Good Riddles

Question: What demands an answer, but asks no question?

Question: I am taken from a mine, and shut up in a wooden case, from which I am never released, and yet I am used by almost everybody.

What am I?

Question: Everyone asks for me but yet everyone hates to face me ,for someone I am agony for others I am relief! Who am I?

Question: "The Captain is my brother," testified the soldier. But the Captain testified he didn't have a brother. Who is telling the truth?

Question: Why did the chicken cross the road?