You can be arrested for possessing a illegal firearm.
Depending on circumstances, everything from a fine to the death penalty
no they can't
No.
Only if you legally possess the firearm in accordance with federal and state laws.
carrying a firearm w/o a license
Chamber empty in a retention holster
In most cases, self defense.
Jail is one, if you are not in compliance with applicable laws.
No
You can find a complete guide on laws governing firearm in PA on psp.pa.gov/firearms-information/Pages/Carrying-Firearms-in-Pennsylvania.aspx
Indiana does not have gun registration. If you're carrying your firearm in the legal and prescribed manner, there is no requirement for it to be registered.
Not enough details to answer your question. If you're carrying a loaded firearm in a legal manner, and in legal possession of it, there'd be no charge.