About 1st example- that question is not about the very first chunin exam we see in anime but the Konoha-Suna joint exam, later on ,where first part was written test and examiner was Shikamaru http://naruto.wikia.com/wiki/Ch%C5%ABnin_Exams That question is missleading because there's no clear information about which exam it is.

About 2nd: Pain path's Tendo nature is lightning but Yahiko was using Water, Fire and Wind releases in anime (with water being his main nature it seems), not really Lightning.