What happens when a deal is passed out in Duplicate Bridge Tournaments?
I understand how duplicate bridge works, but I'm still missing one small conceptual part of the scoring, being the outcome when a deal is passed out. Is the score for that hand just assumed to be 0 for both sides


Yes. Why would there be an exception? Passing out the hand is a perfectly valid way to play it.


  making it identical to a hand that happened to have a 0 score? 


There are no other ways to have a 0 (raw) score.


  What happens if some tables play the hand and score highly where others just don't play it since they all passed? 


The usual rules for converting score to matchpoints (or team IMPs, if you use those) apply.


  Are certain measure taken in the creation of the hands to avoid deals that are likely to be passed out?


No. It's not a TD's responsibility to speculate on how a hand is likely to be played before play occurs.