the correct translated adjective is "arab", "arabic" is not used to describe a group of people—it is the language
Why not: "Are the engineers Arabs or Turks?"
Wrong correction: "arabic" is the language, "arab" is the person.
I think one could use tge plural Arabs or Arab equally
You'd have to match "Arabs or Turks" or "Arab or Turkish". (Although the Hungarian uses the noun form)