Decapitate me

Question: Decapitate me and all becomes equal. Then truncate me and I become second. Cut me front and back and I become two less than I started. What am I?

Question: What is that thing we buy for eating but cannot eat it?

Question: You build a house and all 4 walls are facing south. Where did you build the house?

Question: A girl dove in the sea.. some say there are two people under the sea. Why is that?

Question: Look at my face, I am somebody. look at my back, i am nobody. What am I?

Question: I have 6 faces and 21 eyes, but can't see a thing. What am I?