AAI ATC Junior Executive 25 Mar 2021 Shift 2 Paper

A thermacole cubical icebox of side 20 cm has a thickness of 4.0 cm. If 5.0 kg of ice is put in the box, estimate the amount of ice remaining after 5 h. The outside temperature is 35° C, and coefficient of thermal conductivity of thermacole is 0.01 J s^-1 m^-1 K^-1 . (Heat of fusion of water = 335 × 10³ J kg^-1)