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The burning time of candles of different lengths is measured. Which is the dependent variable?

Answer and explanation

Correct answer: Burning time

In an experiment, the dependent variable is the result that is observed or measured. The independent variable is the factor deliberately changed to investigate its effect. In this investigation, candle length is changed or compared, while the time for which each candle burns is recorded. The recorded burning time may therefore depend on the selected candle length, provided other important conditions are kept as similar as possible.

Option B is correct because burning time is the measured outcome. Candle length is the independent variable, not the dependent one. Candle colour and wick thickness are not identified as the measured result in the question; they would need to be controlled or kept consistent if they could affect burning. The key test is to ask, “What is being measured?” Here, the answer is the time taken to burn.

Related tags

ScienceDependent-VariableCandleBurning-TimeVariables In An ExperimentExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceClass 9 Mcq

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