Find the hidden tiger in the given optical illusion ?

What does a man do only once in his lifetime, but women do once a year after they are 29?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

Imagine you are in a room with no windows or doors. How will you get out?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?