Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

The more it dries, the wetter it becomes. Can you tell what it is?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

Which is the correct shadow of the bird?

Can you count the number of lines in the below picture?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

What can you see in the middle of March and April that you can never see in any other month?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?