Does Kevin Jonas play acoustic guitar or bass guitar?

He plays neither. I'm looking at a picture right now at this link: http://jonasbrothersfan.com/JonasBrothers/BandBiography/KevinJonas/tabid/262/Default.aspx

He's playing a Gibson Les Paul, which is an Electric Guitar. Judging by what the other guy is playing, Disney is probably sponsored by Gibson Guitars.