i placed my adsense ads on my blog but i m curious that google might block my blog...there are ads on the each bloggers free blog in the bottom ...are these ads by google? here you can see the both of the ads http://shahbaz-khan.blogspot.com
Not really sure what you mean. I don't see any ads on the blog other than the ones you probably placed there on the side bar?
there are ads on the bottom of the window when u scroll down the page then ads remain on the window ...not moving with the page!!
I only see that bar there on http://pkblogs.com/shahbaz-khan, and that doesn't seem to be a google ad, and it doesn't even really seem contextual.
Look in your template, file, I bet the author added it as free advertising. You can keep it if you want, its not against TOS.