I found a nice article at jasoncodes. which helped me to solve my problem about the query paramaters in url..
If you use FeedBurner for your feeds, then it has a feature which integrates with Google Analytics to tell you how many of your hits come via feed readers. This is rather useful because feed readers typically don’t pass any useful referrer information (especially desktop clients). This tracking can be enabled by ticking the “Track clicks as a traffic source in Google Analytics” option in your FeedBurner account.
However, this comes with a disadvantage to those of us who care about clean URLs.
It pollutes the urls like this: