A simple IQ (Intelligence Quotient) Test | Online IQ Tests for Free and No registration Free IQ test is a psychological test that measures the thinking and reasoning process of your brain. After the test, you are given an IQ(Intelligence Quotient) score, which indicates your unique intellectual abilities and potential. IQ tests are often used by psychologists and clinicians of all disciplines, as a way to measure intellectual prowess, brain degradation, or responsiveness in patients.