I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

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

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

What occurs twice in a week, once in a year but never in a day?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'