Physics XI  ·  Chapter 11  ·  NCERT

Thermodynamics
MCQ Master Series

50 precision-crafted questions · CBSE · JEE Main · JEE Advanced

🎯 50 Questions
⏱ 35 min Suggested
📊 3 Difficulty Tiers
🔥 6 Core Topics
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Question Intelligence

Quiz Analytics

A data-driven breakdown of the 50 questions by difficulty, exam origin and topic distribution.

📈 Distribution Overview

50
Total Questions
CBSE Level
25
JEE Main Level
14
JEE Advanced Level
11

🗂 Topic Coverage

Zeroth & First Law
18%
Thermodynamic Processes
24%
Second Law & Entropy
22%
Carnot Engine & COP
16%
Heat Engines & Refrigerators
12%
P–V Diagrams & Curves
8%
25
CBSE XI
14
JEE Main
11
JEE Adv.
Conceptual Framework

Key Concept Highlights

Six foundational pillars that power every question in this quiz. Understand these, and the answers follow naturally.

🌡️
Thermodynamic State
State variables (P, V, T, U) vs. path functions (Q, W). The zeroth law establishes thermal equilibrium.
🔁
Thermodynamic Processes
Isothermal, adiabatic, isochoric, isobaric — each with unique PV relationships and work expressions.
⚙️
First Law of Thermodynamics
ΔU = Q − W. Energy conservation applied to heat and mechanical work in a system.
🌀
Second Law & Entropy
Entropy always increases in spontaneous processes. Reversibility is an idealised limit.
🔥
Carnot Engine
The most efficient engine operating between two temperatures. η = 1 − T_C/T_H.
❄️
Refrigerators & COP
Reverse heat engine; COP = Q_C / W. Clausius statement forbids spontaneous cold-to-hot flow.
Pedagogical Value

Why MCQs Matter

Multiple-choice questions are not mere guessing games — they are the sharpest diagnostic tool available to a competitive exam aspirant.

~30%

of JEE Main Physics marks come from
Thermodynamics & related chapters

Consistent top-scorer chapter since 2019
Quick Reference

Important Formula Capsules

Eight must-memorise equations that surface repeatedly across CBSE and JEE papers.

First Law
\[ \Delta U = Q - W \]
Isothermal Work
\[ W = nRT\ln\!\left(\dfrac{V_f}{V_i}\right) \]
Adiabatic
\[ PV^{\gamma} = \text{const},\quad TV^{\gamma-1} = \text{const} \]
Carnot Efficiency
\[ \eta = 1 - \dfrac{T_C}{T_H} \]
COP (Refrigerator)
\[ \text{COP} = \dfrac{Q_C}{W} = \dfrac{T_C}{T_H - T_C} \]
Entropy Change
\[ \Delta S = \dfrac{Q_{\text{rev}}}{T} \]
Ideal Gas
\[ PV = nRT \]
Adiabatic Slope
\[ \left(\dfrac{dP}{dV}\right)_{\text{ad}} = -\gamma\dfrac{P}{V} \]
Learning Outcomes

What You Will Learn

By completing this quiz set you will have exercised all the following competencies.

01 Distinguish between state functions and path functions with confidence
02 Sketch and interpret P–V diagrams for all four standard processes
03 Apply the First Law to solve numerical problems in CBSE & JEE format
04 Derive and apply Carnot efficiency and COP formulae
05 Explain the Second Law, entropy, and why perpetual machines are impossible
06 Identify reversible vs. irreversible processes in real-world scenarios
07 Solve JEE-Advanced level conceptual questions on entropy and free expansion
Exam Preparation

Strategy & Preparation Tips

Five evidence-based strategies for maximising your Thermodynamics score in CBSE Boards and JEE.

Step 01
Master the Laws First
Memorise the zeroth, first and second laws verbatim — CBSE often tests exact statements.
Step 02
P–V Diagram Fluency
Practise drawing and comparing all four process curves. Relative slopes (adiabatic steeper than isothermal) are a recurring MCQ trap.
Step 03
Formula Derivation
Derive isothermal work and Carnot efficiency yourself at least twice — derivation insight helps in novel JEE problems.
Step 04
Entropy as a Concept
For JEE Advanced, focus on qualitative understanding: entropy always increases in isolated spontaneous processes.
Step 05
Timed Mock Runs
Attempt this 50-question set in under 35 minutes to simulate JEE Main pacing (≈ 42 s per question).

Ready to Test Your Mastery?

50 questions · Elapsed timer · Instant scored results

⚡ Begin Thermodynamics Quiz
🎯 Knowledge Check

Physics — THERMODYNAMICS

50 Questions Class 11 MCQs
1
Which physical quantity is used to measure the degree of hotness of a body?
(Exam: CBSE – Class XI)
2
Which of the following is a thermodynamic state variable?
(Exam: CBSE – Class XI)
3
The SI unit of heat is
(Exam: CBSE – Class XI)
4
Which law of thermodynamics defines temperature?
(Exam: CBSE – Class XI)
5
For an ideal gas, internal energy depends only on
(Exam: CBSE – Class XI)
6
Which process occurs at constant temperature?
(Exam: CBSE – Class XI)
7
Work done in an isochoric process is
(Exam: CBSE – Class XI)
8
In an adiabatic process
(Exam: CBSE – Class XI)
9
The first law of thermodynamics is a statement of
(Exam: CBSE – Class XI)
10
Which of the following quantities is path-dependent?
(Exam: CBSE – Class XI)
11
The equation \(PV = nRT\) represents
(Exam: CBSE – Class XI)
12
A quasi-static process is one which is
(Exam: CBSE – Class XI)
13
In a cyclic process, change in internal energy is
(Exam: CBSE – Class XI)
14
The slope of an isothermal curve on a \(P\!-\!V\) diagram is
(Exam: CBSE – Class XI)
15
Which process gives maximum work output?
(Exam: CBSE – Class XI)
16
For an adiabatic process, the relation between \(P\) and \(V\) is
(Exam: CBSE – Class XI)
17
The efficiency of a heat engine is always
(Exam: CBSE – Class XI)
18
The Kelvin–Planck statement is related to
(Exam: CBSE – Class XI)
19
The Clausius statement forbids
(Exam: CBSE – Class XI)
20
Which of the following is an irreversible process?
(Exam: CBSE – Class XI)
21
The entropy change in a reversible process is
(Exam: CBSE – Class XI)
22
The working of a refrigerator is based on
(Exam: CBSE – Class XI)
23
The Carnot engine operates between
(Exam: CBSE – Class XI)
24
Carnot efficiency depends on
(Exam: CBSE – Class XI)
25
A process in which no heat is exchanged but temperature changes is
(Exam: CBSE – Class XI)
26
In an isothermal expansion of an ideal gas, the change in internal energy is
(Exam: JEE Main Level)
27
For a reversible isothermal process, work done is
(Exam: JEE Main Level)
28
The area under a \(P\!-\!V\) curve represents
(Exam: JEE Main Level)
29
Which process has the steepest curve on a \(P\!-\!V\) diagram?
(Exam: JEE Main Level)
30
The quantity that measures irreversibility of a process is
(Exam: JEE Advanced Level)
31
For an ideal gas undergoing a reversible adiabatic expansion, which of the following remains constant?
(Exam: JEE Main Level)
32
In a Carnot cycle, the number of isothermal processes involved is
(Exam: JEE Main Level)
33
The coefficient of performance (COP) of a refrigerator is defined as
(Exam: JEE Main Level)
34
Which of the following statements is correct for a reversible process?
(Exam: JEE Main Level)
35
A gas expands freely into vacuum. The process is
(Exam: JEE Main Level)
36
Which condition is essential for reversibility of a heat transfer process?
(Exam: JEE Main Level)
37
The efficiency of a Carnot engine operating between temperatures \(T_H\) and \(T_C\) is
(Exam: JEE Main Level)
38
In which of the following processes does the temperature of an ideal gas necessarily decrease?
(Exam: JEE Main Level)
39
Which quantity determines the maximum possible work obtainable from a system?
(Exam: JEE Advanced Level)
40
The second law of thermodynamics introduces the concept of
(Exam: JEE Advanced Level)
41
A Carnot engine working as a refrigerator will
(Exam: JEE Advanced Level)
42
Which of the following is NOT a state function?
(Exam: JEE Advanced Level)
43
For a cyclic process, the net heat absorbed equals
(Exam: JEE Advanced Level)
44
The slope of an adiabatic curve on a \(P\!-\!V\) diagram compared to an isothermal curve is
(Exam: JEE Advanced Level)
45
Which of the following engines has the maximum efficiency?
(Exam: JEE Advanced Level)
46
A process in which both heat exchange and work done are zero is
(Exam: JEE Advanced Level)
47
Which statement best defines entropy?
(Exam: JEE Advanced Level)
48
Entropy of an isolated system during a spontaneous process
(Exam: JEE Advanced Level)
49
Which of the following is impossible according to the second law?
(Exam: JEE Advanced Level)
50
A perpetual motion machine of the second kind violates
(Exam: JEE Advanced Level)
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Thermodynamics is a concept-driven and application-intensive chapter that plays a crucial role in Class XI Physics as well as in competitive examinations such as CBSE Board Exams, JEE (Main & Advanced), and NEET. Mastery of this chapter requires not only a clear understanding of definitions and laws, but also the ability to apply concepts logically in numerical and reasoning-based questions. The following Multiple Choice Questions (MCQs) are carefully designed to strengthen conceptual clarity,…
🎓 Class 11 📐 Physics 📖 NCERT ✅ Free Access 🏆 CBSE · JEE
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Frequently Asked Questions

Thermodynamics is the branch of physics that deals with heat, work, energy, and the laws governing their interconversion in macroscopic systems.

A thermodynamic system is a specified quantity of matter or a region of space chosen for study, separated from its surroundings by a real or imaginary boundary.

The surroundings include everything outside the thermodynamic system that can interact with it by exchanging heat or work.

The thermodynamic state of a system is its condition described completely by state variables such as pressure, volume, and temperature.

State variables are physical quantities whose values depend only on the current state of the system and not on the path followed.

Pressure, volume, temperature, internal energy, entropy, and enthalpy are state variables.

Path variables are quantities whose values depend on the path taken during a process, such as heat and work.

A system is in thermodynamic equilibrium when it is simultaneously in thermal, mechanical, and chemical equilibrium.

An equation of state is a mathematical relation connecting state variables of a system in equilibrium, such as \(PV = nRT\).

An ideal gas is a hypothetical gas whose molecules do not interact except during elastic collisions and obey the ideal gas equation exactly.

The ideal gas equation is \(PV = nRT\), where symbols have their usual meanings.

Internal energy is the total microscopic energy of a system arising from molecular motion and interactions.

The internal energy of an ideal gas depends only on temperature.

The first law states that heat supplied to a system equals the increase in internal energy plus work done by the system.

\(\Delta Q = \Delta U + W\).

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