What Am I Riddles

Question: (1) What am I and (2) how do you spell it?

Question: Without me you're blind but once you touched in the right place you can turn me on. What am I?

Question: You can not eat me until you undress me. What am I?

Question: I'm not dead i'm not alive, i'm not underground i'm high up in the sky, people speak of me but never saw me. Who am i?

Question: Something longer than a camel but shorter ever than a Cup?