What type of validity is questioned when a test of IQ does not cover all aspects of intelligence?

Content validity refers to the extent to which a test measures all facets of the construct it's intended to measure. In the case of an IQ test, if it fails to address all dimensions of intelligence—such as reasoning, problem-solving, verbal abilities, and emotional intelligence—it lacks content validity. This means it may not adequately represent the full concept of intelligence, potentially leading to an incomplete or biased measure of a person's intellectual abilities.

In contrast, construct validity relates more to how well a test truly measures the theoretical construct of intelligence itself, rather than whether it encompasses every element of the construct. Criterion validity assesses how well one measure predicts an outcome based on another established measure, while face validity deals with the superficial appearance of a test and whether it seems like it measures what it's supposed to, without delving into its actual effectiveness. Content validity is the most appropriate term for the situation described.