Questions might be along these lines:
Emergency priorities: lost hiker vs dog off leash vs arterial bleeding - which to handle first?
Heat emergencies - treatment for heat exhaustion vs heatstroke
How do you handle campsite quiet hours complaints?
When do you give a warning (1st time offender, not a blatant violation) vs a citation?
What do you assess first in responding to any emergency? (scene safety)
What do you do in any enforcement contact after assessing scene safety? (identify yourself as a park ranger)
That's all for now - more as I think of them.