I heard you can burst a project by asking questions, if they are hiding something they won't be able to answer all questions thrown at them, is this true?
Yes, that's true.
I've read of that before that when they're trying to ask serious questions on the Telegram of that project and the staff there can no longer answer and were likely pissed, they've been blocked.
What questions can one ask a project dev or team to know if they are up to something good or bad?
Just ask the normal and serious questions, there are no specific questions needed. It's just the typical questions that someone is curious of knowing whether they have good or bad plans for the future.