The Wonderlic Cognitive Ability Test™ is used at the NFL Combine as a basic measure of a players ability to learn and solve problems. The test is composed of basic math, logic, vocabulary and English problems. The Wonderlic is comprised of 50 questions that must be completed within 12 minutes. Sample questions from Wonderlic exams can be found here, here, here, and here. Scores range from 50 (perfect score) to 0 (no questions answered correctly). A score of 20 represents average intelligence, or an IQ of around 100. Punter and Harvard Graduate Pat McInally is rumored to have scored a 50.
A list of the top Wonderlic scores can be found here.