Needless to say, this is a bad thing. Don't do it. Either way, your post will get routed at random to one of the active co-moderators, who will decide whether it is acceptable or not. This means that every time you post something, you should either see it appear on the newsgroup or receive a rejection letter. If neither of those things happens, something has gone wrong with your post.
Confusion occasionally arises about crossposted articles.
When a moderator approves a crossposted article, the article is posted to all of the groups on the Newsgroups line. If a crossposted article is rejected by the moderators, then it will not appear in any of the newsgroups. You are of course welcome in this case to post your article to the other newsgroups, omitting sci.physics.research. Of course, the moderation process is not instantaneous. There may be delays of up to a few days in any particular moderator's processing of submissions.