JEE Main 2012 — Thermodynamics Question with Solution
JEE Main 2012 (19 May Online)
Question
This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement 1: An inventor claims to have constructed an engine that has an efficiency of when operated between the boiling and freezing points of water. This is not possible.
Statement 2: The efficiency of a real engine is always less than the efficiency of a Carnot engine operating between the same two temperatures.
Choose an option
Show full solutionCorrect option: D
Correct answer
DStatement 1 is true, Statement 2 is true, Statement 2 is the correct explanation of Statement 1.
Step-by-step explanation
According to Carnot's theorem - no heat engine working between two given temperatures of source and sink can be more efficient than a perfectly reversible engine i.e. Carnot engine working between the same two temperatures.
Efficiency of Carnot's engine, where, temperature of source temperature of sink
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This is a previous-year question from JEE Main 2012, covering the Thermodynamics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.