No, just keep it safe.
Yes. The gun powder is contained in the shot shell.
inside a locked gun cabinet
Guns did not exist back then.
It's not necessary but it doesn't hurt. If you don't want anyone else to accesses it, then a locking gun cabinet will secure your gun. I own over 50 different air guns, Not Air-soft guns but air guns and rifles. Some of them are capable of firing a 45 caliber pellet at over 800 feet per second. Some of them are very expensive. So I own several gun safes to store them. When it comes to guns, safety is always first.
Inexpensive "working" gun.
Your question is a oxymoron. Pneumatic BB guns are single shot. Machine guns are Multi shot. There are several C02 driven BB machine guns
All guns should have the information stamped onto the barrel. Most of the time it is near the action. Look on the barrel of your shot gun and it should tell you the make, model, caliber (or in your case with a shot gun) the gauge, for shot guns the size of shell the gun takes, and finally the choke the shot gun has. If it is a screw on choke it should saw on it.
Blue Book of Gun Values might have an answer.
Most flare guns are single shot.
Yes, it can any gun for that mater will.
I only know 3 guns that are named after Animals these are: Red Hawk Elephant Gun Snake shot
Yes. Not highly likely, but people have died from being shot with air and gas guns. These were cases of the classic "unlucky shot". First rule of safe gun handling- never point a gun at anything you do not intend to destroy. That includes pellet guns.