What is the word or phrase?

How many letters are in the alphabet?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

Who has married many women but was never married?

There is a place where if I stand up straight, I will still be considered sideways.

When can we add 2 to 11 and get 1 as the correct answer?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits