TEAS Science · Practice Question

    Experimental controls: TEAS Practice Question with Answer & Explanation

    An original TEAS 7-style science practice question, written for nursing-school applicants — with a full breakdown of every answer choice.

    Question

    Why is a control group used in an experiment?

    • A.To guarantee the hypothesis is correct
    • B.To provide a baseline for comparison
      Correct
    • C.To increase the independent variable
    • D.To remove the dependent variable

    Correct answer: B. A control group provides a baseline that helps isolate the effect of the independent variable.

    Why B is correct

    A control group provides a baseline that helps isolate the effect of the independent variable.

    TEAS skill review

    This question tests experimental controls, a concept that can appear in the TEAS science section. Read the prompt carefully, identify the rule or evidence being tested, and eliminate options that do not directly satisfy it.

    Why the other choices are incorrect

    The remaining choices conflict with the relevant fact, calculation, language convention, or passage evidence. Check every option against the exact wording of the question rather than choosing an answer that is only generally related to the topic.

    Quick study tip: The control shows what happens without the tested treatment.

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