Clean riddles

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 it was a blank sheet of paper with a solitary question on it: "What is 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?

You always carry me in your hand, always with you, from your birth till your death! I am a tree. What Am I?

If you had three apples and four oranges in one hand and four apples and three oranges in the other hand, what would you have?

I am a five letter word and very strong. I become single when you remove two letters from me. What Am I?

Which is faster among the two? Hot or cold?

What is the major difference between a lighting and electricity?

What letter is next in this sequence? M, A, M, J, J, A, S, O,__

Divide 110 into two parts so that one will be 150 percent of the other. What are the 2 numbers?

You have two cups. One cup is filled with black coffee and another cup is filled with black tea. Both cups are filled with equal quantity of respective beverages. Take one spoonful of black tea and mix with the cup of black coffee. Then take one spoonful of black coffee and mix it with the cup of black tea. Now tell, me which cup has more liquid in it? Does the cup of black tea has more liquid or black coffee has more liquid?

What is represented by this BrainBat Pattern? EST EST EST EST