https://jacksonloper.github.io/datasciencequestions/ is a collections of questions about data science topics, targeted towards the introductory masters level. They are pretty short (more like something for a quiz or exam, less like a homework problem). They are designed to be somewhat "gradeable" (i.e., most of the questions have one answer that is objectively right). Maybe they will delight you.
Repo holding all the questions is at https://github.com/jacksonloper/datasciencequestions.
If you have ever taken or taught a masters-or-higher data-science course, feel free to submit PRs or issues to the repo. Please include your background when you do so I have a sense of where you're coming from. I would love to add as many questions as possible! So if you have a question that you think intro-level masters-of-datascience students should know the answer to that seems in-scope for what is already there, please make your suggestion (as a PR)! If your additional question doesn't seem in-scope, perhaps submit as a new-feature issue and I'll think about enlarging the scope.