If eleven plus two equals one, what does nine plus five equal?

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?

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

Who always enjoys poor health?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

I am white when I am dirty, and black when I am clean. What am I?

What do you answer even though it never asks you questions?

Only one colour, 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?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Solve below rebus puzzle?