Can you identify if it's a murder or a suicide ?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

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

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Which wheel of car does not rotate when you turn your car right?

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