I said earlier that I would try to answer all of your questions, no matter how silly they were. betterthanyou456 asked, "What is a serious question?". So, I googled it!
Here's the definition I came up with:

Solemn or thoughtful in character or matter when using a sentence worded or expressed so as to elicit information.

Information from Google and Dictionary.com

Thanks betterthanyou456 for asking!