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5-question demo · Karnataka KPSC AEE Mechanical Engineering - Thermodynamics and Heat Transfer

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Question 1 of 5
“Heat cannot by itself flow from a body at a lower temperature to a body at a higher temperature” is a statement or consequence of
A The second law of thermodynamics
B conservation of momentum
C conservation of mass
D The first law of thermodynamics
Why: This statement describes the directional nature of heat flow, which is a direct consequence of the **second law of thermodynamics**. The second law states that heat flows spontaneously from higher to lower temperature bodies, and the reverse requires external work (like in a refrigerator). The first law is about energy conservation (\( \Delta U = Q - W \)), not direction. Conservation of momentum and mass are unrelated to heat transfer.[1]
Question 2 of 5
Define the Zeroth Law of Thermodynamics. What is its significance?
Why: The answer provides complete definition, structured significance with points and example, meeting 50-80 word requirement for short answer while being exam-ready.
Question 3 of 5
Two bodies A and B are separately in thermal equilibrium with a third body C. Are A and B in thermal equilibrium with each other? Explain using Zeroth Law.
Why: Direct application of Zeroth Law with reasoning and example, structured for full marks.
Question 4 of 5
A thermometer placed in liquid X reads 50°C, and when placed in liquid Y, it also reads 50°C. Are liquids X and Y in thermal equilibrium with each other?
Why: Complete reasoning with law statement, application, structured for exam scoring.
Question 5 of 5
State and explain the First Law of Thermodynamics. Why is it called the law of conservation of energy?
Why: Detailed structure with intro, points, example, applications; ~150 words for 3-4 marks level.