Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

If eleven plus two equals one, what does nine plus five equal?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

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?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Aman has 1.15 rupees in his pocket. There are a total of 6 coins in his pocket.

When his friend asked him for a change, he could not give change for a rupee and five paisa.

Can you tell which coins he has?

I make two people out of one. What am I?

How can you leave a room with two legs and return with six legs?