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While testing the effect of salt concentration on whether an egg floats, which variable should be controlled?

Answer and explanation

Correct answer: Volume of water

The answer is C, volume of water. The question asks for a controlled variable, so we need a condition kept the same while salt concentration is changed. Keeping the water volume constant makes the comparison fair and helps isolate the effect of salt concentration. A, salt concentration, is the independent variable because it is deliberately changed. B, whether the egg floats, is the dependent outcome being observed. C is correct because water volume is held constant. D, solution density, is affected by the salt concentration and is closely related to the experimental effect, so it should not be selected as the controlled factor here; it may be a measured or resulting property. The fair-test chain is: change salt concentration, observe floating, keep water volume the same. Do not choose the outcome as a control.

Related tags

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

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