It is possible, however "not preferable" is drastically understating the seriousness of it. If you put the wrong caliber cartridge in a handgun, you can possibly damage the gun and/or hurt yourself, so it isn't "not preferable." INSTEAD, it is a really, really bad idea that you should never try.
Not going to work. The .22LR cartridge is longer and skinnier than the .25 Auto. It is also a rimmed cartridge (the auto is semi rimmed) and is a rimfire cartridge- the firing pin strikes the EDGE of the cartridge. The .25 Auto is a centerfire cartridge- firing pin hit primer in the center of the cartridge face.
No
burning bullets is an ability that only soldiers can use
It depends on where you are. There is no national handgun registration and only a handful of states require it.
No it can only fire 22 caliber pellets not bullets.
The handgun was the only firearm he had with him.
The anti-zombie sword is the only anti-zombie weapon that cannot run out of bullets.
According to federal law, you can only purchase a handgun in the state where you reside. You can, however, pay for a handgun in any state, and have that dealer or individual ship the handgun to a dealer in your state, and then go to that dealer to pick it up.
It is preferable to use wood instead of foam boards when building a house because it keeps the house more stable while it is under construction. Also, if foam boards are used it is possible to break into a house using only a sharp knife.
Only if you have a legal license
To my knowledge, only if you have a permit you can.
If it's a felony, no. If it is a misdemeanor, yes. The only misdemeanor that disqualifies you from owning a handgun is domestic violence.
Only for ILLEGAL possession. In some jurisdictions anyone over 21 can possess a handgun. In others, almost no one can have one.