Final answer:
Internal consistency is the most likely measure being assessed when repetitive questions appear on a questionnaire.
Step-by-step explanation:
When repetitive questions appear on a questionnaire, the most likely measure being assessed is internal consistency. Internal consistency refers to the degree to which different items on a survey that measure the same thing correlate with one another. In this case, if the same questions are being asked multiple times on a questionnaire, it allows researchers to assess the consistency of responses within the questionnaire itself.