Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

Why is a river so rich ?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

Four children having five rocks each were playing a game in which they had to throw the rock at a particular solid area in the water. Child 1- Succeeded in throwing three rocks at a solid area but one of the rocks sunk. Child 3 - His aim was so bad that all rocks got sunk. Child 4- He was awesome and none of the rocks got sunk. Child 2 - Was the winner but was struck by a rock in the head and died. Who killed Child 2?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Can you name an animal whose killing cannot be performed without spilling your own blood?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?