Why is Saturday stronger than Monday?

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?

What has a ring but no finger?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

What part of Turkey has the most feathers?

There are forty elephants and they have forty-fore heads. How can this be possible?

I am sure no one can have two things for dinner. what are they?

What kind of tree can you carry in your hand?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

What does an Island and the letter T have in common?