No You cannot completely delete your page .but delete content information of site and not delete in server of google .
ıf you have deleted pages block the bot with robots.txt then use the Remove URLs tool in Google Webmaster Tools. if your pages live, use "noindex" meta then use the Remove URLs tool in Google Webmaster Tools.
yaa that's right after 1 or 2month google update your all site pages and information after delete that pages this time your page on google server that's why you get your pages on google better is you 301 redirect all pages on index page otherwise on inner page