MCA Grade 8 Science Practice Questions - Minnesota Comprehensive Assessment (MCA-IV) Science - Grade 8 Exam

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A science class measures the water clarity (turbidity) of a local lake at five different depths. Why must the students use the exact same Secchi disk and line measuring device at each depth?

To ensure that differences in turbidity readings are due to depth rather than variations in the instrument To guarantee that the water clarity increases as the depth of the lake increases To speed up data collection so all measurements can be completed in a single trial To eliminate the need for taking multiple trials at each testing location

Correct Answer:

To ensure that differences in turbidity readings are due to depth rather than variations in the instrument

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