How can a man go eight days without sleep?

What is both possible and impossible at the same time?

Who can jump higher than a Mountain?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

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

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

When can we add 2 to 11 and get 1 as the correct answer?

what does this picture(rebus) riddle means ?

Name a key which is hardest to turn.