I suspect that any "conscientiousness, benevolence, and loyalty" test which is both as accurate and as easy to administer as an IQ test would be much easier to game than the IQ test. And, of course, less conscientious would be more tempted to game it, by lying to themselves and others.
Out of curiosity, I tried this one and easily ended up in the top 10% of conscientiousness by lying to a few questions, but not to too many, to avoid suspicion. There is no way I could game a random IQ test in a similar fashion, however.
Does anyone know of reliable tests of personality traits other than IQ?
Well, personality surveys can get away with using blatantly loaded questions because there's not much motivation to lie on an anonymous survey (though it's not exactly unheard of anyway, and there are issues of self-image vs. behavior to consider). This obviously wouldn't fly if something like college admissions or a job application was riding on the results, but I'm not going to condemn the existing tests for failing outside of the domain they were designed for.
I can't think off the top of my head of any good ways to measure conscientiousness in such an ...
I've never heard of anyone saying "I thought that person was really intelligent, but they turned out not to be", and when there are scandals about people with fake credentials, they don't seem to come from people with fake credentials making mistakes-- instead, someone checks the history.
It seems to me that you can find out a lot about people's intelligence by talking with them a little, though I've underestimated people who were bright enough but didn't present as intellectual.
The real problems are with identifying conscientiousness, benevolence, and loyalty-- that's where the unpleasant surprises show up.