how many questions do you get on each topic in the geography exam for leaving cert ?
It depends on the topic. Some topics such as "the Sea" or "Rivers" as well as the option topics are guaranteed to come up every year while other topics only come up every couple of years. The best thing to do is to check out some of the full past papers available at http://www.studyclix.ie/Subjects/Leaving-Certificate/Higher/Geography in the central column. Best of luck.