What seven-letter word has hundreds of letters in it?

Which alphabet letter is a question?

What kind of storm is always in a rush?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

What country can make you shiver?

Prove that the below maths equation is true.

8 + 8 = 91

Why is a river so rich ?

What time is it when an elephant sits on a fence?

What always comes into a house through the keyhole?

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?