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

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

Why is Saturday stronger than Monday?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

What can jump higher than a building?

What kind of band never plays music?

Where do fish keep their money?

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

A blonde put eyeliner on her head. Why?