30. An ideal refrigerator has a freezer at a temperature of
-130c . The coefficient of performance of the engine is 5. The temperature of the air (to which heat is rejected) will be
(a) 325°C (b) 325K
(c) 39°C (d) 320°C
Ans. c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a