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Physics

Thermodynamics

The laws of thermodynamics, internal energy, and work done in isothermal and adiabatic processes lead up to heat engines and the Carnot cycle. Questions lean numerical: work or heat exchanged in a given process, engine efficiency, and reading P-V diagrams.

Exam rules change between cycles. Confirm dates, syllabus and pattern against NTA's official site. We are not NTA.

Weightage: what the paper actually did

Thermodynamics carried 1 question in the NEET 2026 paper. One paper is a data point, not a destiny: NTA moves weight between chapters every cycle, which is why the weightage tables deserve care. The stable facts are the paper's shape: 180 questions, 720 marks, +4 right, −1 wrong.

Sample PYQs from this chapter

Real questions NTA asked from Thermodynamics, with the answer and the working. Try before you peek.

Question 1 · NEET 2026

An electric heater supplies heat to a system at a rate of 100 W. If the system performs work at a rate of 75 J/s, then the rate at which internal energy increases will be:
  1. A.75 W
  2. B.100 W
  3. C.125 W
  4. D.25 W
Answer and explanation

Answer: D

By the first law of thermodynamics Q=ΔU+WQ = \Delta U + W. Differentiating with respect to time, dQdt=d(ΔU)dt+dWdt\frac{dQ}{dt} = \frac{d(\Delta U)}{dt} + \frac{dW}{dt}, so d(ΔU)dt=100−75=25\frac{d(\Delta U)}{dt} = 100 - 75 = 25 W. The distractors correspond to the given work rate (A), heat rate (B), or the incorrect sum (C). Why the other options are wrong: - (A) This is the work rate, not Δ\DeltaU rate. - (B) This is the heat supply rate. - (C) Adds instead of subtracting work.

How to practise Thermodynamics

Chapter by chapter, against real past-paper questions, on a screen: NEET is computer based from 2027. Read the chapter once, then attempt its PYQs until your accuracy stops climbing, and let the wrong answers tell you which lines to reread. If the chapter keeps refusing to stick, that has its own guide. There is also a free 12-question mock on the exam screen.

Nearby Physics chapters

Questions

How many questions did Thermodynamics have in NEET 2026?

Thermodynamics carried 1 question in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Thermodynamics PYQs for NEET?

In the BrainIt app, free until the 2027 exam: its bank holds 50,000 past NTA questions tagged to all 83 chapters, including this one, with accuracy tracked per chapter. A sample question from this chapter is on this page.

Is Thermodynamics important for NEET 2027?

It is part of the Physics syllabus the paper draws from, and NEET 2027 is computer based, so practise it on a screen. Your own accuracy in the chapter matters more than any weightage table: a heavy chapter you already score well on needs less time than a light one you keep missing.

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