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To take a quiz, click the "Master Node" button on the article. It should open a pop-up containing the quiz.

The percentage of correct answers must be greater than or equal to the passing rate to pass the quiz. For example, if there are five questions in the quiz and the passing rate is 80%, you must at least get four answers correct (5 times 0.8 is four answers)

Yes. It varies depending on the type of questions and the complexity of the topic.

The passing rate varies per node. You can view it on the introduction screen when you launch the quiz app.

The number of questions varies per node.

Yes, you can! You can always retake it even if you have yet to take the quiz, failed, or succeeded in passing.

No. You only need to succeed once to mark a node as mastered.

If you believe something is wrong with the question and answer, you can refer to this article to report it.