In the original link, I didn't see any claim that Edison was looking for correct answers, or that Edison knew the answers. Only that he looked at the paper for a bit and then dismissed the candidate.
For all we know, he was looking for people who deliberately ignored some subset of questions as irrelevant, or who demonstrated some quality of judgment such as questioning the appropriateness of the quiz verbally before starting, asking to take it in a quieter environment away from the arguing people, helping mediate the argument instead, stopping and asking for their first few answers to be checked to see if there was any point in them continuing, or ... anything at all, really.
For all we know, he was looking for people who deliberately ignored some subset of questions as irrelevant, or who demonstrated some quality of judgment such as questioning the appropriateness of the quiz verbally before starting, asking to take it in a quieter environment away from the arguing people, helping mediate the argument instead, stopping and asking for their first few answers to be checked to see if there was any point in them continuing, or ... anything at all, really.