I was just reviewing the NAR L2 test pool, in preparation for giving the test to a NIRA member. It's been a long time since I've looked at the questions. I was surprised to find several wrong answers, and several answers are now incorrect as a result of the recent safety code changes.
I've forwarded the list of corrections to Carl Tulanko, but here they are in case any one else is giving or taking the test:
A15) There are HPR motors with less than 160NS total impulse. The G33 and G75 are current examples, in the past the F101 and G125 were others. A motor can be HPR because it's over 160NS, because it's over 62.5g propellant, or because it's over 80N Tave.
A23) same issue as A15
C3) Answer C is no longer true as a result of the recent changes. The answer depends on the motor size being flown, and is now the same as the safe distance: 100' for an H, etc.
C4) same issue
C9) Technically correct, but bad question. The reality is you redefine your field to be that part of the field that does not include the house, then launch at least 1500' from the house.
C21) Aliphatic resin based glues (yellow glue) is just as good or better than epoxy if the materials are paper and wood. They are MUCH better than 5 minute epoxy.
C22) Same as C21. 5 minute epoxy weakens with heat about as much as hot melt glue does.