Then there are NO objective measures of intelligence. Nice deconstructionism.
They're measuring something, and the something is not just a random "whoops, I scored well by accident". For multiple choice, there is a chance of scoring well by accident, but taking more than one intelligence test would burst that particular bubble.
What an IQ test actually measures, of course, is how good a person is at taking that particular test.
Different tests vary significantly in how these results correlate to actual intelligence.
I’ve always thought the, “No way to measure intelligence” crowd to be kind of amusing.
Very few people will deny that there is something we call intelligence, and that some people have more of it than others.
As with just about every other human characteristic, we can therefore expect it to be distributed on a normal bell curve.