$A$ liquid does not wet the sides of a solid,if the angle of contact is

If the surface of a liquid is plane,then the angle of contact of the liquid with the walls of the container is

Give reason: The wing of a duck does not get wet in water.

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

$A$ 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 meniscus in a capillary tube will be convex,if the angle of contact is