I throw real life problems I've run into (and fixed!) at people and ask them to give me things they would do to troubleshoot, and compare it to what I did. Always nice when somebody suggests something new.
I also ask 10,000 foot questions. "Say you're wanting to build a new app that behaves like Instagram. What's your hosting platform, your technology stack, and explain why?".
I also ask 10,000 foot questions. "Say you're wanting to build a new app that behaves like Instagram. What's your hosting platform, your technology stack, and explain why?".