Logic Riddles

Question: I am two five letter names 500 is at the start, 10 is in my heart. In the middle of that is 1, Near the end is none. At the end is 14, Yet that is not all that has been seen. It's a word that rhymes with liver, Yes, to the left of that is river.

Question: What comes down and never goes up?

Question: A dad and his son were riding their bikes and crashed.They were carried to hospitals.And the doctor who looked the son told "i will rescue u because u r my son.How is this possible?

Question: If all of your surrounding is X, you can't Y. X n Y have the same letters. Name X n Y.

Question: You are participating in a race. You overtake the second person. What position are you in?