I'd say it could be beneficial if it was clear what topic the teacher was referring to. For example I just did a full weekend for a course and we won't go back for another two weeks, near the end the instructor laid out what we needed to bring to the next class and said "any questions?" We knew he meant "any questions about these expectations?" This gave feedback to him on whether we knew what we were doing. Otherwise for all he knew we could be going home completely confused.
However, timing is key. If it's time to end the class then everybody will just want to leave for the day and there will be perceived pressure from peers to not ask a question. Likewise, if there's only a couple minutes left I view the question more as rhetorical because there isn't adequate time to have the question answered anyways. In the example above, it wasn't quite the end of class, we still had time for one more group exercise before leaving for the day.
Also, there could be embarrassment issues that can prevent someone from asking a question, especially if it isn't clear which topic the instructor is referring to.
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