9. An ideal heat engine exhausting heat at 77°C is to have a 30% efficiency. It must take heat at
(a) 127°C (b) 227°C
(c) 327°C (d) 673°C
Answer-b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a