21. A Carnot’s engine is made to work between 200°C and 0°C first and then between 0°C and –200°C. The ratio of efficiencies of the engine in the two cases is
(a) 1.73 : 1 (b) 1 : 1.73
(c) 1 : 1 (d) 1 : 2
Answer-b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a