Logic Riddles

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?

Question: When is... 5>0, 0>2 and 2>5? Hint: Hands