Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

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?

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

What can you serve, but never eat?

What is represented by this BrainBat Pattern?

EST EST EST EST

Bay of Bengal is in which state?

Which letter of the alphabet has the most water?

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

Why are televisions attracted to people?

What is the fastest way to double your money?