If a capillary tube is dipped into a liquid and the levels of the liquid inside and outside are the same,then the angle of contact is ...... $^o$.

The raincoats are made waterproof by coating them with a material,which ............

Given below are two statements: One is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Clothes containing oil or grease stains cannot be cleaned by water wash.
Reason $(R)$: Because the angle of contact between the oil/grease and water is obtuse.
In the light of the above statements,choose the correct answer from the options given below.

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

Explain the angle of contact in the context of intermolecular forces.

$A$ glass plate is partly dipped vertically in mercury and the angle of contact is measured. If the plate is inclined,then the angle of contact will