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Physics - Thermodynamics

Practise 25 WBJEE previous year questions on Thermodynamics, compiled from papers spanning 2011 to 2025. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.

Thermodynamics has been asked in 13 of the 18 years of WBJEE papers analysed (2009–2026), with 25 questions in all. 36% of them were easy, 40% moderate and 24% tough. Most of its questions came from 2022, with 4 questions that year. In the last three years (2024–2026) it had 1 question across 3 papers, about 0.3 per paper.

The chapter's 4 topics are not weighted equally: Thermodynamic Processes (13 questions, 52%), First Law of Thermodynamics (9 questions, 36%), and Thermodynamic Systems (2 questions, 8%) have been asked the most. Thermodynamic Processes has also led over the last five years, with 4 questions. Thermodynamic Processes has produced the most tough questions (4).

  1. 1For an ideal gas, a cyclic process ABCA as shown in diagram, when presented in plot, it would be2025Thermodynamic Processes
  2. 2Two substance \(A\) and \(B\) of same mass are heated at constant rate. The variation of temperature \( \) of the substance with time \( {t}2023Heat Engine, Refrigerator and Second Law of Thermodynamics
  3. 3A given quantity of gas is taken from \(A\) to \(C\) in two ways; \(a\) ) directly from \(A C\) along a straight line and \(b\) ) in two ste2023First Law of Thermodynamics
  4. 4A cyclic process is shown in \( {p}- {v}\) diagram and \( {T}- {S}\) diagram. Which of the following statement(s) is/are true?2023Thermodynamic Processes
  5. 5Consider a thermodynamic process where internal energy constant). If the process is performed adiabatically, then2022First Law of Thermodynamics
  6. 6One mole of a diatomic ideal gas undergoes a process shown in diagram. The total heat given to the gas is2022Thermodynamic Processes
  7. 7Certain amount of an ideal gas is taken from its initial state 1 to final state 4 through the paths as shown in figure. are all isotherms. I2022First Law of Thermodynamics
  8. 8One mole of an ideal monoatomic gas expands along the polytrope constant from to at a constant pressure . The temperature during the process2022Thermodynamic Processes
  9. 9In the given figure, 1 represents isobaric, 2 represents isothermal and 3 represents adiabatic processes of an ideal gas. If be the changes 2021Thermodynamic Processes
  10. 10Consider the P-V diagram for 1 mole of an ideal monatomic gas shown in the figure. Which of the following statements is/are true?2021First Law of Thermodynamics
  11. 11An ideal gas undergoes the cyclic process abca as shown in the given diagram. It rejects of heat during and absorbs of heat during ca. Durin2020Thermodynamic Processes
  12. 12A container in the shape of a rectangular parallelopiped of length is divided internally by a movable partition as shown in the figure. The 2020Thermodynamic Systems
  13. 13Consider the given diagram. An ideal gas is contained in a chamber (left) of volume and is at an absolute temperature . It is allowed to rus2019Thermodynamic Systems
  14. 14The initial pressure and volume of a given mass of an ideal gas with taken in a cylinder fitted with a piston, are and respectively. At this2019Thermodynamic Processes
  15. 15For an ideal gas with initial pressure and volume and respectively, a reversible isothermal expansion happens, when its volume becomes . The2018Thermodynamic Processes
  16. 16Which of the following statements(s) is/are true? "Internal energy of an ideal gas ..........."2018Thermodynamic Processes
  17. 172 moles of an ideal monoatomic gas is carried from a state to state along a straight line path in a diagram. The amount of heat absorbed by 2017First Law of Thermodynamics
  18. 18The perfect gas equation for of hydrogen gas is2016Thermodynamic Processes
  19. 19The pressure , volume and temperature for a certain gas are related by where and are constants. The work done by the gas when the temperatur2015First Law of Thermodynamics
  20. 20One mole of an ideal monoatomic gas is heated at a constant pressure from to . Then the change in the internal enery of the gas is (Given, )2014Thermodynamic Processes
  21. 21One mole of a van der Waals' gas obeying the equation undergoes the quasi-static cyclic process which is shown in the diagram. The net heat 2014First Law of Thermodynamics
  22. 22heating element of resistance is fitted inside an adiabatic cylinder which carries a frictionless piston of mass and cross section A as show2014Thermodynamic Processes
  23. 23A frictionless piston-cylinder based enclosure contains some amount of gas at a pressure of . Then heat is transferred fo the gas at constan2013First Law of Thermodynamics
  24. 24An ideal mono-atomic gas of given mass is heated at constant pressure. In this process, the fraction of supplied heat energy used for the in2013First Law of Thermodynamics
  25. 25An ideal gas is compressed isothermally until its pressure is doubled and then allowed to expand adiabatically to regain its original volume2011Thermodynamic Processes

Frequently Asked Questions

1.How many questions are available for Thermodynamics?

This chapter includes 25 questions compiled from WBJEE papers spanning 2011 to 2025.

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

These are WBJEE 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 WBJEE Physics?

Thermodynamics has appeared in 13 of the 18 years of WBJEE papers covered here, with 25 questions across 13 papers - about 2 per paper it appears in.

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

Of the 25 questions analysed for this chapter, 36% are easy, 40% moderate and 24% tough. 2022 had the most, with 4 questions.

5.Which topics in Thermodynamics should I focus on?

These topics have carried the most weightage in Thermodynamics:

  • Thermodynamic Processes - 13 questions (52%)
  • First Law of Thermodynamics - 9 questions (36%)
  • Thermodynamic Systems - 2 questions (8%)
  • Thermodynamic Processes has produced the most tough questions (4).
6.Is Thermodynamics's weightage in WBJEE going up or down?

Across all 13 papers analysed, Thermodynamics has averaged about 1.9 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.