Each question is weighted equally, defaulting to a score of 1. At this time, that value cannot be changed - so if you have 20 questions, each question is effectively worth 5%.
Additionally, you cannot currently set the pass/fail setting on a course. Normally, this is a value that is set in the LMS (currently, all myUdutu courses default to 50% unless overridden by the LMS). However, we are aware that SCORM allows for setting this value in the course: it will be a value you can set in myUdutu in the next major update (planned for the end of March). If your LMS does not support setting this value, you can faithfully assume that myUdutu will soon allow you to configure the default setting.