How many intelligence constructs are typically assessed by an IQ test?

• A. 3
• B. 4
• C. 6
• D. 5

Answer: (D)

IQ tests are designed to capture a range of mental abilities by breaking intelligence into multiple constructs. In widely used comprehensive batteries, five major domains are typically assessed: Fluid Reasoning (problem-solving with novel tasks and abstract thinking), Knowledge (accumulated information and verbal understanding), Quantitative Reasoning (numerical and mathematical thinking), Visual-Spatial Processing (ability to mentally manipulate visual information and space), and Working Memory (holding and manipulating information over short periods). These domains collectively form an overall IQ score, reflecting performance across multiple cognitive areas.

Some other standardized batteries emphasize a four-index model—for example, separate Verbal and Nonverbal/Perceptual abilities, plus Working Memory and Processing Speed—but the five-domain framework is a common and well-recognized way to describe the breadth of constructs typically assessed. That’s why the five-construct approach is considered the best fit for this question.