Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

What goes up but never comes down?

Why Aeroplane windows are round?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

There are a hundred statements.

First person says: At least one of the statements is false.

Second person says: At least two of the statements is false.

Third person says: At least three of the statements are false.

Fourth person says: At least four of the statements are false.

..

..

..

Hundredth person says: At least a hundred of the statements are false.

Analysing it, how many statements do you think are false and how many are true?

How is a fly different from a mosquito?