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Friday, 9 October

JEE Main Physics · Class 11

Thermodynamics: JEE Main previous year questions

Thermodynamics had 48 questions in the 42 JEE Main shifts Lumi analysed, about 1.0 a shift, asked in 37 of 42 shifts. It ranks 7 of 29 Physics chapters by questions; 8% of its questions were hard.

Questions
48
in 37 of 42 shifts
A shift, on average
1.0
of 25 Physics questions
Since 2024
+0.2
0.9 a shift in 2017–23, 1.1 in 2024–26
Numerical answer
9
19% of its questions

Year by year

How often it came

Questions in the analysed shifts of each year. Years differ in how many shifts Lumi analysed, so read the bars with the shift count.

Questions each year
06121’174’205’215’224’238’2411’2510’26

2017: 1 shifts · 2020: 4 shifts · 2021: 4 shifts · 2022: 4 shifts · 2023: 4 shifts · 2024: 8 shifts · 2025: 8 shifts · 2026: 9 shifts

Difficulty by year
  • 20171
  • 20204
  • 20215
  • 20225
  • 20234
  • 20248
  • 202511
  • 202610
  • Easy
  • Medium
  • Hard

Inside the chapter

Topics and the ideas that repeat

5 topics and 27 distinct ideas; 12 ideas were asked more than once. Most questions are single correct and multi-step.

Topics, by questions

1 questions had no close topic in our taxonomy and are counted for the chapter only.

Ideas asked most
12 repeat

Study it on Lumi

Thermodynamics: the interactive lesson

Every question

All 48 Thermodynamics questions

Newest first. Each opens with its options and the official answer.

2026 10 questions

  1. 2 Apr 2026, Shift 1 · Q33Heat is supplied to a diatomic gas at constant pressure. Then the ratio of ΔQ:ΔU:ΔW\Delta Q : \Delta U : \Delta W is ______.EasySingle correct
  2. 2 Apr 2026, Shift 1 · Q47A vessel contains 0.15 m30.15\ \mathrm{m^3} of a gas at pressure 88 bar and temperature 140 ∘140\ ^\circC with cp=3Rc_p=3R and cv=2Rc_v=2R. It is…MediumNumerical value
  3. 2 Apr 2026, Shift 2 · Q485 moles of unknown gas is heated at constant volume from 10°C to 20°C. The molar specific heat of this gas at constant pressure cp=8c_p = 8…MediumNumerical value
  4. 5 Apr 2026, Shift 1 · Q32Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Statement I: Change in internal…MediumTwo statements
  5. 5 Apr 2026, Shift 1 · Q33Consider the following statements: A. Zeroth law of thermodynamics gives concept of temperature B. First law of thermodynamics gives…MediumOther
  6. 6 Apr 2026, Shift 1 · Q50A certain gas is isothermally compressed to (13)rd\left(\frac{1}{3}\right)^{\mathrm{rd}} of its initial volume (V0=3V_0=3 litre) by applying…MediumNumerical value
  7. 6 Apr 2026, Shift 2 · Q30A cylinder with adiabatic walls is closed at both ends and is divided into two compartments by a frictionless adiabatic piston. Ideal gas…HardSingle correct
  8. 6 Apr 2026, Shift 2 · Q35If 2 mole of an ideal monoatomic gas at temperature TT, is mixed with 6 mole of another ideal monoatomic gas at temperature 2T2T then the…EasySingle correct
  9. 8 Apr 2026, Shift 2 · Q35One mole of diatomic gas having rotational modes only is kept in a cylinder with a piston system. The cross-section area of the cylinder…MediumSingle correct
  10. 8 Apr 2026, Shift 2 · Q36Initial pressure and volume of a monoatomic ideal gas are PP and VV. The change in internal energy of this gas in adiabatic expansion to…MediumSingle correct

2025 11 questions

  1. 2 Apr 2025, Shift 1 · Q31In an adiabatic process, which of the following statements is true ?EasySingle correct
  2. 2 Apr 2025, Shift 2 · Q32Identify the characteristics of an adiabatic process in a monoatomic gas. (A) Internal energy is constant. (B) Work done in the process is…MediumOther
  3. 3 Apr 2025, Shift 1 · Q33During the melting of a slab of ice at 273 K at atmospheric pressure:MediumSingle correct
  4. 3 Apr 2025, Shift 1 · Q34A gas is kept in a container having walls which are thermally non-conducting. Initially the gas has a volume of 800 cm3800\ \mathrm{cm^3} and…EasySingle correct
  5. 3 Apr 2025, Shift 1 · Q35A piston of mass M is hung from a massless spring whose restoring force law goes as F=−kx3F = -kx^3, where k is the spring constant of…HardDiagram basedHas a figure
  6. 3 Apr 2025, Shift 2 · Q33An ideal gas exists in a state with pressure P0\mathrm{P_0}, volume V0\mathrm{V_0}. It is isothermally expanded to 4 times of its initial…MediumSingle correct
  7. 4 Apr 2025, Shift 2 · Q33Match List - I with List - II. List - I List - II (A) Isobaric (I) ΔQ=ΔW\Delta Q=\Delta W (B) Isochoric (II) ΔQ=ΔU\Delta Q=\Delta U (C)…EasyMatch the list
  8. 7 Apr 2025, Shift 1 · Q33Match the LIST-I with LIST-I LIST-I | LIST-II A. Triatomic rigid gas | I. CpCv=53\frac{C_p}{C_v} = \frac{5}{3} B. Diatomic non-rigid gas | II.…MediumMatch the list
  9. 7 Apr 2025, Shift 1 · Q48An ideal gas has undergone through the cyclic process as shown in the figure. Work done by the gas in the entire cycle is _______…MediumNumerical valueHas a figure
  10. 7 Apr 2025, Shift 2 · Q34Match List - I with List - II. List - I | List - II (A) Isothermal | (I) ΔW\Delta W (work done) =0=0 (B) Adiabatic | (II) ΔQ\Delta Q…EasyMatch the list
  11. 8 Apr 2025, Shift 2 · Q33A monoatomic gas having γ=53\gamma = \frac{5}{3} is stored in a thermally insulated container and the gas is suddenly compressed to…EasySingle correct

2024 8 questions

  1. 6 Apr 2024, Shift 2 · Q39A total of 48 J heat is given to one mole of helium kept in a cylinder. The temperature of helium increases by 2∘C2^\circ\mathrm{C}. The…EasySingle correct
  2. 8 Apr 2024, Shift 1 · Q37Two different adiabatic paths for the same gas intersect two isothermal curves as shown in P-V diagram. The relation between the ratio…MediumSingle correctHas a figure
  3. 9 Apr 2024, Shift 1 · Q38A sample of 11 mole gas at temperature T is adiabatically expanded to double its volume. If adiabatic constant for the gas is…MediumSingle correct
  4. 9 Apr 2024, Shift 1 · Q39The volume of an ideal gas (γ=1.5\gamma=1.5) is changed adiabatically from 55 litres to 44 litres. The ratio of initial pressure to final…EasySingle correct
  5. 9 Apr 2024, Shift 2 · Q36A real gas within a closed chamber at 27∘C27^\circ C undergoes the cyclic process as shown in figure. The gas obeys PV3=RTPV^3=RT equation for…HardSingle correctHas a figure
  6. 30 Jan 2024, Shift 2 · Q38Choose the correct statement for processes AA & BB shown in figure.MediumSingle correctHas a figure
  7. 30 Jan 2024, Shift 2 · Q39If three moles of monoatomic gas (γ=53)\left(\gamma = \frac{5}{3}\right) is mixed with two moles of a diatomic gas…MediumSingle correct
  8. 31 Jan 2024, Shift 2 · Q39A gas mixture consists of 8 moles of argon and 6 moles of oxygen at temperature T. Neglecting all vibrational modes, the total internal…EasySingle correct

2023 4 questions

  1. 6 Apr 2023, Shift 1 · Q44A 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…EasySingle correct
  2. 8 Apr 2023, Shift 2 · Q34Work done by a Carnot engine operating between temperatures 127∘127^\circC and 27∘27^\circC is 2 kJ. The amount of heat transferred to the…EasySingle correct
  3. 11 Apr 2023, Shift 1 · Q441 kg of water at 100∘100^\circC is converted into steam at 100∘100^\circC by boiling at atmospheric pressure. The volume of water changes from…MediumSingle correct
  4. 13 Apr 2023, Shift 2 · Q38The initial pressure and volume of an ideal gas are P0P_0 and V0V_0. The final pressure of the gas when the gas is suddenly compressed to…EasySingle correct

2022 5 questions

  1. 25 Jul 2022, Shift 1 · Q37A certain amount of gas of volume VV at 27∘27^\circC temperature and pressure 2×107 Nm−22\times10^{7}\ \mathrm{Nm^{-2}} expands isothermally until…MediumSingle correct
  2. 28 Jul 2022, Shift 1 · Q37A Carnot engine has efficiency of 50%. If the temperature of sink is reduced by 40∘40^\circC, its efficiency increases by 30%. The…MediumSingle correct
  3. 24 Jun 2022, Shift 1 · Q47A Carnot engine whose heat sinks at 27∘27^\circC, has an efficiency of 25%. By how many degrees should the temperature of the source be…MediumSingle correct
  4. 29 Jun 2022, Shift 1 · Q35A cylinder of fixed capacity of 44.8 litres contains helium gas at standard temperature and pressure. The amount of heat needed to raise…EasySingle correct
  5. 29 Jun 2022, Shift 1 · Q56300 cal. of heat is given to a heat engine and it rejects 225 cal. of heat. If source temperature is 227∘C227^\circ\mathrm{C}, then the…EasyNumerical value

2021 5 questions

  1. 3 Aug 2021, Shift 2 · Q3One mole Argon gas is sealed inside a thermally isolated chamber of 1 litre. A 100 W heater kept inside the chamber is switched on for 30…MediumSingle correct
  2. 25 Jul 2021, Shift 1 · Q13For a gas CP−CV=RC_P-C_V=R in a state P and CP−CV=1.10 RC_P-C_V=1.10\,R in a state Q, TPT_P and TQT_Q are the temperatures in two different states P and…HardSingle correct
  3. 25 Jul 2021, Shift 1 · Q20A monoatomic ideal gas, initially at temperature T1T_1 is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to…EasySingle correct
  4. 16 Mar 2021, Shift 2 · Q26For an ideal heat engine, the temperature of the source is 127∘127^\circC. In order to have 60% efficiency the temperature of the sink…EasyNumerical value
  5. 18 Mar 2021, Shift 1 · Q4The P-V diagram of a diatomic ideal gas system going under cyclic process as shown in figure. The work done during an adiabatic process CD…MediumSingle correctHas a figure

2020 4 questions

  1. 8 Jan 2020, Shift 1 · Q8A thermodynamic cycle xyzxxyzx is shown on a V-T diagram. The P-V diagram that best describes this cycle is : (Diagrams are schematic and…MediumDiagram basedHas a figure
  2. 9 Jan 2020, Shift 2 · Q21Starting at temperature 300 K, one mole of an ideal diatomic gas (γ=1.4\gamma = 1.4) is first compressed adiabatically from volume V1V_1 to…MediumNumerical value
  3. 2 Sep 2020, Shift 1 · Q22An engine takes in 5 moles of air at 20∘20^\circC and 1 atm, and compresses it adiabaticaly to 1/10th1/10^{\mathrm{th}} of the original volume.…MediumNumerical value
  4. 6 Sep 2020, Shift 2 · Q22An engine operates by taking a monatomic ideal gas through the cycle shown in the figure. The percentage efficiency of the engine is close…MediumNumerical valueHas a figure

2017 1 questions

  1. 2 Apr 2017 (offline) · Q10CpC_p and CvC_v are specific heats at constant pressure and constant volume respectively. It is observed that Cp−Cv=aC_p - C_v = a for hydrogen…EasySingle correct

Pattern: Asked most years.