What's the only room from which no one can enter or leave

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

You can see three almost identical images below. Can you spot the odd one out from them?

What will you call your mother's brother's brother-in-law?

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

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

Which Travels Faster? Solve below famous picture riddle:

Chhote se Chintu Miyan,
Lambi si Pooch.
Jahan Jaye Chintu Miyan,
Wahan Jaye Pooch.

छोटे से चींटू मियाँ,
लंबी सी पूंछ।
जहाँ जाये चींटू मियाँ,
वहाँ जाये पूंछ।

Bolo kya?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?