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1. |
A 100 W electric bulb was switched on in a 2.5 m × 3 m × 3 m size thermally insulated room having a temperature of 20°C. The room temperature at the end of 24 hours will be. (Take ​density of air = 1.2 kg/m3 and cv of air = 0.717 kJ/kg. |
A. | 321 °C |
B. | 341 °C |
C. | 450 °C |
D. | 470 °C |
Answer» E. | |