If such a section was used on a test they described as an "IQ test", it was almost certainly there only for statistical validation purposes.

There have been a number of studies done which ask obviously knowledge based questions, obviously g-loaded questions, and unknown questions. They then compare the statistical distribution of answers to the unknown questions to the obviously bad questions ("who discovered America") and the obviously good questions ("you want to carry a fox and two goats across the river in a 2 seated boat, but if you leave the fox alone with the goat the fox eats the goat..." [1]). If you aren't misremembering, I suspect you were participating in such a study.

[1] This is unbiased because all information is given. You don't need to know what a fox or goat is, or have ever seen a boat. It could be rephrased "you want to transport a X and two Y's from location A to location B. But if you leave an X and a Y alone, you fail."