The imagery is public property
A freighter with an asymmetrical cockpit, a domed astromech droid, a desert planet with two suns, a glowing blade: these are recognised by people who have never watched the films, because they have been absorbed into general visual culture through parody, merchandise and forty years of reference.
That is why a franchise quiz this dense can sit at Medium. A great deal of it is not really fandom knowledge any more.