> and then pick out 100 questions that form a Gaussian distribution. This is how IQ tests are created.

You missed an extremely important final step. People's scores on those 100 questions still aren't going to form a Gaussion distribution. You have to rank-order everyone's scores, then you assign the final IQ scores based on each person's ranking, not their raw score.

It would form a gaussian distribution if you pick the questions carefully enough.

If you rank-order scores and fit to the distribution after the fact, the questions are nearly irrelevant, as long as you have a mix of easy, medium and hard questions.