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Which setup correctly tests the effect of pressure in colour filling?

Answer and explanation

Correct answer: Keep colour moisture brush speed and paper constant while changing only pressure

The governing concept is a fair controlled comparison: the independent variable is pressure, while colour, moisture, brush speed and paper are controlled variables. Option C is correct because any difference between samples can then reasonably be attributed to pressure. Changing paper, brush size or every factor at once introduces confounding influences and prevents a reliable conclusion about the tested technique.

Related tags

Pressure ExperimentControlled VariablesColour FillingArt StudyColour Filling And BlendingPainting TechniquesArt EducationClass 9 Mcq

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