Class 11 Physics — Chapter 12: Thermodynamics
66 practice questions · 22 Easy · 22 Medium · 22 Hard
Practise Class 11 Physics Chapter 12, "Thermodynamics", with 66 NCERT-aligned multiple-choice questions. The set is split into 22 Easy, 22 Medium and 22 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Thermodynamics" is one of the chapters where numerical problem-solving, derivations and conceptual application really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Thermodynamics, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 11 Physics mastery score. A few sample questions are shown below; sign in free to practise all 66.
Key concepts: Thermodynamics (Class 11 Physics)
This chapter covers the laws of thermodynamics, thermodynamic processes, heat engines, refrigerators and the Carnot cycle.
- Zeroth & first laws
- Zeroth law defines temperature via thermal equilibrium; the first law is energy conservation: ΔU = Q − W.
- Thermodynamic processes
- Isothermal (constant T), adiabatic (no heat exchange), isobaric (constant P) and isochoric (constant V).
- Second law
- Heat cannot flow spontaneously from cold to hot; no engine can be 100% efficient (entropy never decreases).
- Heat engine & refrigerator
- An engine converts heat to work (efficiency η = W/Q₁); a refrigerator does the reverse, rated by coefficient of performance.
- Carnot engine
- The ideal reversible engine; its efficiency η = 1 − T₂/T₁ is the maximum possible between two temperatures.
Key formulas — Thermodynamics
💡 Exam tips for Thermodynamics
- Mind the sign convention: Q positive when added to the system, W positive when done BY the system.
- No real engine can beat the Carnot efficiency between the same two temperatures.
Sample questions
Zeroth law of thermodynamics defines:
Two systems in equilibrium with a third are in equilibrium with each other → T.
In an isothermal process, ΔT = 0, so for ideal gas ΔU =
Internal energy of ideal gas depends only on T.
Efficiency of Carnot engine: η = 1 −
Maximum efficiency: η_C = 1 − T_c/T_h.
Thermodynamics — FAQs
What are the key concepts in Class 11 Physics Thermodynamics?+
This chapter covers the laws of thermodynamics, thermodynamic processes, heat engines, refrigerators and the Carnot cycle. Key ideas include Zeroth & first laws, Thermodynamic processes, Second law, Heat engine & refrigerator, Carnot engine.
What does Class 11 Physics Chapter 12 (Thermodynamics) cover on XamBaaz?+
It covers 66 NCERT-aligned MCQs on "Thermodynamics" — 22 Easy, 22 Medium and 22 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Thermodynamics" questions free to practise?+
Yes — sign in with Google to practise "Thermodynamics" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Thermodynamics" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
Practise all 66 questions free
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