If you're looking to set a record then there's no answer. Perhaps you could ask a question like, "Can you recommend some cool music for my party?" would get a lot of responses.
If you just want to increase the number of replies to your questions remember that most of us won't answer a question when the answer has already been supplied, so questions with obvious answers are out.
If you ask technical questions your answers will be in single figures.
If you ask questions about TV and the movies you'll do a little better.
If you ask religious questions you'll get responses but many of them will be hostile, especially if your question sounds as though you're preaching, or as though you're attacking somebody's religion.
The same restriction applies to politics. "Why did (Obama / Bush / Carter / Nixon) do such-and-such.
So the only way you're going to get a lot of answers is to ask interesting questions on subjects that allow for differing opinions rather than hard facts.