Question

Why the freezer compartment in a refrigerator is usually put near its top?

Answer 1

It is not necessary..... There are refrigerators which have their freezer at the bottom.....

Freezer is the source for the refrigerator's coldness. When the freezer is placed on top, the cold air produced from it is denser than the warmer air in the bottom. So cold air being dense sinks down and the warm air is forced to rise up so when the warm air rises up it and gets cold in the freezer.

Hope it helps.......