Answer:
I am useless when together but useful when I am broken apart. What am I?
What is eaten but can also eat?
I am a king who’s good at measuring stuff. What am I?
I'm sometimes white and always wrong. I can break a heart and hurt the strong. I can build love and tear it down. I can make a smile, but more often bring a frown. What am I?
Crooked as a rainbow and slick as a plate ten thousand horses can't pull me straight.
I am a rock group with four members. All dead one was assassinated.