Ofcourse, i went to preference for Poll and FAQ but there was no notification listed out.
This would suggest that the Poll module does not support notifications (like I said, not all modules do). There is only one notification option in Polls, which is the "Notify when poll is finished".
I haven't had a look at the FAQ module in a while but if you are not seeing anything in preferences for polls then there are none available.
Jensclass's suggestion of using the help is a great way of finding information as this question has been asked and answered (and asked and answered and asked and answered .....).
A great tip is to use google to search xoops. An example for this would be to query the following in google: poll notification site:xoops.org
Cheers.