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Entropy & Heat Engines

Explore entropy, Carnot ideas, and engine efficiency limits. Ideal for students preparing board exams and competitive tests.

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Entropy & Heat Engines
QUESTION NO 01
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Entropy of an isolated system in a spontaneous process?

Answer: Increases or stays the same
Second law: entropy of an isolated system never decreases.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
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QUESTION NO 02
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Heat engine efficiency cannot be 100% because of?

Answer: Second law of thermodynamics
The second law forbids a perfect heat engine that converts all heat to work with no other effect.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
302 Quizzes
2930 Questions
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QUESTION NO 03
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Conduction is heat transfer through?

Answer: Direct molecular contact in matter
Conduction transfers heat via particle collisions/contact within a material.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
302 Quizzes
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QUESTION NO 04
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Convection involves heat transfer by?

Answer: Bulk movement of fluid
Convection is heat carried by macroscopic motion of a fluid.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
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QUESTION NO 05
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Radiation can transfer heat through?

Answer: Vacuum
Thermal radiation (EM waves) propagates through vacuum.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
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QUESTION NO 06
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Triple point of water is approximately?

Answer: 0.01 °C at 611 Pa
Water's triple point is 0.01 °C and about 611.657 Pa.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
302 Quizzes
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QUESTION NO 07
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Internal energy of an ideal gas depends only on?

Answer: Temperature
For an ideal gas, U is a function of temperature alone.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
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QUESTION NO 08
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A process at constant pressure is called?

Answer: Isobaric
Isobaric means constant pressure.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
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QUESTION NO 09
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A process at constant volume is called?

Answer: Isochoric
Isochoric (isovolumetric) means constant volume; W = 0 for quasi-static PdV work.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
302 Quizzes
2930 Questions
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QUESTION NO 10
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Zeroth law of thermodynamics introduces the concept of?

Answer: Temperature
Zeroth law justifies temperature as a transitive equilibrium property.
Shahzad Mahota
Shahzad Mahota @shahzad-mahota
302 Quizzes
2930 Questions
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Shahzad Mahota

@shahzad-mahota

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