#1- Surface wave is a type of electromagnetic wave
#2- Only transverse
#3- Distance from crest to crest or from trough to trough on a wave
#7- Wavelength is one complete wave cycle
#8- Constructive interference is occurring
#11- In a longitudinal wave, particle displacement is parellel to the direction of wave motion
#15- Does require a medium to transfer
#18- By the pitch they produce
#19- Perceived by the pedestrian
#20- Speed and direction affect pitch
#21- High

I took this same test, those are the only questions i remember though. Hope this helps you! : - )