Why do we preferably have round manhole covers and not square ones?

What has a ring but no finger?

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

Find the next number in the series below

21 32 54 87 131 ?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?