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CBSE Class 11 Chemistry MCQs on Thermodynamics Laws and Applications (With Answers)
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Free Online Practice Test – Thermodynamics Laws and Applications (CBSE Class 11)
Introduction
Understanding the Laws of Thermodynamics and their Applications is crucial for mastering CBSE Class 11 Chemistry, especially Chapter 6 of Physical Chemistry. These laws form the foundation of energy transformation, spontaneity, and equilibrium — essential principles for both board exams and competitive exams like JEE and NEET.
This online MCQ practice test is designed strictly according to the NCERT Class 11 Chemistry syllabus. It covers the Zeroth, First, Second, and Third Laws of Thermodynamics, including key applications such as heat engines, refrigerators, entropy, Gibbs free energy, and spontaneity criteria.
Each multiple-choice question includes detailed explanations, helping students understand core concepts such as energy conservation (ΔU = q + w), Carnot efficiency, and entropy changes in reversible and irreversible processes.
Ideal for CBSE board exam preparation, this interactive quiz allows students to test conceptual clarity within a 30-minute timed session and receive instant scoring and feedback. Strengthen your understanding of Thermodynamics Laws and their real-world applications through this NCERT-based MCQ test.
Sample MCQs (With Answers and Explanations)
Q1. Which law of thermodynamics introduces the concept of temperature?
A) First Law
B) Second Law
C) Zeroth Law
D) Third Law
✅ Answer: C) Zeroth Law
Explanation: The Zeroth Law establishes the basis of temperature measurement, stating that if two systems are each in thermal equilibrium with a third, they are in equilibrium with each other.
Q2. The First Law of Thermodynamics is based on which principle?
A) Conservation of Energy
B) Conservation of Mass
C) Conservation of Momentum
D) Conservation of Entropy
✅ Answer: A) Conservation of Energy
Explanation: The First Law states that energy can neither be created nor destroyed; it only changes forms — mathematically, ΔU = q + w.
Q3. Which thermodynamic quantity increases in a spontaneous process for an isolated system?
A) Enthalpy
B) Entropy
C) Internal Energy
D) Temperature
✅ Answer: B) Entropy
Explanation: According to the Second Law, in an isolated system, spontaneous processes always increase the total entropy of the universe.
Q4. The Carnot engine operates between 500 K and 300 K. Its efficiency is:
A) 60%
B) 50%
C) 40%
D) 80%
✅ Answer: A) 60%
Explanation: η = 1 – (T₂/T₁) = 1 – (300/500) = 0.6 or 60%. The Carnot cycle defines the maximum efficiency achievable between two reservoirs.
Q5. According to the Third Law of Thermodynamics, the entropy of a perfect crystal at 0 K is:
A) Infinite
B) Zero
C) One
D) Constant
✅ Answer: B) Zero
Explanation: The Third Law states that the entropy of a perfectly crystalline substance approaches zero as temperature approaches absolute zero (0 K).
✅ Highlight:
These MCQs are designed strictly as per NCERT Class 11 Chemistry syllabus, ideal for CBSE Board Exams, JEE, and NEET preparation.