Not with a common pellet gun (No) However if you are serious than there are a few, Very Few, Air rifles that can bring down a large animal. These rifles are in the PCP class of air rifles. (PreCharged Pneumatic) They must be pumped to 3000 PSI and some are designed to shoot a 50 Cal ball or slug. This is capable of bringing down very large game. (See the link Below)
No, a pellet gun can't kill a bear it will only make it angry. There for it will eaither attack you or just ignore it.
No! And for those that think the bear will ignore it I'll just say this. If you are OUT OF YOUR MIND and use a pellet gun then the bear WILL NOT, I REPEAT, WILL NOT IGNORE IT! IT WILL ATTACK! Therfore the only out come is it will charge you while you are reloading your precious single-shot pellet gun and will have you for supper. If you are hunting deer or elk with a pellet gun then you can kill one because there are high-powerd pellet guns out there that are proven to kill medium game...BUT NOT LARGE GAME!
Yes
It is passable to kill a cat in the right situation.
No... Corrected answer.-------------- It depends on the caliber and power of your Pellet gun. But Yes it is possible. In fact many pellet guns and rifles are used for rodent control.
Yes
If you are talking about a PCP (PreCharged Pneumatic) rifle. With a .45 caliber pellet, then "Yes" It can. I don't believe there is a 40 Caliber pellet gun.
Yes. Under the right circumstances.
It is possible, Yes, But it depends on the caliber, Weight of the pellet, the FPS of the gun. I suggest using a Pellet rifle not a pellet gun. I suggest a head shot using hollow point pellets. Also a license may be required to hunt the goose
Depending on where you live and the local law. Yes a pellet gun will kill a squirrel. I suggest you use "Hollow point" hunting pellets.
Yes or any small rodent.
Given the right set of circumstances, yes.