Why? Is pop quiz ability important for the job? I'd rather of prepared candidates. If it's technical questions they'll still need to work through the problem because showing their process is the important part of a technical question.
Anything else the employee is just going to Google if they don't know it, or it's a personal/goal type question which again preparation is better in my opinion.
Anything else the employee is just going to Google if they don't know it, or it's a personal/goal type question which again preparation is better in my opinion.