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Physics - Thermodynamics

Practise 28 KCET previous year questions on Thermodynamics, compiled from papers spanning 2007 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 KCET tests.

Thermodynamics has been asked in 19 of the 20 years of KCET papers analysed (2007–2026), with 28 questions in all. 68% of them were easy, 25% moderate and 7% tough. Most of its questions came from 2008, with 3 questions that year. In the last three years (2024–2026) it had 4 questions across 3 papers, about 1.3 per paper.

The chapter's 5 topics are not weighted equally: Heat Engine, Refrigerator and Second Law of Thermodynamics (11 questions, 39%), Thermodynamic Processes (10 questions, 36%), and First Law of Thermodynamics (4 questions, 14%) have been asked the most. Over the last five years the most frequent topics have been Thermodynamic Processes (2), Heat Engine, Refrigerator and Second Law of Thermodynamics (2), and First Law of Thermodynamics (1). Heat Engine, Refrigerator and Second Law of Thermodynamics has produced the most tough questions (1).

  1. 1In thermodynamic processes, which of the following statements is not true?2026Thermodynamic Processes
  2. 2Following are statements of a few processes taking place in nature. I. Free expansion of a gas II. The combustion of a mixture of petrol and2026Heat Engine, Refrigerator andSecond Law of Thermodynamics
  3. 3A gas is taken from state A to state B along two different paths 1 and 2. The heat absorbed and work done by the system along these two path2025First Law of Thermodynamics
  4. 4One mole of an ideal monoatomic gas is taken round the cyclic process MNOM. The work done by the gas is2024Thermodynamic Processes
  5. 5The diagram of a Carnot's engine is shown in the graph below. The engine uses 1 mole of an ideal gas as working substance. From the graph, t2023Heat Engine, Refrigerator and Second Law of Thermodynamics
  6. 6"Heat cannot be flow itself from a body at lower temperature to a body at higher temperature". This statement corresponds to2022Heat Engine, Refrigerator and Second Law of Thermodynamics
  7. 7A number of Carnot engines are operated at identical cold reservoir temperatures . However, their hot reservoir temperatures are kept differ2021Heat Engine, Refrigerator and Second Law of Thermodynamics
  8. 8A gas mixture contains monoatomic and diatomic molecules of 2 moles each. The mixture has a total internal energy of (symbols have usual mea2021First Law of Thermodynamics
  9. 9In an adiabatic expansion of an ideal gas the product of pressure and volume2020Thermodynamic Processes
  10. 10A certain amount of heat energy is supplied to a monoatomic ideal gas which expands at constant pressure. What fraction of the heat energy i2020First Law of Thermodynamics
  11. 11A thermodynamic system undergoes a cyclic process \( A B C \) as shown in the diagram. The work done by the system per cycle is2019Thermodynamic Processes
  12. 12A carnot engine takes \( 300 \) calories of heat from a source at \( 500 {~K} \) and rejects \( 150 \) calories of heat to the sink. The tem2018Heat Engine, Refrigerator and Second Law of Thermodynamics
  13. 13Three point charges of \( +2 q,+2 q \) and \( -4 q \) are placed at the corners \( A, B \) and \( C \) of an equilateral triangle \( {ABC} \2017Heat Engine, Refrigerator and Second Law of Thermodynamics
  14. 14A Carnot engine working between \( 300 {~K} \) and \( 400 {~K} \) has \( 800 {~J} \) of useful work. The amount of heat energy supplied to t2016Heat Engine, Refrigerator and Second Law of Thermodynamics
  15. 15The angle between the dipole moment and electric field at any point on the equatorial plane is2015Heat Engine, Refrigerator and Second Law of Thermodynamics
  16. 16A stone is thrown vertically at a speed of \( 30 {~ms}^{-1} \) making an angle of \( 45^{ } \) with the horizontal. What is the maximum heig2014Heat Engine, Refrigerator and Second Law of Thermodynamics
  17. 17A pipe of \( 30 {~cm} \) long and open at both the ends produces harmonics. Which harmonic mode of pipe resonates a \( 1.1 {kHz} \) source ?2014Thermodynamic Processes
  18. 18For which combination of working temperatures of source and sink, the efficiency of Carnot's heat engine is maximum?2013Heat Engine, Refrigerator and Second Law of Thermodynamics
  19. 19One mole of an ideal gas is taken from A to B, from to and then back to . The variation of its volume with temperature for that change is as2012First Law of Thermodynamics
  20. 20The efficiency of Carnot's heat engine is when the temperature of the source is and that of is . The efficiency of another Carnot's heat eng2010Heat Engine, Refrigerator and Second Law of Thermodynamics
  21. 21Which of the following is not a thermodynamic coordinate?2009Thermodynamic Systems
  22. 22A graph of pressure versus volume for an ideal gas for different processes is as shown. In the graph curve represents2009Thermodynamic Processes
  23. 23If is the ratio of specific heats and is the universal gas constant, then the molar specific heat at constant volume is given by2008Thermodynamic Systems
  24. 24An ideal gas is taken path as shown in figure. The net work done in the whole cycle is2008Thermodynamic Processes
  25. 25In which of the processes, does the internal energy of the system remain constant?2008Thermodynamic Processes
  26. 26During an adiabatic process, the cube of the pressure is found to be inversely proportional to the fourth power of the volume. Then the rati2007Thermodynamic Processes
  27. 27of heat is required to raise the temperature of 2 moles of an ideal gas at constant pressure from to . The amount of heat required to raise 2007Thermodynamic Processes
  28. 28A Carnot's engine operates with source at and sink at . If the source supplies of heat energy, the work done by the engine is2007Heat Engine, Refrigerator and Second Law of Thermodynamics

Frequently Asked Questions

1.How many questions are available for Thermodynamics?

This chapter includes 28 questions compiled from KCET papers spanning 2007 to 2026.

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

These are KCET 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 KCET Physics?

Thermodynamics has appeared in 19 of the 20 years of KCET papers covered here, with 28 questions across 19 papers - about one per paper it appears in.

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

Of the 28 questions analysed for this chapter, 68% are easy, 25% moderate and 7% tough. 2008 had the most, with 3 questions.

5.Which topics in Thermodynamics should I focus on?

These topics have carried the most weightage in Thermodynamics:

  • Heat Engine, Refrigerator and Second Law of Thermodynamics - 11 questions (39%)
  • Thermodynamic Processes - 10 questions (36%)
  • First Law of Thermodynamics - 4 questions (14%)
  • Heat Engine, Refrigerator and Second Law of Thermodynamics has produced the most tough questions (1).
6.Is Thermodynamics's weightage in KCET going up or down?

Across all 19 papers analysed, Thermodynamics has averaged about 1.5 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.