I fear there will be some controversy over your decision on a winner of the Lightspeed headset competition (yes, I have just entered with what are the correct(!) answers).
Q2 asks for units for measurement of sound (acoustic) pressure. The correct answer is of course Pa in SI system. And sound pressure level (SPL) is normalised on a logarithmic basis relative to the reference level, p0, of 20 micropa = 2 x 10- Pa, that corresponding to what is conventionally considered to be the approximate threshold of human hearing at 1 khz. This reference level is normally denoted 0 DBSPL (zero decibel relative to p0). So conversation levels correspond to ~50 DBSPL, long term hearing damage level ~85 DBSPL etc. Unfortunately this nomenclature is often lazily written as ‘db’ and not ‘DBSPL’. Or rather the reference level (0db) is not defined (dbs are just relative, not absolute values). Even Pooley’s PPL training manual on Human Performance Factors has this wrong.
I suspect you assumed the correct Q2 answer is dbs. But the question is ill-posed for this; it should have asked how sound pressure levels are measured rather than simply sound pressure.
In the era of Trump, your assumption and wrong answer can be considered populist! POTUS Interruptus knows no more of physics, aviation and engineering than the man in the moon, which is why he is proposing to bugger up the FAA.
Pedantically yours regardless David S James PHD