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Physics - Thermodynamics

Practise 7 IAT (IISER) previous year questions on Thermodynamics, compiled from papers spanning 2017 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty IAT (IISER) tests.

Thermodynamics has been asked in 7 of the 9 years of IAT (IISER) papers analysed (2017–2026), with 7 questions in all. 0% of them were easy, 86% moderate and 14% tough. Most of its questions came from 2026, with 1 question that year. In the last three years (2023–2026) it had 3 questions across 3 papers, about 1 per paper.

The chapter's 4 topics are not weighted equally: Thermodynamic Processes (3 questions, 43%), First Law of Thermodynamics (2 questions, 29%), and Heat Engine, Refrigerator and Second Law of Thermodynamics (1 question, 14%) have been asked the most. Thermodynamic Processes has also led over the last five years, with 2 questions. Heat Engine, Refrigerator and Second Law of Thermodynamics has produced the most tough questions (1).

  1. 1Consider two Carnot engines of efficiencies and . The first engine absorbs heat from a heat reservoir and releases heat to a heat reservoir 2026Heat Engine, Refrigerator andSecond Law of Thermodynamics
  2. 2One mole of an ideal gas of volume and temperature is allowed to expand adiabatically to volume while doing no external work. The universal 2024Thermodynamic Processes
  3. 3Consider a Carnot heat engine operating between a heat reservoir at temperature 600 K , and an external atmosphere at temperature 300 K . In2023Heat Engine, Refrigerator and Second Law of Thermodynamics
  4. 4A monoatomic ideal gas at pressure and volume is first adiabatically compressed to volume and then is allowed to expand isothermally back to2022Thermodynamic Processes
  5. 5An ideal rigid diatomic gas undergoes expansion at constant pressure when heat is added to it. What is the ratio of the change in the intern2020First Law of Thermodynamics
  6. 6Which of the following statements about the P-V diagram of an ideal gas of fixed number of particles is incorrect?2019Thermodynamic Processes
  7. 7One mole of an ideal gas is taken around the complete cycle as shown in the PV-diagram. Considering the universal gas constant R , the work 2017First Law of Thermodynamics

Frequently Asked Questions

1.How many questions are available for Thermodynamics?

This chapter includes 7 questions compiled from IAT (IISER) papers spanning 2017 to 2026.

2.Are these questions only from IAT (IISER), or from other exams too?

These are IAT (IISER) 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 IAT (IISER) Physics?

Thermodynamics has appeared in 7 of the 10 years of IAT (IISER) papers covered here, with 7 questions across 7 papers - about one per paper it appears in.

4.What is the difficulty level of Thermodynamics questions in IAT (IISER)?

Of the 7 questions analysed for this chapter, 0% are easy, 86% moderate and 14% tough. 2026 had the most, with 1 question.

5.Which topics in Thermodynamics should I focus on?

These topics have carried the most weightage in Thermodynamics:

  • Thermodynamic Processes - 3 questions (43%)
  • First Law of Thermodynamics - 2 questions (29%)
  • Heat Engine, Refrigerator and Second Law of Thermodynamics - 1 question (14%)
  • Heat Engine, Refrigerator and Second Law of Thermodynamics has produced the most tough questions (1).
6.Is Thermodynamics's weightage in IAT (IISER) going up or down?

Across all 7 papers analysed, Thermodynamics has averaged about 1.0 questions per paper. In the last three years (2023–2026), that average has stayed about the same, at about 1.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.