The wettability of a surface by a liquid depends primarily on

The value of the contact angle for kerosene with a solid surface is ........ $^o$.

By adding soluble impurity in a liquid,the angle of contact

$A$ liquid does not wet the solid surface if the angle of contact is

$A$ liquid is filled in a spherical container of radius $R$ up to a height $h$. At this position,the liquid surface at the edges is horizontal. The contact angle is:

The liquid (mercury) meniscus in a capillary tube will be convex if the angle of contact is