Following the reference:Saf-C 1005.01 Knowledge Examination: Description.(a) The knowledge examination shall consist of up to 50 multiple choice questions designated by the director, according to the class of driver license(s) requested by the applicant.(b) Each question shall have multiple answers, only one which is correct.(c) Each question shall focus on the New Hampshire motor vehicle laws according to the class of driver license(s) requested by the applicant.

Which one can probably take to mean "anything under RSA 265 is fair game" since there aren't many rules of the road specific to mopeds (the "no riding motorcycles sidesaddle was a minor surprise, although it makes sense).

Other than that, there only seems to be the generic stuff at https://www.dmv.nh.gov/drivers-licensenon-driver-ids/driver-licensing-testing-requirements