Is using other's survey questions verbatim considered a plagiarism I liked the questions on various surveys I examined. Rather than paraphrasing, I want to copy some of them directly, and use them in my survey, which is required for my dissertation.

What do you suggest to me, should I cite them or put in quotes, which I believe would be too awkward.
Perhaps, it's somewhat dependent on the field, but, AFAIK, in social sciences this situation is very typical. Nobody places questions in quotes, of course, however, a set of questions (questionnaire), which is usually referred to as an instrument, is cited. Such an approach is usually applied, when researchers use some reasonably well-known or validated instruments, or, at least, the ones from peer-reviewed studies. They are placed in appendices and are cited, based on guidelines of the publication style used in the paper in question.