Which is faster, Heat or Cold ? Explain.

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

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

What is both possible and impossible at the same time?

If 1+9+8=1, what is 2+8+9?

Count the squares in the matchstick puzzle below?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?