What is the coolest letter in the alphabet?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

How many bananas can you eat if your stomach is empty?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Why is the Hole below a Lock?