If some one clicks on ads of a site repeatedly, is there any possibility of account termination from adsense . is there any methods to avoid repeated clicks from same IP.......
You could probably find a way with javascript to detect multiple clicks on a given <div>. If that happen, send a request (with the Ajax stuff) to your web server to log that into a database, and don't serve more ads to that user. But if someone wants to harm you... whatever you do...
If you see any bad activity in your site, report it to adsense at once. google.com/adsense/support/bin/request.py?