Is a question be unianswerable or multianswerable?

Answer

A question with only one answer has verifiable evidence to prove it is all that it could be. A question with multiple answers would have to be a hypothetical or theoretical question with limited facts for evidence as a solid truth or probability. "if a tree falls in a forest and nobody is around to hear it does it make a sound" is unanswerable due to limited information concerning sound waves, as well as being worded incorrectly to bring about a valid answer. "...does it make an 'audible' sound?" If no one, or nothing, is there to hear it then no, it doesn't. Does it create the conditions, or waves necessary for making sound? Yes. There is simply nothing there to receive the pressure crated by the wave.