Scores can be assigned to question choices. These scores are than tallied as the survey respondent answers questions in the survey, and can be viewed in Analytics.
You can also give respondents instant feedback of their total score by inserting a Score Display question type into the survey.
For example, in a quiz, correct answer choices could be scored as 1, while incorrect answer choices could be scored as a 0. At the end of the quiz, a Score Display question type could be included and the respondent would see how many correct answers they submitted (their overall score).
Here is a great overview of this option:
For the documented version, click here.