Job reference

Hmkay, this is kinda urgent.

My mate has put me down as a reference for a job, i can't get hold of him right now, what sort of stuff will they ask me?

The job is in a care home for an old peoples home.
Thx

Na, they know he didn't work for me, but he doesn't have much previous work experience (that didn't end bad anyway) I'm just like someone that has known him for a while kind of thing i guess.