#1
I know classical guitars have nylon strings. G. B. E are all very easy to tell they are nylon. However E A look like steel to me. I learned from an online source that D is made of nylon wrapped in silver. So what is E and A made out of, Im a bit afraid my guitar may bend due to tension, since I don't believe most Classical guitars come with a metal rod in the neck.
#4
No.
What makes you think this is dangerous?
Classical guitars have used steel wound nylon for a great deal of time now.
If said strings were steel core then you would have a problem.