I hate the one about radio-altimeters, asking what you should take into account; I would have thought the distance the equipment is from the wheels, and thus the bottom (or the bit which hits the deck first). However the correct answer is that you need to allow for computing processor times, which I know for a fact are so tiny that is it negligible. My groundschool also have a note asking us to tell them if this question appears, as they want to appeal it. And unsurprisingly, I got the wrong answer :-()
There are a few I come accross, I forget now! Buts its really frustrating