I'd suggest asking a few simple/obvious ones:
- Can you drive and do you have a licence?
- Are you willing to do field work?
Both of which I've seen answered in the negative, which lead to a response of "crickets", after the fellows had been hired and got themselves well bedded in.
Last but not least, we always asked the candidate if they were offered the job would they take it.
Some people go to interviews for practice I guess.
What is an instrument?
What is a man?
What is the difference between a measurement and an observation?
What is 90 degrees minus 180 degrees?
Show me on paper how to add and subtract two HMS quantities.
How dyslexic are you?
Can you read and write cursive?
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Have you ever wiggled in ?
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Wiggled in? Is that the same as bucking in?
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As for questions, you could always take questions from the survey technicians practice exams and work them into the interview.
Wiggled in? Is that the same as bucking in?
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Wiggling in is finding the line somewhere between 2 points and bucking in is finding the line on 2 points extended.
At least that's the way I remember it...
Any candidate for a position in the field here has to pass a rigorous physical. If you pass it there's little doubt that you can swing a hammer.
As for questions; in today's market:
Are you breathing? And do you have a heart beat?

That was my interview back in 1972.