I think as a newcomer you are facing lot of confusion to know the site..Anyhow as said by rajesh cash credits for weblinks is Rs.5 per weblink and per day only 5 links are allowed.it has to be approved to get the cash credits..
Regarding forums you will get cash credits only for contest or daily awards see the awards tab for winners..Daily forum activator is the only one for which you get Rs.25..
Regarding polls you dont have cash credits there but top voter per day is again give Rs.25
Regarding crosswords i think you read the thread and also answered that it is nice cash credit program..
For question and answers you will get Rs.25 for most answered questions only which is selected by maverick based on the geniunity and others..
I hope i am clear..further any doubts just refer the first categories in forums like announcements, contest and rewards..and daily forum activator thread..
If you still need help any one of us can help u.