To cock a gun means to load it sort of. Like, when you hear guns go like -chk chk-. When you cock a gun, you are placing the hammer in a position to fire the weapon.
Cock it? I think you just shoot until it runs out.
You only have to cock it if it is a spring gun.
Mechanical noise
As you pull the trigger.
sear
May be a hammer or a striker, depending on design of the gun.
A spring gun? It depends on how fast you can cock the gun. There is not a fastest gun.
yes
To make it ready to fire.
As you worded it, it means nothing.
You are most likely low on air pressure.