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Physics - Thermodynamics

Practise 203 AP EAMCET previous year questions on Thermodynamics, compiled from papers spanning 2001 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 AP EAMCET tests.

Thermodynamics has been asked in 24 of the 24 years of AP EAMCET papers analysed (2001–2024), with 203 questions in all. 53% of them were easy, 38% moderate and 9% tough. Most of its questions came from 2024, with 26 questions that year. In the last three years (2022–2024) it had 65 questions across 28 papers, about 2.3 per paper.

The chapter's 5 topics are not weighted equally: Thermodynamic Processes (95 questions, 47%), Heat Engine, Refrigerator and Second Law of Thermodynamics (53 questions, 26%), and First Law of Thermodynamics (41 questions, 20%) have been asked the most. Thermodynamic Processes has also led over the last five years, with 49 questions. Thermodynamic Processes has produced the most tough questions (11).

  1. 1The efficiency of a Carnot's heat engine is . If the temperature of the source is decreased by and the temperature of the sink is increased 27 May, 2025 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  2. 2The change in internal energy of given mass of a gas, when its volume changes from V to 3 V at constant pressure P is ( - Ratio of the speci27 May, 2025 (M)First Law of Thermodynamics
  3. 3A monatomic gas at a pressure of 100 kPa expands adiabatically such that its final volume becomes 8 times its initial volume. If the work do27 May, 2025 (M)Thermodynamic Processes
  4. 4The ratio of the efficiencies of two Carnot engines A and B is 1.25 and the temperature difference between the source and the sink is same i26 May, 2025 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  5. 5The heat supplied to a gas at a constant pressure of is 1000 kJ. If the volume of gas changes from to , then the change in internal energy o26 May, 2025 (M)First Law of Thermodynamics
  6. 6When an ideal diatomic gas undergoes adiabatic expansion, if the increase in its volume is , then the change in the pressure of the gas is26 May, 2025 (M)Thermodynamic Processes
  7. 7If 5.6 litres of a monoatomic gas at STP is adiabatically compressed to 0.7 litres, then the work done on the gas is nearly (R - Universal g26 May, 2025 (E)Thermodynamic Processes
  8. 8When 80 J of heat is supplied to a gas at constant pressure, if the work done by the gas is 20 J, then the ratio of the specific heat capaci24 May, 2025 (M)First Law of Thermodynamics
  9. 9A refrigerator of coefficient of performance 5 that extracts heat from the cooling compartment at the rate of 250 J per cycle is placed in a24 May, 2025 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  10. 10In a Carnot engine, if the work done during isothermal expansion is more than the work done during isothermal compression, then the efficien23 May, 2025 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  11. 11The work done to increase the volume of 2 moles of an ideal gas from V to 2 V at a constant temperature T is W. The work to be done to incre23 May, 2025 (M)First Law of Thermodynamics
  12. 12If the given graph shows the logarithmic values of pressure and volume of an ideal gas, then the ratio of the specific heat capacities of th23 May, 2025 (M)Thermodynamic Processes
  13. 13In a Carnot engine, if the absolute temperature of the source is more than the absolute temperature of the sink, then the efficiency of the 23 May, 2025 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  14. 14The work done by 6 moles of helium gas when its temperature increases by at constant pressure is (Universal gas constant )23 May, 2025 (E)Thermodynamic Processes
  15. 15If a heat engine and a refrigerator are working between the same two temperatures and , then the ratio of efficiency of heat engine to coeff23 May, 2025 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  16. 16A Carnot heat engine absorbs 600 J of heat from a source at a temperature of and rejects 400 J of heat to a sink in each cycle. The temperat22 May, 2025 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  17. 17During adiabatic expansion, if the temperature of 3 moles of a diatomic gas decreases by , then the work done by the gas is (R - Universal g22 May, 2025 (M)Thermodynamic Processes
  18. 18The fundamental limitation to the coefficient of performance of a refrigerator is given by22 May, 2025 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  19. 19A Carnot engine A working between temperatures 600 K and T=$22 May, 2025 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  20. 20When an ideal diatomic gas is heated at constant pressure, the fraction of the heat utilised to increase the internal energy of the gas is22 May, 2025 (E)Thermodynamic Processes
  21. 21According to zeroth law of thermodynamics, the physical quantity which is same for two bodies in thermal equilibrium is21 May, 2025 (M)Thermodynamic Systems
  22. 22If a refrigerator of coefficient of performance of 5 has a freezer at a temperature of , then the room temperature is21 May, 2025 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  23. 23From the figure shown for a thermodynamic system, match the curves with their respective thermodynamic processes. (P - Pressure and V - volu21 May, 2025 (M)Thermodynamic Processes
  24. 24If 2 moles of an ideal monoatomic gas at a temperature of is mixed with 4 moles of another ideal monoatomic gas at a temperature of , then t21 May, 2025 (M)First Law of Thermodynamics
  25. 25If a gas of volume 400 cc at an initial pressure is suddenly compressed to 100 cc, then its final pressure is (The ratio of the specific hea21 May, 2025 (E)Thermodynamic Processes
  26. 26A Carnot engine having efficiency receives heat from a source at a temperature 600 K. For the same sink temperature, to increase its efficie21 May, 2025 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  27. 27When 2 moles of a monatomic gas expands adiabatically from a temperature of to , the work done is W . The work done when 3 moles of a diatom23 May, 2024 (M)Thermodynamic Processes
  28. 28A gas absorbs 18 J of heat and work done on the gas is 12 J, Then the change in internal energy of the gas23 May, 2024 (M)First Law of Thermodynamics
  29. 29If the ratio of the absolute temperature of the sink and source of a Carnot engine is changed from to , the efficiency of the engine changes23 May, 2024 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  30. 30Initially the pressure of 1 mole of an ideal gas is and its volume is 16 litre. When it is adiabatically compressed, its final volume is 2 l22 May, 2024 (M)Thermodynamic Processes
  31. 31An ideal gas is taken around ABCA as shown in the diagram. The work done during a cycle is22 May, 2024 (M)Thermodynamic Processes
  32. 32Two ideal gases A and B of same number of moles expand at constant temperatures and respectively such that the pressure of gas A decreases b22 May, 2024 (E)Thermodynamic Processes
  33. 33When 80 J of heat is absorbed by a monotonic gas, its volume increases by . The pressure of the gas is22 May, 2024 (E)First Law of Thermodynamics
  34. 34The efficiency of a Carnot heat engine is and the temperature of its source is . Without changing the temperature of the source, if absolute22 May, 2024 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  35. 35The total internal energy of 2 moles of a monotomic gas at a temperature is U . The total internal energy of 3 moles of a diatomic gas at a 22 May, 2024 (E)First Law of Thermodynamics
  36. 36A monoatomic gas of -moles is heated from temperature to under two different conditions. (i) at constant volume and (ii) at constant pressur21 May, 2024 (M)First Law of Thermodynamics
  37. 37In a Carnot engine, when the temperatures are and , its efficiency is and when the temperatures are and , its efficiency is . Then the value21 May, 2024 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  38. 38Heat energy absorbed by a system going through the cyclic process shown in the figure is21 May, 2024 (M)Thermodynamic Processes
  39. 39An ideal gas is found to obey constant during an adiabatic process. If such a gas initially at a temperature T is aḍiabatically compressed t21 May, 2024 (E)Thermodynamic Processes
  40. 40The condition holds good in the following process21 May, 2024 (E)Thermodynamic Processes
  41. 41The efficiency of a Carnot engine found to increase from to on increasing the temperature ( ) of source alone through 100 K . The temperatur21 May, 2024 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  42. 42The efficiency of a Carnot cycle is . By lowering the temperature of sink by 65 K , it increases to . The initial and final temperature of t20 May, 2024 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  43. 43In a cold storage, ice melts at the rate of 2 kg per hour when the external temperature is . The minimum power output of the motor used to d20 May, 2024 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  44. 44A Carnot engine has the same efficiency between 800 K and 500 K . and and 600 K . The value of ' ' is20 May, 2024 (M)Heat Engine, Refrigerator and Second Law of Thermodynamics
  45. 45A certain volume of a gas at 300 K expands adiabatically until its volume is doubled. The resultant fall in temperature of the gas is nearly20 May, 2024 (E)Thermodynamic Processes
  46. 46The efficiency of a Carnot's engine is , when the temperature of sink is 300 K . The increase in the temperature of source required for the 20 May, 2024 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  47. 47When 100 J of heat is supplied to a gas, the increase in the internal energy of the gas is 60 J . Then the gas is/can20 May, 2024 (E)First Law of Thermodynamics
  48. 48An ideal heat engine operates in Carnot cycle between and . It absorbs of heat at higher temperature. Amount of heat converted to work is19 May, 2024 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  49. 49A Carnot heat engine has an efficiency of . If the same engine is worked backward to obtain a refrigerator, then the coefficient of performa19 May, 2024 (E)Heat Engine, Refrigerator and Second Law of Thermodynamics
  50. 50The work done by an ideal gas of 2 moles in increasing its volume from V to 2 V at constant temperature T is W . The work done by an ideal g18 May, 2024 (M)Thermodynamic Processes

Frequently Asked Questions

1.How many questions are available for Thermodynamics?

This chapter includes 203 questions compiled from AP EAMCET papers spanning 2001 to 2025.

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

These are AP EAMCET 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 AP EAMCET Physics?

Thermodynamics has appeared in 25 of the 25 years of AP EAMCET papers covered here, with 203 questions across 93 papers - about 2 per paper it appears in.

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

Of the 203 questions analysed for this chapter, 53% are easy, 38% moderate and 9% tough. 2024 had the most, with 26 questions.

5.Which topics in Thermodynamics should I focus on?

These topics have carried the most weightage in Thermodynamics:

  • Thermodynamic Processes - 95 questions (47%)
  • Heat Engine, Refrigerator and Second Law of Thermodynamics - 53 questions (26%)
  • First Law of Thermodynamics - 41 questions (20%)
  • Thermodynamic Processes has produced the most tough questions (11).
6.Is Thermodynamics's weightage in AP EAMCET going up or down?

Across all 93 papers analysed, Thermodynamics has averaged about 2.2 questions per paper. In the last three years (2022–2024), that average has stayed about the same, at about 2.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.