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JEE Main 28 Jan 2025 Shift 1 Paper

Section: Physics

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Question : 31

Total: 75

A Carnot engine (E) is working between two temperatures 473 K and 273 K . In a new system two engines - engine E1 works between 473 K to 373 K and engine E2 works between 373 K to 273 K. If η12,η1 and η2 are the efficiencies of the engines E,E1 and E2 respectively, then

[28 Jan 2025 Shift 1]

η12=η1+η2
η12≥η1+η2
η12<η1+η2
η12=η1η2

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