What goes up but never comes down?

Count the number of lines in the image below ?

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

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Who always enjoys poor health?

How is the moon similar to a dollar?