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I don't think it's cultural bias - it's just that all they measure is how well you do at this kind of test. Some people get anxious, some are sloppy, some simply think slowly. You can't measure "intelligence" (whatever that is) with a number. Beethoven couldn't add, but he could make a piece of music with a complex 9/16 rhythym off the beat. He was so bad at math his metronome marks are meaningless. This is one of the great geniuses of the entire race, and he'd fail miserably a test like this.
In any case, even if you believe in something like this, it 1) has to be timed 2) has to have enough questions to make a valid statistical sample. And why isn't the answer like "100 + or - 10"?