They're using some pretty reasonable questions, to the extent there is a 'reasonable' here. But note this:
7. Do you think the word "on" rhymes with "dawn" or with "don"?There's a widespread fourth option they don't note: For some Southerners — and it's VERY salient to people here in the Upper Midwest — on rhymes with Doan, so with tense long /o:/ rather than either of what people think of as the low/back pair. They've got tons for Southern in other parts of the quiz, so maybe they skipped it.
- Well, I don't think don and dawn sound any different in the first place so on would obviously rhyme with both