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While measuring the extension of a rubber band at different temperatures, which variable should be kept constant?

Answer and explanation

Correct answer: Applied load

The experiment is designed to find out how temperature affects the extension of a rubber band. Temperature is therefore the independent variable, and extension length is the measured dependent variable. To make the comparison fair, another important factor that could affect extension must remain unchanged.

The applied load should be kept constant. If different loads were used at different temperatures, a change in extension could be caused by the load rather than by temperature, or by both together. Keeping the same rubber band and the same load allows the effect of temperature to be compared more fairly. Thus option C is correct. Temperature cannot be the controlled variable here because it is the factor being deliberately changed.

Related tags

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

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