What seven-letter word has hundreds of letters in 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 the longest human nose just 11 inches?

Forwards I am heavy, backward I am not. What am I?

Name a key which is hardest to turn.

What can go up a chimney down, but can’t go down a chimney up?

What do you get if you add 2 to 100 four times?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

What can you see in the middle of March and April that you can never see in any other month?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?