What is both possible and impossible at the same time?

What does the below rebus riddle means?

What has one eye, but can’t see?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Out of four images which one is the odd one out?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

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?

A farmer and his neighbour once went to Emperor Akbar"s court with a complaint. "Your Majesty, I bought a well from him," said the farmer pointing to his neighbour, "and now he wants me to pay for the water."
"That"s right, your Majesty," said the neighbour. "I sold him the well but not the water!"?
The Emperor asked Birbal to settle the dispute. How did Birbal solve the dispute?

What does this Rebus Picture mean?