Why is a river so rich ?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

What can go through glass without breaking it?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Bay of Bengal is in which state?

Can you find out the remainder when 3^300 is divided by 5?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?