Most likely it is the source of traffic rather than "jobs and careers." I am assuming that a lot of US job sites would be showing up in adsense. Just a thought....
Hello Mr.Ravikumar, pls read all the replies here and most of them asking for your URL and why are you hiding it? Even do you believe you have something problem with the TOS... if you need more help then show us your website...
All Google are saying is that your website is not the the type of website that they think can succeed in the AdSense program. I wouldn't worry too much, Google isn't the only way you can make money from your website. Google even send these types of e-mail to people who are making substantial amounts of money. I would just hold your head up high and find another profitable program (there are plenty out there).