1.

Q. I am tall when i'm young and short when I'm old. What am i?
A. A candle

Q. what month of the year has 28 days?
A. all of them

Q. what goes up but never comes down?
A. your age

Q. what gets wet while drying?
A. a towel

Q. the more of this there is, the less you see. What am i?
A. Darkness

Q. what can't talk, but will reply when spoken to?
A. an echo

Q. what is black when its clean and white when its dirty?
A. a chalkboard