addendum to the last answer:
The Link for the screenshot did work and I already was aware of this function.
It says that: If a user has one wrong answer he/she will get 0 points.
But it seems that it doesn′t work with multiple choice tests, because a “wrong answer” is not the same as a “not selected answer”.
When a question has 4 correct options and only one is selected, the whole quesion would/ should be wrong. But this doesn′t seem the case.