When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Below rebus represent famous DiCaprio movie. Can you name it?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

John was drowned by he was not wet. How?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What do you answer even though it never asks you questions?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?