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Which is the correct experiment for studying the effect of pressure in colour filling?

Answer and explanation

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

The governing concept is a controlled experiment: change one independent variable while keeping other relevant conditions constant. To study pressure, the brush, colour, moisture, paper, and movement speed should remain comparable, while pressure alone is varied. The resulting differences in line width, opacity, or deposited colour can then be attributed to pressure. Therefore option A is correct; the other choices introduce confounding variables.

Related tags

Controlled ExperimentBrush PressureColour FillingVariable ControlBrush TechniquesPainting TechniquesArt EducationClass 9 Mcq

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