Jump to a section

Physics - Thermodynamics

Practise 232 JEE Main previous year questions on Thermodynamics, 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.

Thermodynamics has been asked in 24 of the 25 years of JEE Main papers analysed (2002–2026), with 232 questions in all. 42% of them were easy, 47% moderate and 12% tough. Most of its questions came from 2021, with 32 questions that year. In the last three years (2024–2026) it had 53 questions across 49 papers, about 1.1 per paper.

The chapter's 4 topics are not weighted equally: Thermodynamic Processes (127 questions, 55%), Heat Engine, Refrigerator and Second Law of Thermodynamics (52 questions, 22%), and First Law of Thermodynamics (42 questions, 18%) have been asked the most. Thermodynamic Processes has also led over the last five years, with 62 questions. Thermodynamic Processes has produced the most tough questions (14).

  1. 1One mole of diatomic gas having rotational modes only is kept in a cylinder with a piston system. The cross-section area of the cylinder is 08 Apr, 2026 (E)First Law of Thermodynamics
  2. 2Initial pressure and volume of a monoatomic ideal gas are and . The change in internal energy of this gas in adiabatic expansion to volume i08 Apr, 2026 (E)First Law of Thermodynamics
  3. 3Two closed vessels of same volume are joined through a narrow tube and both vessels are filled with air of pressure kPa and temperature K. K06 Apr, 2026 (M)Thermodynamic Processes
  4. 4A certain gas is isothermally compressed to of its initial volume ( litre) by applying required pressure. If the bulk modulus of the gas is 06 Apr, 2026 (M)Thermodynamic Processes
  5. 5A cylinder with adiabatic walls is closed at both ends and is divided into two compartments by a frictionless adiabatic piston. Ideal gas is06 Apr, 2026 (E)Thermodynamic Processes
  6. 6Consider the following statements: A. Zeroth law of thermodynamics gives concept of temperature B. First law of thermodynamics gives concept05 Apr, 2026 (M)Thermodynamic Systems
  7. 7An ideal gas at pressure and temperature is expanding such that constant. The coefficient of volume expansion of the gas is _______.05 Apr, 2026 (E)Thermodynamic Processes
  8. 8An ideal gas undergoes a process maintaining relation between pressure and volume as , where and are constants. If two samples and (two mole04 Apr, 2026 (M)Thermodynamic Processes
  9. 9Heat is supplied to a diatomic gas at constant pressure. Then the ratio of is _______.02 Apr, 2026 (M)First Law of Thermodynamics
  10. 10A vessel contains m of a gas at pressure bar and temperature C with and . It is expanded adiabatically till pressure falls to bar. The work 02 Apr, 2026 (M)Thermodynamic Processes
  11. 11moles of unknown gas is heated at constant volume from to . The molar specific heat of this gas at constant pressure cal/mol.°C and J/mol.°C02 Apr, 2026 (E)First Law of Thermodynamics
  12. 12In the following diagram the equation of state along the curved path is given by where is a constant. The total work done in the closed path28 Jan, 2026 (M)Thermodynamic Processes
  13. 13A thermodynamic system is taken through the cyclic process as shown in the figure. The total work done by the system during the cycle is J.28 Jan, 2026 (E)Thermodynamic Processes
  14. 14Density of water at and are and respectively. The increase in internal energy of 4 kg of water when it is heated from to is J. (specific hea24 Jan, 2026 (M)First Law of Thermodynamics
  15. 1510 mole of an ideal gas is undergoing the process shown in the figure. The heat involved in the process from to is Joule ( and . The value o24 Jan, 2026 (E)First Law of Thermodynamics
  16. 16When 300 J of heat given to an ideal gas with its temperature raises from to keeping its volume constant. If n is the number of moles of the24 Jan, 2026 (E)Thermodynamic Processes
  17. 17One mole of an ideal diatomic gas expands from volume to 2 V isothermally at a temperature and does joule of work. If the gas undergoes same23 Jan, 2026 (E)Thermodynamic Processes
  18. 18The internal energy of a monoatomic gas is 3 nRT. One mole of helium is kept in a cylinder having internal cross section area of and fitted 23 Jan, 2026 (E)First Law of Thermodynamics
  19. 19An insulated cylinder of volume is filled with a gas at and 2 atmospheric pressure. Then the gas is compressed making the final volume as wh22 Jan, 2026 (E)Thermodynamic Processes
  20. 2010 mole of oxygen is heated at constant volume from to . The change in the internal energy of the gas is cal. (The molecular specific heat o21 Jan, 2026 (M)First Law of Thermodynamics
  21. 21A diatomic gas does 100 J of work when it is expanded isobarically. Then the heat given to the gas J.21 Jan, 2026 (E)Thermodynamic Processes
  22. 22A monoatomic gas having is stored in a thermally insulated container and the gas is suddenly compressed to of its initial volume. The ratio 08 Apr, 2025 (E)Thermodynamic Processes
  23. 23An ideal gas has undergone through the cyclic process as shown in the figure. Work done by the gas in the entire cycle is ______ . (Take )07 Apr, 2025 (M)Thermodynamic Processes
  24. 24Match List-I with List-II. Choose the correct answer from the options given below :07 Apr, 2025 (E)Thermodynamic Processes
  25. 25Match List-I with List-II. \( {array}{|l|l|l|l|} & {List - I} & & {List - II} \\ { (A) } & { Isobaric } & { (I) } & Q= W \\ { (B) } & { Isoc04 Apr, 2025 (E)Thermodynamic Processes
  26. 26There are two vessels filled with an ideal gas where volume of one is double the volume of other. The large vessel contains the gas at 8 kPa04 Apr, 2025 (E)Thermodynamic Systems
  27. 27During the melting of a slab of ice at 273 K at atmospheric pressure :03 Apr, 2025 (M)First Law of Thermodynamics
  28. 28A gas is kept in a container having walls which are thermally non-conducting. Initially the gas has a volume of and temperature . The change03 Apr, 2025 (M)Thermodynamic Processes
  29. 29Pressure of an ideal gas, contained in a closed vessel, is increased by when heated by . Its initial temperature must be :03 Apr, 2025 (E)Thermodynamic Processes
  30. 30An ideal gas exists in a state with pressure volume .It is isothermally expanded to 4 times of its initial volume , then isobarically compre03 Apr, 2025 (E)Thermodynamic Processes
  31. 31In an adiabatic process, which of the following statements is true?02 Apr, 2025 (M)Thermodynamic Processes
  32. 32The internal energy of air in sized room at 1 atmospheric pressure will be _______ . (Consider air as diatomic molecule)02 Apr, 2025 (E)First Law of Thermodynamics
  33. 33Identify the characteristics of an adiabatic process in a monoatomic gas. (A) Internal energy is constant. (B) Work done in the process is e02 Apr, 2025 (E)Thermodynamic Processes
  34. 34The workdone in an adiabatic change in an ideal gas depends upon only :29 Jan, 2025 (M)Thermodynamic Processes
  35. 35A container of fixed volume contains a gas at \(27^{ } {C}\). To double the pressure of the gas, the temperature of gas should be raised to 29 Jan, 2025 (M)Thermodynamic Processes
  36. 36Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : With the increase 29 Jan, 2025 (E)Thermodynamic Processes
  37. 37A poly-atomic molecule ( , where is gas constant) goes from phase space point to point to point . A to B is an adiabatic path and to is an i29 Jan, 2025 (E)Thermodynamic Processes
  38. 38A Carnot engine is working between two temperatures 473 K and 273 K . In a new system two engines - engine works between 473 K to 373 K and 28 Jan, 2025 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  39. 39An ideal gas goes from an initial state to final state. During the process, the pressure of gas increases linearly with temperature. A. The 24 Jan, 2025 (M)Thermodynamic Systems
  40. 40The temperature of 1 mole of an ideal monoatomic gas is increased by at constant pressure. The total heat added and change in internal energ24 Jan, 2025 (M)First Law of Thermodynamics
  41. 41The magnitude of heat exchanged by a system for the given cyclic process ABCA (as shown in figure) is (in SI unit) :24 Jan, 2025 (E)First Law of Thermodynamics
  42. 42Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In an insulated co24 Jan, 2025 (E)First Law of Thermodynamics
  43. 43\[ {array}{|l|p{6cm}|l|p{4cm}|} {LIST-I} & & {LIST-II} & \\ A. & {Pressure varies inversely with volume of an ideal gas.} & I. & {Adiabatic 23 Jan, 2025 (M)Thermodynamic Systems
  44. 44An ideal gas initially at temperature, is compressed suddenly to one fourth of its volume. If the ratio of specific heat at constant pressur23 Jan, 2025 (M)Thermodynamic Processes
  45. 45Water of mass gram is slowly heated to increase the temperature from to The change in entropy of the water, given specific heat of water is 23 Jan, 2025 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  46. 46Using the given diagram, the work done by an ideal gas along the path ABCD is :23 Jan, 2025 (E)First Law of Thermodynamics
  47. 47Given are statements for certain thermodynamic variables, (A) Internal energy, volume (V) and mass (M) are extensive variables. (B) Pressure22 Jan, 2025 (E)Thermodynamic Systems
  48. 48For a diatomic gas, if for rigid molecules and for another diatomic molecules, but also having vibrational modes. Then, which one of the fol22 Jan, 2025 (E)Thermodynamic Systems
  49. 49A sample of 1 mole gas at temperature is adiabatically expanded to double its volume. If adiabatic constant for the gas is , then the work d09 Apr, 2024 (M)Thermodynamic Processes
  50. 50The volume of an ideal gas is changed adiabatically from 5 litres to 4 litres. The ratio of initial pressure to final pressure is:09 Apr, 2024 (M)Thermodynamic Processes

Frequently Asked Questions

1.How many questions are available for Thermodynamics?

This chapter includes 232 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 Thermodynamics chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is Thermodynamics an important chapter for JEE Main Physics?

Thermodynamics has appeared in 24 of the 25 years of JEE Main papers covered here, with 232 questions across 173 papers - about one per paper it appears in.

4.What is the difficulty level of Thermodynamics questions in JEE Main?

Of the 232 questions analysed for this chapter, 42% are easy, 47% moderate and 12% tough. 2021 had the most, with 32 questions.

5.Which topics in Thermodynamics should I focus on?

These topics have carried the most weightage in Thermodynamics:

  • Thermodynamic Processes - 127 questions (55%)
  • Heat Engine, Refrigerator and Second Law of Thermodynamics - 52 questions (22%)
  • First Law of Thermodynamics - 42 questions (18%)
  • Thermodynamic Processes has produced the most tough questions (14).
6.Is Thermodynamics's weightage in JEE Main going up or down?

Across all 173 papers analysed, Thermodynamics has averaged about 1.3 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.1 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.