Yes. An Electric Piano; there is such a thing.

A keyboard is electric

A piano is non electric

um...look up electric piano on google...

An electric piano is played the same way a regular piano is played only you do not have to use as much pressure when hitting the keys. You have more options for creating different sounds with an electric piano.

Depends how high and hard you crank up the electric piano. Also depends on what kind of pianos they are. But acoustically a normal piano will have the same volume if not more than an electric one.