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Why does changing both pressure and angle in a brush-stroke chart make the result difficult to analyse?

Answer and explanation

Correct answer: Because it will be unclear which factor caused the change

The governing concept is controlled practice and fair comparison. A stroke chart should usually change one variable while keeping the others as constant as possible. If pressure and angle change together, any difference in width, direction, or texture could come from either factor, so option D is correct. Immediate drying, transparent paper, and identical strokes do not explain the analytical problem.

Related tags

Stroke ChartControlled PracticeBrush VariablesBrush TechniquesPainting TechniquesArt EducationClass 9 Mcq

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