If you answer a knowledge check question incorrectly you will be notified that your response was incorrect and the correct response will be indicated. Sometimes there will be additional feedback for your chosen response. On completion of the quiz, you will arrive at the Quiz Results screen. Your score will be shown along with a comment that you are not yet competent in all the objectives.
At this point you can click the "Take Again" button to take the Knowledge Check again or review the material in the topic and return to the Knowledge Check at a later date.