The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is –20°C, the temperature of the surroundings to which it rejects heat is
21°C
31°C
41°C
11°C
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A piece of ice falls from a height h so that it melts completely. Only one–quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is[Latent heat of ice is 3.4 × 105 J/kg and g = 10 N/kg]