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Mechanical Engineering Exam  >  Mechanical Engineering Test  >  Thermodynamics  >  Test: Entropy - 1 - Mechanical Engineering MCQ

Entropy - 1 - Free MCQ Practice Test with solutions, GATE ME Thermodynamics


MCQ Practice Test & Solutions: Test: Entropy - 1 (10 Questions)

You can prepare effectively for Mechanical Engineering Thermodynamics with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Entropy - 1". These 10 questions have been designed by the experts with the latest curriculum of Mechanical Engineering 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 30 minutes
  • - Number of Questions: 10

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Test: Entropy - 1 - Question 1
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A body of constant heat capacity Cp and Initial temperature T1 is placed in contact with a heat reservoir at temperature T2 and comes to isothermal equilibrium with it. If T2 > T1 what is the entropy change of the universe?

Detailed Solution: Question 1

Test: Entropy - 1 - Question 2
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When a system is in equilibrium, any conceivable change in entropy would be

Detailed Solution: Question 2

 at the peak of the entropy hill. 

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Test: Entropy - 1 - Question 3
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Match List-I (Laws of thermodynamics) with List-II (Defines) the following:

Test: Entropy - 1 - Question 4
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Consider the processes:

Process A: A heat source at 800 K loses 2000 kJ of heat to sink at 500 K.
Process B: A heat source at 800 K loses 2000 kJ of heat to sink at 750 K.
Which of the following can be concluded?

Detailed Solution: Question 4

Thus, total entropy change for the process B is smaller and therefore it is less irreversible.

Test: Entropy - 1 - Question 5
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A piston-cylinder device contains a liquid-vapor mixture of water at 300 K. During a constant- pressure process, 750 kJ of heat is transferred to the water. As a result, part of the liquid in the cylinder vaporizes. What is entropy change of the water during this process?

Detailed Solution: Question 5

The system undergoes an internally reversible, isothermal process, and thus its entropy change, 

Test: Entropy - 1 - Question 6
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The slope of constant pressure line on a T-s diagram is given by

Detailed Solution: Question 6

TdS= dH - VdP
TdS = Cp dT - VdP
TdS - Cp d T - 0
(for constant pressure process)

∴  

Test: Entropy - 1 - Question 7
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The slope of constant volume line on a T-s diagram is given by

Detailed Solution: Question 7


(for constant volume process)
∴  

Test: Entropy - 1 - Question 8
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The value of entropy at 0 K is taken as

Detailed Solution: Question 8

S = K ln W  
where, S is entropy
K is Boltzmann constant
W is thermodynamic probability
when W = 1, it represents the greatest order,
S = 0. This occurs only at T = 0 K. This is the Nernst-Simon statement of third law of themnodyanamics.

Test: Entropy - 1 - Question 9
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Choose the correct statement:

Test: Entropy - 1 - Question 10
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Which of the following second-law statements is incorrect?

Detailed Solution: Question 10

The entropy of the system (the sum of the entropies of the water and ice) must increase when the ice is melted in the water. This is because energy must be introduced to the system in the form of heat to break the bonds between the molecules of ice, increasing the entropy of the system.

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About this Mechanical Engineering Practice Test

This test contains 10 MCQs on Entropy - 1 with detailed solutions for each question. It is part of the Thermodynamics course on EduRev, designed to align with the current Mechanical Engineering syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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