In my department, it's standard to put all research instruments, and research protocol (e.g. questionnaires) in the appendix. Anything that isn't yours (MMSE questionnaire, maps) should include a copyright date, or "used with permission from XYZ".
(Just a thought...don't you find it a bit odd that your prof would say this is optional? When you're reading a research report, don't you check out the questionnaire, etc. in the back of the report? Maybe your prof misunderstood your question?)