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Thermodynamics — NEET Physics MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

30questions
10/14/6easy / medium / hard
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Sample questions from this chapter

What kind of description does thermodynamics primarily use?
  1. Macroscopic variables such as pressure, volume and temperature ✓
  2. Exact position and velocity of every molecule
  3. Only the chemical formula of the working substance
  4. Only the centre-of-mass motion of a system
Answer: A. Thermodynamics describes bulk equilibrium states using a few measurable macroscopic variables.
Why not B: Tracking every molecular coordinate belongs to a microscopic mechanical description.
Why not C: Composition alone does not specify a thermodynamic equilibrium state.
Why not D: Bulk translational motion is normally excluded from the internal thermodynamic description.
A system absorbs 500 J of heat and does 200 J of work. What is its internal-energy change?
  1. 700 J
  2. −300 J
  3. 300 J ✓
  4. −700 J
Answer: C. From ΔU=Q−W, the change is 500−200=300 J.
Why not A: This adds work to heat as if the 200 J were done on the system.
Why not B: This gives the correct magnitude but reverses the sign of the retained energy.
Why not D: This both adds the transfers and assigns a loss despite net energy input.
What is the efficiency of a reversible Carnot engine operating between 500 K and 300 K?
  1. 0.400 ✓
  2. 0.600
  3. 0.250
  4. 0.667
Answer: A. η=1−T_c/T_h=1−300/500=0.400.
Why not B: This uses T_c/T_h rather than subtracting that ratio from one.
Why not C: This divides the temperature difference by their sum.
Why not D: This divides the 200 K temperature difference by the cold-reservoir temperature.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Thermodynamics →

Other NEET Physics chapters

Units and MeasurementMotion in a Straight LineMotion in a PlaneLaws of MotionWork Energy and PowerSystems of Particles and Rotational Motion

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Questions

How many NEET questions are there on Thermodynamics?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Physics chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.