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In comparing the cleaning ability of different soaps, which factor should be controlled?

Answer and explanation

Correct answer: Size of stain

A controlled variable is a condition kept the same in every trial so that only the intended factor differs. When comparing different soaps, the type of soap is the independent variable, and cleaning ability is the dependent outcome. Other conditions, including the stain, water volume, washing time, and temperature, should be kept comparable.

The stain size must be kept the same because a larger stain could require more cleaning regardless of the soap used. If stain sizes differed, one soap might appear better simply because it was tested on a smaller stain. Thus stain size is an appropriate controlled variable, so option C is correct. Cleaning ability and amount removed are outcomes, not controls.

Related tags

ScienceControlled-VariableSoapCleaningVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceClass 9 Mcq

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