You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

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?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

What always comes into a house through the keyhole?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

When 99 is considered higher than 100?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Solve the mathematical equation in the picture below.

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?