When I did it I got a question that was something along the lines of "you are flying in controlled airspace, you have been told by ATC to maintain a particular heading and altitude. You have not heard from them for some time and you know you are flying towards high terrain - you have 30 seconds to explain your concerns to ATC".
Cue a 10 second explanation by me which was significantly wordier than anything you would possibly say in real life - now what to say for the next 20 seconds? I mean seriously, they expect you to talk for 30 seconds on something as simple as "confirm you want XYZ to maintain present heading and altitude?". Seriously.