You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

Can it be possible to build a house that has all its four walls facing towards the South?

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?

Why do you find that most of the buildings are deprived of the 13th floor?

A Monkey, a squirrel, and an Eagle are racing to the top of the mango tree. Assuming all these animals are in perfect shape, Which animal will reach to Banana first?

Buy me, smell me or deliver me, I do not change.

Who am I?

What runs around the whole yard without moving?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.