On assessment screens, the difference is that scored items will report a score back to the LMS (if you use one) and with scored assessments, the learner only has one chance to answer the question and their response is “locked in”. When an assessment screen is marked as “self-assessments” the learner can refresh the screen and try again. These types of screens also display a ‘Show me’ button that the learner can use to have the correct answer(s) revealed to them.
You can select either ‘Self assessment’ or ‘Scored’ in the screen settings.