While I agree that there are usually a certain set of intelligences ( In the HR world we usually refer to them as Talents – everyone has one or more dominant talents that enable them to be good at one or more professions), I think a general intelligence test is not completely useless. An IQ test is scientifically designed to check the basic levels of all the above intelligences and gives a reference point for people.

most tests check a variety of capabilities. so it has little to do with what psychologists say (or have been saying for donkeys years) and more to do with our perception of intelligence.