Answer
(a) less than
(b) I
Work Step by Step
(a) We know that if the temperature of the kitchen is decreased, the work done required to freeze the ice cubes will be less than that before the kitchen was cooled.
(b) The correct option is (I) -- that is, the difference in temperature between the inside and the outside of the refrigerator is decreased and hence less work is required to freeze the ice.
