Final answer:
Functional fixedness is a type of mental set that hinders problem-solving abilities by limiting the perception of an object's uses. Tests of functional fixedness are used to assess divergent thinking and creativity.
Step-by-step explanation:
Functional fixedness refers to the inability to see an object as useful for any other use other than its intended purpose. It is a type of mental set that can hinder problem-solving abilities. Tests of functional fixedness are used to assess divergent thinking and creativity because they require individuals to think beyond the typical uses of objects and come up with innovative solutions.