MDCAT 2026 inSee plans
Free mock test

Thermodynamics MCQs for MDCAT

2 Thermodynamics questions from real MDCAT past papers (2020), each with the correct answer and a written explanation.

2 questionsPhysics

Practice questions2 free

1Physicsthermodynamic processes

In which process the entire of heat supplie to the gas is converted to the internal energy of the gas?

  1. A.Isochoric process✓
  2. B.Isoharic process
  3. C.Isothermal process
  4. D.Adiabatic process

Explanation

In an isochoric (constant-volume) process no work is done (ΔV = 0), so any heat supplied changes only internal energy (ΔQ = ΔU). In isothermal ΔU = 0, and in adiabatic ΔQ = 0.

Open this question on its own page →
2Physicsisothermal process

The internal energy of a system during an isothermal process:

  1. A.Decrease
  2. B.Increase
  3. C.Becomes zero
  4. D.Remain constant✓

Explanation

For an ideal gas in an isothermal process the temperature is constant, and internal energy depends only on temperature, so internal energy remains constant. It neither increases nor decreases.

Open this question on its own page →

How Thermodynamics is examined

Thermodynamics sits in the official PMDC Physics curriculum, the document that defines what can and cannot appear in the 2026 paper. Everything on this page is tagged against that curriculum rather than against a chapter list invented for a website, which is why a chapter here matches the chapter your textbook and your teacher use.

Physics carries 36 of the 180 questions in the real paper - 20% of your MDCAT score, and the MDCAT is half your merit aggregate. PMDC does not publish how those 36questions are split across chapters, so no honest page can tell you “expect four from Thermodynamics”. What the archive can tell you is what actually appeared: 2 Thermodynamics questions out of the 37 Physics questions digitised so far.

That is a thin sample, and it is worth saying so plainly rather than dressing it up: with this few questions, the count tells you very little about how heavily Thermodynamics is examined. It grows as the remaining papers are digitised.

Frequently asked questions

How many Thermodynamics MCQs are on this page?
2, drawn from one past paper - the 2020 paper. Every one is transcribed from the real paper rather than written to look like a past paper question, and each carries the correct answer with a written explanation. 2 of them are readable in full without an account.
Is Thermodynamics in the MDCAT 2026 syllabus?
Yes. Thermodynamics is a chapter of the official PMDC Physics curriculum, and PMDC has confirmed the 2026 syllabus is unchanged from the 2025 revision, so everything on this page is still examinable.
How many Thermodynamics questions come up in the MDCAT?
PMDC does not publish a per-chapter breakdown, so nobody can tell you a reliable number - be careful with pages that do. What can be counted is the paper as a whole: Physics is 36 of the 180 questions, and 5% of the Physics questions in our archive so far have come from Thermodynamics.
Do these Thermodynamics MCQs come with explanations?
Yes, and they are written from scratch rather than copied. An answer letter tells you nothing about why the other three options are wrong, which is the part that transfers to the next question. The first 2 questions of every paper are free to read in full; the rest need a pass.

This chapter has too few questions in the archive to be a useful search result yet, so it is not submitted for indexing. It becomes a full page as the remaining papers are digitised.