Can you play percussion on electric guitar?
The most versatile technique for getting a percussive sound from a guitar string is by picking it very aggressively, either with your finger or a pick. Pulling the string outward from the guitar's body a bit when picking it will cause it to slap back into place, lending a sharp, percussive sound to the note.
Can you practice electric guitar silently?
With electric guitar, you have the advantage of being able to practice quietly, as the instruments themselves make very little noise. Plug them into an amp with a headphone socket, or into a computer via an audio interface, and you can jam without disturbing anyone.