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If fan speed is changed and the drying time of a wet cloth is measured, what is the independent variable?

Answer and explanation

Correct answer: Fan speed

The independent variable is the factor that the investigator deliberately changes to study its effect. The dependent variable is the result that is observed or measured. Other important conditions, such as cloth size and initial water amount, should usually be kept the same so that the comparison is fair.

In this experiment, the researcher changes the fan speed and measures how long the wet cloth takes to dry. Thus fan speed is the independent variable, so option A is correct. Drying time is the dependent variable because it responds to the change in fan speed. Cloth size and amount of water may be controlled variables if they are kept constant. Changing only the selected factor makes it easier to judge its effect on drying.

Related tags

ScienceIndependent-VariableDryingFan-SpeedVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceClass 9 Mcq

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