They can always book time with you, send an email/IM, etc if there's something they can't resolve on their own.
You have your own deliverables and being interrupted every 10 minutes with inane questions that a web search or a look at the internal wiki/KB would have resolved is not a productive use of anyone's time.
Also, forcing them to wait produces better quality, better researched questions as hopefully they should make some attempt to resolve things on their own.