A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Imagine you are in a room with no windows or doors. How will you get out?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

I cannot talk, but I always reply when spoken to. What am I?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

What kind of band never plays music?

Who can jump higher than a Mountain?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Name a key which is hardest to turn.