Some questions appear to ask for same explanation/concept, for example about SYNAPSE. Is there any provision for readers on Socratic.org to find previously answered questions on same topic when they submit their query?
You can always search your own question on Socratic. Any time you want to ask a question, and you believe it might be answered already, just enter it into the Search bar and see if it's been answered before.
If it's not, then there's no reason why you shouldn't just ask it.
Either way, there is a way to report identical questions in Edit Question > Mark as Duplicate.
Then, if a moderator sees it and handles it, a question can be redirected to a single question that is already answered.