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Physics - Thermodynamics

Practise 46 AIIMS previous year questions on Thermodynamics, compiled from papers spanning 2001 to 2019. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty AIIMS tests.

Thermodynamics has been asked in 19 of the 19 years of AIIMS papers analysed (2001–2019), with 46 questions in all. 61% of them were easy, 20% moderate and 20% tough. Most of its questions came from 2019, with 8 questions that year. In the last three years (2017–2019) it had 12 questions across 5 papers, about 2.4 per paper.

The chapter's 4 topics are not weighted equally: Thermodynamic Processes (24 questions, 52%), Heat Engine, Refrigerator and Second Law of Thermodynamics (13 questions, 28%), and First Law of Thermodynamics (5 questions, 11%) have been asked the most. Thermodynamic Processes has produced the most tough questions (4).

  1. 1Which of the following diagrams, best represents an isothermal process?26 May, 2019Thermodynamic Processes
  2. 2A conducting and closed container of capacity 100 litre contains an ideal gas at a high pressure. Now using a pump, the gas is taken out at 26 May, 2019Thermodynamic Processes
  3. 3Helium gas goes through a cycle (consisting of two isochoric and two isobaric lines) as shown in figure. Efficiency of this cycle is nearly 26 May, 2019Thermodynamic Processes
  4. 4Assertion : Co-efficient of performance of a refrigerator always greater than one. Reason : In a refrigerator, heat is extracted from lower 26 May, 2019Heat Engine, Refrigerator and Second Law of Thermodynamics
  5. 5Assertion : During rapid pumping of air in tyres, air inside the tyre is hotter than atmosphere air. Reason : Adiabatic process occurs at ve26 May, 2019Thermodynamic Processes
  6. 6In an isobaric process, the work done by a diatomic gas is , the heat given to the gas will be25 May, 2019Thermodynamic Processes
  7. 7For a refrigerator, heat absorbed from source is and heat supplied to sink is . Then find the coefficient of performance25 May, 2019Heat Engine, Refrigerator and Second Law of Thermodynamics
  8. 8Assertion : Pressure versus 1/volume graph is straight line for adiabatic process. Reason : constant for adiabatic process.25 May, 2019Thermodynamic Processes
  9. 9Assertion : In adiabatic process change in internal energy is equal to work done on gas. Reason: In adiabatic process no heat exchange with 27 May, 2018Thermodynamic Processes
  10. 10A diatomic gas which has initial volume of 10 litre is isothermally compressed to of its original volume where initial pressure is . If temp26 May, 2018Thermodynamic Processes
  11. 11When an ideal monoatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of2017First Law of Thermodynamics
  12. 12A Carnot engine operates with source at and sink at . If the source supplies of heat energy, the work done by the engine is2017Heat Engine, Refrigerator and Second Law of Thermodynamics
  13. 13Assertion : In an adiabatic process, change in internal energy of a gas is equal to work done on or by the gas in the process. Reason : Temp2016Thermodynamic Processes
  14. 14A thermodynamic process is carried out from an original state to an intermediate state by the linear process shown in figure. The total work2015First Law of Thermodynamics
  15. 15Assertion : In an isolated system the entropy increases. Reason : The process in an isolated system is adiabatic only.2015Heat Engine, Refrigerator and Second Law of Thermodynamics
  16. 1670 calories of heat are required to raise the temperature of 2 moles of an ideal gas at constant pressure from to . The amount of heat requi2014Thermodynamic Processes
  17. 17Assertion: It is not possible for a system, unaided by an external agency to transfer heat from a body at lower temperature to another body 2014Heat Engine, Refrigerator and Second Law of Thermodynamics
  18. 18In a cyclic process, work done by the system is2013Thermodynamic Processes
  19. 19One mole of oxygen of volume 1 litre at pressure to attains pressure by result of isothermal expansion. Find work done by the gas.2013Thermodynamic Processes
  20. 20Graph of specific heat at constant volume for a monoatomic gas is2013First Law of Thermodynamics
  21. 21Which of the following is not a state function?2013Thermodynamic Systems
  22. 22An engine has an efficiency of . When the temperature of is reduced by , its efficiency is doubled. The temperature of source will be2013Heat Engine, Refrigerator and Second Law of Thermodynamics
  23. 23Conversion of water to steam is accompanied by which process?2012Thermodynamic Processes
  24. 24An ideal gas is taken through the cycle , as shown in figure. If the net heat supplied to the gas in the cycle is the work done by the gas i2012Thermodynamic Processes
  25. 25What is the slope for an isothermal process?2012Thermodynamic Processes
  26. 26For an adiabatic process2011Thermodynamic Processes
  27. 27For cyclic process which of the following quantity is zero?2011Thermodynamic Processes
  28. 28Assertion: During rapid pumping of air in tyres, air inside the tyre is hotter than atmospheric air. Reason : Adiabatic process occurs at ve2011Thermodynamic Processes
  29. 29Pressure versus temperature graph of an ideal gas is as shown in figure. Density of the gas at point is . Density at point will be2010Thermodynamic Processes
  30. 30A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by , the efficiency of the e2010Heat Engine, Refrigerator and Second Law of Thermodynamics
  31. 31Assertion : For an isothermal process in an ideal gas, the heat obsorbed by the gas is entirely used in the work done by the gas. Reason : D2009Thermodynamic Processes
  32. 32If there were no atmosphere, the average temperature on earth surface would be2008Thermodynamic Systems
  33. 33In an adiabatic change, the pressure and temperature of a monoatomic gas are related as \(P T^{ {C}}\), where \(C\) equals2007Thermodynamic Processes
  34. 34Assertion : In free expansion of an ideal gas, the entropy increases. Reason : Entropy increases in all natural processes.2007Heat Engine, Refrigerator and Second Law of Thermodynamics
  35. 35Two balloons are filled, on with pure He gas and other by air, respectively. If the pressure and temperature of these balloons are same then2006Thermodynamic Processes
  36. 36Assertion : In an isolated system the entropy increases. Reason : The processes in an isolated system are adiabatic.2006Heat Engine, Refrigerator and Second Law of Thermodynamics
  37. 37Assertion : The Carnot cycle is useful in understanding the performance of heat engines. Reason : The Carnot cycle provides a way of determi2006Heat Engine, Refrigerator and Second Law of Thermodynamics
  38. 38Assertion : When a glass of hot milk is placed in a room and allowed to cool, its entropy decreases. Reason : Allowing hot object to cool do2006Heat Engine, Refrigerator and Second Law of Thermodynamics
  39. 39Assertion : Reversible systems are difficult to find in real world. Reason : Most processes are dissipative in nature.2005Thermodynamic Systems
  40. 40Assertion : Air quickly leaking out of a balloon becomes cooler. Reason : The leaking air undergoes adiabatic expansion.2005Thermodynamic Processes
  41. 41moles of a monoatomic gas is carried round the reversible rectangular cycle as shown in the diagram. The temperature at is . The thermodynam2004Heat Engine, Refrigerator and Second Law of Thermodynamics
  42. 42Assertion : Thermodynamic process in nature are irreversible. Reason : Dissipative effects cannot be eliminated.2004Thermodynamic Systems
  43. 43Assertion : When a bottle of cold carbonated drink is opened, a slight fog forms around the opening. Reason : Adiabatic expansion of the gas2003Thermodynamic Processes
  44. 44The latent heat of vapourisation of water is . If the work done in the process of vapourisation of is , then increase in internal energy is2002First Law of Thermodynamics
  45. 45An engine is working. It takes 100 calories of heat from source and leaves 80 calories of heat to sink. If the temperature of source is , th2001Heat Engine, Refrigerator and Second Law of Thermodynamics
  46. 46Which of the following is path dependent?2001First Law of Thermodynamics

Frequently Asked Questions

1.How many questions are available for Thermodynamics?

This chapter includes 46 questions compiled from AIIMS papers spanning 2001 to 2019.

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

These are AIIMS questions specifically for the Thermodynamics chapter. Questions from other exams like NEET or JIPMER are organised separately under their respective exam sections.

3.Is Thermodynamics an important chapter for AIIMS Physics?

Thermodynamics has appeared in 19 of the 19 years of AIIMS papers covered here, with 46 questions across 21 papers - about 2 per paper it appears in.

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

Of the 46 questions analysed for this chapter, 61% are easy, 20% moderate and 20% tough. 2019 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 - 24 questions (52%)
  • Heat Engine, Refrigerator and Second Law of Thermodynamics - 13 questions (28%)
  • First Law of Thermodynamics - 5 questions (11%)
  • Thermodynamic Processes has produced the most tough questions (4).
6.Is Thermodynamics's weightage in AIIMS going up or down?

Across all 21 papers analysed, Thermodynamics has averaged about 2.2 questions per paper. In the last three years (2017–2019), that average has stayed about the same, at about 2.4 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.