i want to know is dummy blogs backlink works?? i mean if i make 10 blogs having just one post and containing my blog link {i.e my orignal blog which hase already have page rank 1 } then will it improve my page rank?
PageRank is based on the number and quality of your backlinks. So every DoFollow backlink you get helps a little bit to improve your PR.
It is a link, so it will definitely count when Google discovers it. However you won't get any great benefit from it.
It will help a little bit, but this strategy will only work in short. You will have to put some effort in making sure your 'dummy' blogs are also considered quality.
10 Non Indexed/Non Ranked backlinks aren't pretty insignificant, but an impact nonetheless. However, if all 10 blogs are hosted on the same IP, Google can penalize you for interlinking your own sites. So, watch out
Your site IP xxx.xxx.xxx.xxx Dummy blogs IP: xxx.xxx.yyy.yyy ---> yes, do it. Dummy blogs IP: xxx.xxx.xxx.xxx ---> no, don't it.