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Bednobs, I take your point, but in most cases, an "easy" question is one you can answer, and "hard" one is one you can't!!
I am generalizing there of course, I know in Music, which is 'my' subject, I may know something that the average student, or viewer is unlikely to know.
They do pitch those questions at just the right level, ie, I can answer instantly with a big smug grin, while my wife smiles patiently, waiting her turn to obliterate me when History pops up!!