Find the value of "?" in the ball picture Riddle below:

What always comes into a house through the keyhole?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

I am white when I am dirty, and black when I am clean. What am I?

Which is faster, Heat or Cold ? Explain.

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

What has a bottom at the top?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

Why Wine Glass Stem is so long?