Which is the best simple exercise to test understanding of secondary colours?

Correct answer: Mix two primary colours and name the result

A useful assessment should test both the process and the concept. Mixing two primary colours demonstrates the process, while naming the resulting colour demonstrates classification. For instance, red plus yellow gives orange, yellow plus blue gives green, and blue plus red gives violet in the traditional pigment model. Counting colours, drawing unrelated lines or measuring a brush does not test secondary-colour knowledge.