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There is no any exact figure of keyword count per page. Most of the people suggest it should be 2 to 3%. But I don't agree with this logic. You should focus on audience engagement content. If your content is up to the audience preference, it will automatically pick your target keywords from you content.
My suggestion is just focus on you content quality with target keywords and forget about the rest.
Yes, It's not good for SEO. If you have IIS server then follow these instructions for canonical problem:
http://weblogs.asp.net/scottgu/archive/2010/04/20/tip-trick-fix-common-seo-problems-using-the-url-rewrite-extension.aspx This is only applicable for IIS7 or later server version.
If you have Apache server then check this URL:
David is right. Google just wants to give the ease to users. It's good tactics is you are providing your contact details without harm the content placement.
What should be the ration of inbound link between Home page and Internal pages? And also wanted to clear my doubt, suppose My website is related to Technology niche with different technologies like PHP, Java etc. Is this better idea to submit internal PHP page link in PHP related directories? Although I know that in the most of the directories have very large number of categories.
You can avoid the penalty by intermediate URL creation like Google Ads(Double click URL). It will not pass any juice to your website and your advertisement will also continue.
Otherwise it is great possibility of penalty.
Yes, Its count. I remember once Matt had explained about (-) and (_) in to the URL formation. It means there is something for URL formation. It's also true by logic of search engines.