Heya Dave -,
Again, without knowing the subject/course it's difficult to give advice on how to design exam questions. But I'm going to tag in @kmeeusen as a long time instructor and admin for various courses and Canvas expert. And I also recommend Quiz Settings to Maximize Security by @kona .
In general though, you could do some sneaky tricks but I do not recommend it:
Personally though, I like questions that the student has to review the "lecture content" in order to get the correct answer. I usually put instructions on the quiz page letting users know to leave the quiz page and then resume the quiz when they return.
Stay healthy,
Cheers - Shar 
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