Logic Riddles

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?

Question: What always goes up when it rains?

Question: There were 2 trains heading the opposite directions on the same track.1 was going North, and one was going south, There was a 100m gap between them, avoiding the collision, 2 men saved the trains from colliding on time, Who were they and how did they save them?

Question: There is a 5 letter word, if you take away the 5th letter, it is still the same. If you take away the 1st letter it is also the same. Even if you take away the 3rd letter, it is still the same. You can even take away the 5th, 3rd and the 1st, at the same time!!!!!!!!

Question: I have a large family. I have just as many brothers as i do sisters. Each of my sisters has only half as many sisters as brothers. How may brothers and sisters are there in my family all together