If a liquid wets a surface,is its angle of contact acute or obtuse?

Fill in the blanks:
$(i)$ If a liquid sticks to the glass,the angle of contact for the liquid-glass interface will be ....... (acute / obtuse).
$(ii)$ The angle of contact between mercury and glass is .......... (acute / obtuse).

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

$A$ hydrophilic surface is characterised by the contact angle at the water-solid interface. The value of the contact angle should be:

Consider a spherical body,one third of its volume is filled with a liquid which has a contact angle of zero with the surface of the sphere. If this sphere (along with the liquid) is taken to gravity-free space,then the shape of the liquid inside the sphere will look like:

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