The example question is sum all the even numbers in a list.

This is something that someone familiar with a language should be able to do as naturally as answering "tell me about yourself" or some other non-coding question. (Personally, way more naturally, nothing makes me more uncomfortable than "tell me about yourself")

I agree that for something more involved, nerves can become more of a factor, certainly any "trick" question, but these seem more like just checking if whatever language is second nature, which it should be, not about algorithms etc.