What number when divided in half becomes zero?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Solve the puzzle by telling what does below picture means.

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

You are driving down the road in your car on a wild, stormy night, when you pass by a bus stop and you see three people waiting for the bus

An old lady looks as if she is about to die.
An old friend who once saved your life.
The perfect partner you have been dreaming about.
Knowing that there can only be one passenger in your car, whom would you choose?

Who is that with a neck and no head, two arms and no hands? What is it?

Why do we preferably have round manhole covers and not square ones?

You can see it everyday, But cannot touch it at will. What is it?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

The dirtier I get, the whiter I look. Who am I?