Which is NOT a subset of fluid reasoning on the IQ test?

• A. Matrix Reasoning
• B. Arithmetic
• C. Vocabulary
• D. Figure Weights

Answer: (C)

Fluid reasoning covers solving novel problems by recognizing patterns, relationships, and abstract rules without relying on what you already know. Tasks like Matrix Reasoning ask you to deduce the underlying pattern among shapes, while Figure Weights requires judging spatial relationships and balancing elements to match a rule—both require figuring things out from new information. Arithmetic does involve mental manipulation, but it hinges on quickly applying numerical operations and keeping information in working memory, which also taps fluid problem-solving to some extent. Vocabulary, on the other hand, measures knowledge of word meanings and language that you’ve learned over time; it reflects crystallized intelligence rather than the ability to reason through unfamiliar problems. So vocabulary is not a subset of fluid reasoning.