This thread is lol...
The questions are indeed not enough to prove one's intelligence. I think one of those online psychometric tests would've been a lot better to test intelligence.
Forgive me for saying this and no offense to anyone, but... after seeing the test results for question 1, I believe its fair to assume that even less people will actually know that the "square root of 81" and "81 to the power of a half" means the same thing.