JEE Main?

Of the 166 questions analysed for this chapter, 51% are easy, 43% moderate and 7% tough. 2021 had the most, with 26 questions.

5.Which topics in Kinetic Theory of Gases should I focus on?

These topics have carried the most weightage in Kinetic Theory of Gases:

  • Degree of Freedom and Specific Heat - 54 questions (33%)
  • Pressure and Energy of gas - 48 questions (29%)
  • Speed of Gas - 45 questions (27%)
  • Pressure and Energy of gas has produced the most tough questions (7).
6.Is Kinetic Theory of Gases's weightage in JEE Main going up or down?

Across all 142 papers analysed, Kinetic Theory of Gases has averaged about 1.2 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.