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Thermodynamics — NEET & JEE 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

All 28 chapters →

Questions

How many NEET and JEE 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 and JEE 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.