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Physics - Thermodynamics

Practise 45 COMEDK previous year questions on Thermodynamics, compiled from papers spanning 2012 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 COMEDK tests.

Thermodynamics has been asked in 15 of the 15 years of COMEDK papers analysed (2012–2026), with 45 questions in all. 49% of them were easy, 44% moderate and 7% tough. Most of its questions came from 2023, with 8 questions that year. In the last three years (2024–2026) it had 15 questions across 9 papers, about 1.7 per paper.

The chapter's 4 topics are not weighted equally: Thermodynamic Processes (19 questions, 42%), First Law of Thermodynamics (17 questions, 38%), and Heat Engine, Refrigerator and Second Law of Thermodynamics (6 questions, 13%) have been asked the most. Over the last five years the most frequent topics have been First Law of Thermodynamics (14), Thermodynamic Processes (11), and Heat Engine, Refrigerator and Second Law of Thermodynamics (1). Heat Engine, Refrigerator and Second Law of Thermodynamics has produced the most tough questions (2).

  1. 1Two vessels A and B contain same mass of Oxygen and Hydrogen respectively at the same temperature. The volume of B is twice that of A. The r09 May, 2026 (S1)Thermodynamic Systems
  2. 21 kg of water at C is converted to steam at the same temperature. Volume of 1 cc of water changes to cc on boiling. The change in internal e09 May, 2026 (S1)First Law of Thermodynamics
  3. 3Following graph shows four different processes, adiabatic, isothermal, isobaric and isochoric for an ideal gas, from the same initial state.09 May, 2026 (S2)Thermodynamic Processes
  4. 4A thermal source supplies heat at a rate of . By using that heat a system performs work at a rate of . What is the rate at which the interna25 May, 2025 (Shift)First Law of Thermodynamics
  5. 5A sample of an ideal gas is taken through the cyclic process ABCA as shown in figure below. It absorbs 60J of heat during the part AB and re10 May, 2025 (S1)Thermodynamic Processes
  6. 6The ratio of specific heat capacities at constant pressure to that at constant volume for a given mass of a gas is . If the percentage incre10 May, 2025 (S1)Thermodynamic Processes
  7. 7A monoatomic ideal gas, initially at temperature , is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand10 May, 2025 (S2)Thermodynamic Processes
  8. 8An ideal gas is expanding such that constant. The coefficient of volume expansion of the gas is10 May, 2025 (S2)Thermodynamic Processes
  9. 9The heat required to increase the temperature of 4 moles of a mono-atomic ideal gas from to at constant volume is10 May, 2025 (S2)Thermodynamic Processes
  10. 10A given volume of gas at NTP is allowed to expand 6 times of its original volume, first under isothermal condition and then under adiabatic 10 May, 2025 (S3)Thermodynamic Processes
  11. 11A thermodynamic system changes its state from A to C in two different paths ABC and AC. The internal energy of the system at state C is and 2024 (Afternoon Shift)Thermodynamic Processes
  12. 12A cylinder of fixed capacity 44.81 contains hydrogen gas at STP. What is the amount of heat needed to raise the temperature of the gas in th2024 (Evening Shift)First Law of Thermodynamics
  13. 13The latent heat of vaporisation of water is . If the work done in the process of vaporisation of is , the increase in internal energy is2024 (Evening Shift)First Law of Thermodynamics
  14. 14The molar heat capacity in a process of a diatomic gas if it does a work of , when a heat of is supplied to it is2024 (Memory Based)First Law of Thermodynamics
  15. 15A thermally insulated rigid container contains an ideal gas heated by a filament of resistance through a current of 1 A for 5 min , then cha2024 (Memory Based)First Law of Thermodynamics
  16. 16In an adiabatic expansion of air, the volume is increased by . The percentage change in pressure is2023 (Evening Shift)Thermodynamic Processes
  17. 17If the ratio of specific heat of a gas at constant pressure to that at constant volume is , the change in internal energy of a mass of a gas2023 (Evening Shift)First Law of Thermodynamics
  18. 18A gas is taken through the cycle , as shown in figure. What is the net work done by the gas?2023 (Memory Based)First Law of Thermodynamics
  19. 19An ideal gas goes from state to state via three different processes as indicated in the diagram. If and indicate the heat absorbed by the th2023 (Memory Based)Thermodynamic Processes
  20. 20If of heat is added to a system and the work done by the system is , then change in internal energy will be2023 (Memory Based)First Law of Thermodynamics
  21. 21A gas is taken through the cycle , as shown in figure. What is the net work done by the gas?2023 (Morning Shift)First Law of Thermodynamics
  22. 22If of heat is added to a system and the work done by the system is , then change in internal energy will be2023 (Morning Shift)First Law of Thermodynamics
  23. 23An ideal gas goes from state to state via three different processes as indicated in the - diagram. If and indicate the heat absorbed by the 2023 (Morning Shift)First Law of Thermodynamics
  24. 24If a Carnot heat engine has a sink at a temperature of and takes of heat from a source at a temperature of , the work done (in J) is:2022Heat Engine, Refrigerator and Second Law of Thermodynamics
  25. 25From the following -V diagram, an ideal gas undergoing a change of state from to . Four different processes I, II, III and IV as shown in th2022First Law of Thermodynamics
  26. 26An ideal gas is taken through the cycle , as shown in the figure (assume Volume is in ). If the net heat supplied to the gas in the cycle is2022First Law of Thermodynamics
  27. 27There are two identical containers and containing to identical gases. Gas in is reduced to half of its original volume adiabatically, while 2022Thermodynamic Processes
  28. 28In an adiabatic process with the ratio of two specific heat, , pressure is increased by , then decrease in the volume will be2021Thermodynamic Processes
  29. 29For an ideal gas, coefficient of volume expansion is given by2021Thermodynamic Systems
  30. 30Carnot cycle of an engine is given below Total work done by the gas in one cycle is2021Heat Engine, Refrigerator and Second Law of Thermodynamics
  31. 31of a gas is compressed at 1 atmospheric pressure and temperature to . What is the final pressure under adiabatic condition? for the gas )2020Thermodynamic Processes
  32. 32If is at a temperature of and source at , then efficiency will be2020Heat Engine, Refrigerator and Second Law of Thermodynamics
  33. 33An ideal gas heat engine operates in a Carnot's cycle between and . It absorbs J at high temperature. The amount of heat converted into work2019Heat Engine, Refrigerator and Second Law of Thermodynamics
  34. 34Blowing air with open mouth is an example of2019Thermodynamic Processes
  35. 35An ideal gas is taken via path as shown in figure. The network done in the whole cycle is2018First Law of Thermodynamics
  36. 36In which of the processes, does the internal energy of the system remain constant?2018Thermodynamic Systems
  37. 37An ideal monoatomic gas is taken around the cycle as shown in the diagram. The work done during the cycle is given by2017First Law of Thermodynamics
  38. 38In an adiabatic process,2016Thermodynamic Processes
  39. 39Carnot heat engine takes of heat from a source at and gives some part of it to at . Work done by engine in one cycle is2016Heat Engine, Refrigerator and Second Law of Thermodynamics
  40. 40In an isochoric process2015Thermodynamic Processes
  41. 41The universal gas law constant is applicable to2014Thermodynamic Processes
  42. 42Which of the following relations does not give the equation of an adiabatic process, where terms have their usual meaning?2013Thermodynamic Processes
  43. 43Blowing air with open mouth is an example of2013Thermodynamic Processes
  44. 44An ideal gas heat engine operates in a Carnot's cycle between and . It absorbs at high temperature. The amount of heat converted into work i2013Heat Engine, Refrigerator and Second Law of Thermodynamics
  45. 45The work done in taking an ideal gas through one cycle of operation as shown in the indicator diagram below2012First Law of Thermodynamics

Frequently Asked Questions

1.How many questions are available for Thermodynamics?

This chapter includes 45 questions compiled from COMEDK papers spanning 2012 to 2026.

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

These are COMEDK questions specifically for the Thermodynamics chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Thermodynamics an important chapter for COMEDK Physics?

Thermodynamics has appeared in 15 of the 15 years of COMEDK papers covered here, with 45 questions across 23 papers - about 2 per paper it appears in.

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

Of the 45 questions analysed for this chapter, 49% are easy, 44% moderate and 7% tough. 2023 had the most, with 8 questions.

5.Which topics in Thermodynamics should I focus on?

These topics have carried the most weightage in Thermodynamics:

  • Thermodynamic Processes - 19 questions (42%)
  • First Law of Thermodynamics - 17 questions (38%)
  • Heat Engine, Refrigerator and Second Law of Thermodynamics - 6 questions (13%)
  • Heat Engine, Refrigerator and Second Law of Thermodynamics has produced the most tough questions (2).
6.Is Thermodynamics's weightage in COMEDK going up or down?

Across all 23 papers analysed, Thermodynamics has averaged about 2.0 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.