If you believe this is a valid, reliable test of one's IQ, then you have obviously never seen, nor participated in a true battery. A research-based, valid IQ battery examines a multitude of cognitive and emotional areas and are examined by well trained professionals, usually psychologists. These tests are very extensive and time consuming. As a special education teacher, I have seen these exams and how extensive they are. A short online version is not going to come close to accurately predicting "intelligence."
And to piggy back on Dudetus' point, the use of alcohol will most certainly effect cognitive ability and how questions are analyzed. There is plenty of clinical research out there which disproves the validity, and reliability, of these online IQ tests. They are fun to take, but to place any significance on the results is not being honest.
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