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Physics - Thermodynamics

Practise 32 BITSAT previous year questions on Thermodynamics, compiled from papers spanning 2009 to 2024. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty BITSAT tests.

Thermodynamics has been asked in 13 of the 16 years of BITSAT papers analysed (2009–2024), with 32 questions in all. 44% of them were easy, 38% moderate and 19% tough. Most of its questions came from 2024, with 4 questions that year. In the last three years (2022–2024) it had 6 questions across 5 papers, about 1.2 per paper.

The chapter's 4 topics are not weighted equally: Thermodynamic Processes (20 questions, 63%), First Law of Thermodynamics (6 questions, 19%), and Heat Engine, Refrigerator and Second Law of Thermodynamics (3 questions, 9%) have been asked the most. Thermodynamic Processes has also led over the last five years, with 5 questions. First Law of Thermodynamics has produced the most tough questions (2).

  1. 1A source supplies heat to a system at the rate of 1000 W . If the system performs work at a rate of 200 W . The rate at which internal energ2024 (Memory Based Paper 1)First Law of Thermodynamics
  2. 2On celcius scale the temperature of body increases by . The increase in temperature on Fahrenheit scale is:2024 (Memory Based Paper 1)Thermodynamic Systems
  3. 3A gas can be taken from A to B via two different processes and . When path is used 60 J of heat flows into the system and 30J of work is don2024 (Memory Based Paper 2)First Law of Thermodynamics
  4. 4In the given cycle , the heat required for an ideal monoatomic gas will be2024 (Memory Based Paper 3)Thermodynamic Processes
  5. 5A thermodynamic system is taken through cyclic process. The total work done in the process is :2023 (Memory Based Paper 1)Thermodynamic Processes
  6. 6A hypothetical gas expands adiabatically such that its volume changes from 08 litres to 27 litres. If the ratio of final pressure of the gas2023 (Memory Based Paper 2)Thermodynamic Processes
  7. 7An ideal gas at atmospheric pressure is adiabatically compressed so that its density becomes 32 times of its initial value. If the final pre2021Thermodynamic Processes
  8. 8The compressibility of water is per unit atmospheric pressure. The decrease in volume of of water under a pressure of 100 atmosphere will be2021Thermodynamic Systems
  9. 9In an adiabatic process, the pressure is increased by If then the volume decreases by nearly2020Thermodynamic Processes
  10. 10An ideal monoatomic gas at 300 K expands adiabatically to twice its volume. The final temperature of gas is2019Thermodynamic Processes
  11. 11The pressure versus temperature graph of an ideal gas is shown in the figure below. If the density of gas at point A is 0 , then the density2019Thermodynamic Processes
  12. 12The figure shows the graph of p V T versus p for 2 10 - 4 kg of hydrogen gas at two different temperatures, where p , V and T represents pre2019Thermodynamic Processes
  13. 13A reservoir is at 827 C and Carnot s engine takes a thousand kilo calorie of heat from it and exhausts it to a sink at 27 C . What is the am2018Heat Engine, Refrigerator and Second Law of Thermodynamics
  14. 14Helium gas goes through a cycle A B C D A (consisting of two isochoric and two isobaric lines) as shown in figure. The efficiency of this cy2018Thermodynamic Processes
  15. 15Figure below shows two paths that may be taken by a gas to go from a state to a state In process of heat is added to the system and in proce2016Thermodynamic Processes
  16. 16A vessel of volume 20L contains a mixture of hydrogen and helium at temperature of and pressure 2 atm. The mass of mixture is . Assuming the2015Thermodynamic Processes
  17. 17One mole of gas having a volume equal to 22.4 Litres at and 1 atmospheric pressure in compressed isothermally so that its volume reduces to 2014Thermodynamic Processes
  18. 18In a thermodynamic process, the pressure of a fixed mass of a gas is changed in such a manner that the gas releases of heat and of work is d2014First Law of Thermodynamics
  19. 19Two balloons are filled one with pure he gas and other with air respectively. If the pressure and temperature of these balloons are same, th2014Thermodynamic Processes
  20. 20A thermodynamical system is changed from state to by two different process, the quantity which will remain same will be2013First Law of Thermodynamics
  21. 21A Carnot's heat engine works between the temperatures and . What amount of heat should it consume per second to deliver mechanical work at t2013Heat Engine, Refrigerator and Second Law of Thermodynamics
  22. 22A vessel containing 1 more of gas (molar mass 32) at temperature . The pressure of the gas is p. An identical vessel containing one mole of 2013Thermodynamic Processes
  23. 23Two gases occupy two containers and the gas in of volume exerts a pressure of and that in of volume exerts a pressure . The two containers a2013Thermodynamic Processes
  24. 24A solid body of constant heat capacity is being heated by keeping it in contact with reservoirs in two ways: (i) Sequentially keeping in con2012Thermodynamic Systems
  25. 25Which of the following process is possible according to the first law of thermodynamics?2012First Law of Thermodynamics
  26. 26For an isothermal expansion of a perfect gas, the value of is equal to2012Thermodynamic Processes
  27. 27A sample of ideal monoatomic gas is taken round the cycle ABCA as shown in the figure. The work done during the cycle is2012Thermodynamic Processes
  28. 28In the equation constant, the value of is unity. Then the process is2010Thermodynamic Processes
  29. 29An ideal refrigerator has a freezer at a temperature of . The coefficient of performance of the engine is The temperature of the air (to whi2010Heat Engine, Refrigerator and Second Law of Thermodynamics
  30. 30A sample of gas expands from volume to . The amount of work done by the gas is greatest when the expansion is2009First Law of Thermodynamics
  31. 31A cyclic process is shown in the p-T diagram. Which of the curves show the same process on a - diagram?2009Thermodynamic Processes
  32. 32Which one the following graphs represents the behaviour of an ideal gas2009Thermodynamic Processes

Frequently Asked Questions

1.How many questions are available for Thermodynamics?

This chapter includes 32 questions compiled from BITSAT papers spanning 2009 to 2024.

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

These are BITSAT 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 BITSAT Physics?

Thermodynamics has appeared in 13 of the 16 years of BITSAT papers covered here, with 32 questions across 16 papers - about 2 per paper it appears in.

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

Of the 32 questions analysed for this chapter, 44% are easy, 38% moderate and 19% tough. 2024 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 - 20 questions (63%)
  • First Law of Thermodynamics - 6 questions (19%)
  • Heat Engine, Refrigerator and Second Law of Thermodynamics - 3 questions (9%)
  • First Law of Thermodynamics has produced the most tough questions (2).
6.Is Thermodynamics's weightage in BITSAT going up or down?

Across all 16 papers analysed, Thermodynamics has averaged about 2.0 questions per paper. In the last three years (2022–2024), that average has fallen, at about 1.2 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.