While not exactly the same, this situation strongly parallels the long-standing "homework question" situation on Stack Overflow. Of note are the following two principles in their homework FAQ:
- Make a good faith attempt to solve the problem yourself first. If we can't see enough work on your part your question will likely be booed off the stage; it will be voted down and closed.
- Ask about specific problems with your existing implementation. If you can't do that yet, try some more of your own work first or searching for more general help; your professor is likely to be a better resource at this stage than Stack Overflow.
According to the Stack Exchange philosophy, "you should only ask practical, answerable questions based on actual problems that you face." But the actual problem faced should at least be somewhat more complex than "I don't know the answer," which is pretty much a given for any question ever. Otherwise the bar ends up set ridiculously low, the site gets flooded with low-quality questions, and nobody's happy.
Maybe such questions actually come from a real concern or a real roadblock in research, or because of an interestingly complex problem that other experts would appreciate. But without any indication of this in the question body itself, these are wholly indistinguishable from questions which are only asked out of mild passing curiousity with no actual investment in the answer or, even worse, just being too lazy to try.
Our site is currently scoped for an academic interest in Islam, and I think it is fair to expect that questions show at least some semblance of academia, which is to say actively trying to learn. This would exclude most questions in the mild-passing-curiousity and outright-laziness categories, which are liable to discourage actual experts from participating; regardless of intent or import, such questions tend to read as "do my research for me."
Just as a student wouldn't just go up to a teacher and cold demand the answers to a homework assignment (at least, not if he's expecting a useful response), questions on this site shouldn't be encouraged if they don't suggest some willingness to find or work out the answer themselves. Ideally, every question that's asked, even if it's not answered by the community, should have a chance of being self-answered from the questioner's own off-site efforts.
The onus is basically on the questioner to prove that their question is actually worth the time or effort they want the community to put into it. Fleshing out a question is (or at least should be) easy: When the questioner has tried and failed to solve the problem, either due to their own limits or unforeseen complexities in the problem space, simply include those details.
And if the questioner doesn't actually care enough about the answer to work for it, or at least to present a compelling case, why should anyone else?
As such, I feel that the type of low-quality questions mentioned in OP, those which don't suggest anything at all except the fact it's a question, should not only be downvoted, but also be considered off-topic for this site, and closed as such.