a skewer and a fork.
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i think its a skewer, im rubbish at chess terms. i don't actually study it at all, i just tried it and found that i was naturally ok at it. so don't pester me =D
The first is discovered check. The second is a knight fork. For a skewer, think of a shish kabob stick with the vegetables and meat and stuff on it. Now think of for instance a bishop controlling a diagonal with a bunch of rooks on it.
its not a discovered check, the bishop you move is the bishop that checks. the king isnt a rook.
BxN+ is a discovered check.