There seems to be a thing called "competence" for particular abstract tasks. Further, there are kinds of tasks where competence in one task generalizes to the whole class of tasks. One thing we try to measure by intelligence is an individual's level of generalized abstract competence.
I think part of the difficulties with measuring intelligence involve uncertainty about what tasks are within the generalization class.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.