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Which experiment can fairly study the effect of brush pressure?

Answer and explanation

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

The governing concept is a controlled experiment: change one independent variable while keeping relevant conditions constant. To test brush pressure, the paint, paper, moisture, brush type, and movement speed should remain the same, while pressure is varied deliberately. Option C follows this fair-test method. Options A and D change several variables, and B changes both material and colour, so their effects cannot be separated.

Related tags

Brush PressureControlled ExperimentVariable ControlFair TestingBrush TechniquesPainting TechniquesArt EducationClass 9 Mcq

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