What I would do is to start by expanding out the controller to do your troubleshooting; and then insert a
breakpoint just before returning the value so that you can see exactly what is being returned.
public ActionResult CQuestions() {
List questions = new List<interviewquestions>();
using (UserAccountContext userAccount = new UserAccountContext()) {
questions = userAccount.InterviewQuestions.ToList<interviewquestions>();
}
return View(questions);
}