It is both exhaustive and mutually exclusive. It is neither mutually exclusive nor exhaustive. It is both reliable and valid. The importance of levels of measurement lies in distinguishing qualitative from quantitative research. Ordinal measures have the properties of interval measures.
Interval measures have the properties of nominal measures.
Ratio measures have the properties of ordinal measures. Ordinal measures have the properties of nominal measures. All are true. The majorproblem with closed-ended questions is the number of items in the questionnaire. It is double-barreled.