It depends. Only a few states require registration and there is no federal registration. In the few states that do require registration, the laws vary, so you would have to check local state laws.
No.
yes it does. :)
No, it does not.
Where are you? Most U.S. states do not require registration.
Since the state of Texas doesn't require handgun registration, the answer is, zero.
The short answer is, you can't. The longer answer is, handguns aren't registered in most of the U.S. States, and in the few states that do require it, the information is not available to the general public.
It depends on what you mean. If you legally possess the handgun, then it is legal to have it in Tennessee. Tennessee doesn't require any kind of registration, however, you do have to have a valid handgun carry permit to legally carry it on your person or have it accessible in your vehicle.
It depends on where you are. In the U.S. only a few states require registration and there is no federal registration.
No.
They can forbid you to possess any firearm.
None of my guns are registered in Ohio, but I don't live or visit there, so there is no penalty at all.
I don't know about California, but in most states there is no official gun registration. You can carry a handgun in California if you have a California handgun permit, but I understand those are hard to obtain in some counties.