Good Riddles

Question: I never was. Am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all who live and breathe. What am I ?

Question: I am king of knowledge , also the king of madness Who am i ?

Question: What type of car does a sheep drives?

Question: I give light by night, but not by day, Am wicked but not evil in any way, Wax for the most but always wane, Except when I'm out, I stay the same. What am I?

Question: There were 2 doors. Behind the 1 door, is hell and behind the other door, is heaven but you don't know which door will take you to heaven. In front of them, there were 2 brothers, which is guarding the door. One of the brother always lie and the other one always tell the truth. Of course you don't know who is lying and who is not. You only get 1 question to ask one of them to figure out which door leads to heaven. What question you might ask? Remember you only get to ask 1 question. it means that you can't ask one question each of them. that will be 2 questions. You only ask 1 question to any of them and no more. How do you do that?