Solved UPSC CDS/OTA Question
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Q · Heat and ThermodynamicsMedium · 45s
The efficiency of a Carnot engine operating between 500 K and 300 K is:
TopicHeat and Thermodynamics
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
← Previous questionQ 30 / 30
Step-by-Step Solution
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Every step explained — no skipped algebra.
η = 1 – T₂/T₁ = 1 – 300/500 = 0.4 = 40%.
Final Answer: Option C — 40%