Questions need to give any legit fisherman the oportuntiy to join so don't make it too US centric - I've been here 11 years and would struggle with one or two of those
If you were looking for something automated, a multiple choice approach might work:
i) How many States in the USA? a) 44, b) 48, c) 50, d) 66
ii) Which has the biggest population? - a) Scotland, b) England, c) Wales
iii)
Fly is to
Flyrod as
Plug is to - a)
Lathe, b)
Reel, c)
Spinrod
The more questions, the less chance of an automated spammer getting a "pass mark".