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A student investigates how fan speed affects the drying time of wet cloth. If the initial water mass in the cloth pieces differs, what is the most appropriate action?

Answer and explanation

Correct answer: प्रारंभिक जल-द्रव्यमान समान रखना

The amount of water initially present directly affects how long a cloth takes to dry. If it differs between pieces, the result may be caused by water mass rather than fan speed. Therefore the initial water mass should be measured and made equal, while fan speed remains the independent variable and drying time remains the dependent variable. Option B would prevent the intended comparison.

Related tags

Controlled VariableDrying TimeFan SpeedFair TestVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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