Oh! I thought the answers will get deleted too. I have noticed some of the closed questions disappear, am not sure if it is because whoever asked the question decided to delete it themselves or if it was the result of some clean up job done by the moderators.
Very few closed questions are actually deleted. I believe the policy roughly is they're deleted only if deemed spam. But closed questions tend to be more difficult to find on MO. One way to look for them is to click on "tags" and do a search for the"tag-removed" tag.