Asking a trivial question is a simple way to test a person’s basic skill but also more importantly his ability to communicate and work with others who may not have the same level of expertise.
If you use it as a chance to make a mockery of the interview process/interviewer then perhaps that is not a good idea if you actually want the job.
If you use it as a chance to make a mockery of the interview process/interviewer then perhaps that is not a good idea if you actually want the job.