I wondered about that too. The whole exam looks like it was translated by a bored 2nd year English student. . .who somehow got confused about the difference between diodes and coyotes.
(And before anybody thinks I'm just dissing non-native English speakers, yes, I have been there and done that. I know learning another language isn't easy, which is why I wouldn't try to write an exam in a language I do not really understand without asking for help).
Torben
[Edit: Question 4: Think about this one. What is opposite of "insulator"? And what might a material which is something between an insulator and its opposite be called?]