Question

why are small drops of liquid spherical

Answer 1

liquid drops are spherical because of surface tension. ... Hence when smallamount of liquid is separated from rest in the form of drop, the whole amount of liquid gets in the most energy efficient shape i.e. sphere due to the attraction of atoms/molecules, which we call surface tension.

Answer 2

It is due to surface tension. It is the property of a liquid to acquire minimum surface area.