I recently interviewed for a role whose core function was to create designs for buildings. The interview panel consisted of engineering doctorate holders. All the questions were centered around the engineering side of the building design. After an hour in the interview, I said the following statement to the interviewers;

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> Pardon me, but I feel that you have completely digressed from the interview. I have applied for the designer job, whose core function is to create building designs while all your questions until now have been related to engineering side (*asking for technical or algorithmic based responses*). And I fail to understand, how such questions can be used to judge my abilities or thought pattern? I can answer such questions but then I'm afraid, if the responses that are incorrect can be used against my application for this role. So I think, it'll be best if I'm judged basis of the job description I applied to.
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I had a feeling the interviewers were not expecting me to say this upfront to them. Because, basis of their subsequent response, I felt they were caught off-guard.

So now, I want to ask the community the following questions:

1. Is it okay to tell the interviewers upfront that the questions they are using to learn more about me are incorrect or out of context?
2. Why do the interviewers ask Questions unrelated to the job position advertised? Is there a sinister agenda in the backdrop, specially when they categorically point out something written in your resume and try to relate it with the *incorrect* question they are asking?
3. Rather than the traditional Q&A based interview, is it okay to request the interviewers to follow a scenario-based conversation as a means to get to know the interviewee better?

Please note, I have 5 years of experience in this area. I'm looking for a canonical answer which explains to me how to **professionally sideline or tackle** (sorry for the lack of better words) such questions for future interviews. This way I'll be better prepared.