No that is not possible You can only get a high page rank if you have many incoming links from other domain websites
Yoi get PR from external sites. Even with a billion internal pages, I doubt those can boost you to PR5
No, it's not possible, besides all the internal page will pass some "juice" to the index page, you will need external "juice" to give some pagerank to your domain, so you can get a PR3, 4 or maybe 5 if links from external pages have very good PR (a few PR5 and over)
I disagree, I think you can give pagerank yourself, for example a good linkbait will get you tons of links and traffic to some internal pages and after a few months this page will reach a PR 3 or 4, if you link from this page to only a few pages on your site (index, sitemap, etc) you will be passing some Pagerank to this pages. Remember that pagerank is passed to all outbound links from a page, I don't know a rule from Google that explain that Pagerank can't be passed on the same domain.
But I don't think that is very fair on Google's part is it? It should appreciate good content, not external links
Yes it is possible if some of your internal pages have got good inbound links and home page may not have any
PR is counting for the backlinks, the more you have the more higher your pr is... IT is impossible to give yourself PR here..LOl