The ball being submerged halfway in the full glass of water will spill a volume of water equal to the volume of the ball that is being submerged, because the entire volume of the submerged ball was previously occupied by water and is not compressed should move out of the glass.This volume will be 10cm³ since the total of the ball is 20cm³ and it is submerged halfway.
There are no terminals on the wire where the bird is sitting. If the bird wants terminals, he must move to one end of the wire, but he will find only one terminal there. The other terminal is at the other end of the wire, conceivably hundreds of miles away. No species of bird extant in the modern world can accomplish such a span.