Put the videos in a Description item, using the standard Moodle tools for embedding multi-media. Then add the description, and the four questions, to the same page of the quiz.
Quiz
Web page with videos and quiz questions: possible?
གྲོས་བསྟུན་འདི་བསྡམས་ཡོདཔ་ལས་ ལན་གསལ་བརྐྱབ་མི་ཚུགས་