How to controll rss feed in D7? Could anyone please tell me that how to control RSS feed in D7, because even without my knowledge D7 has created a RSS feed for my site.eg http://wwww.mysite.com/rss.xml

Even though in that feed my page contents are not selected but some un-nessaary items are selected like News letter, Poll and image jCarousel details. I'm 100% sure that I didn't select these items to generate feed but I don't understand how get it involved. 

Also if I want to select the required page content link to display on the RSS feed how can I do that ?
To default RSS feed page goes for example every node with promote to front page flag set to true.

You can use Views to create your own, highly configurable RSS feeds. If you want even more control you can use this module https://drupal.org/project/views_rss.

You can override default RSS feed with a Views one too