TEAS Science · Practice Question

    Scientific reasoning: 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 increase the independent variable
    • B.To provide a comparison baseline
      Correct
    • C.To eliminate all measurements
    • D.To guarantee the hypothesis is correct

    Correct answer: B. A control group provides a baseline against which the effect of the tested condition can be compared.

    Why B is correct

    A control group provides a baseline against which the effect of the tested condition can be compared.

    How to solve this TEAS question

    Identify what the question is testing, eliminate choices that conflict with the relevant rule or evidence, and then select the option that directly answers the prompt.

    Review the alternatives

    The other choices do not satisfy the scientific fact, mathematical operation, language rule, or reading evidence tested by this question. Always compare each option with the exact wording of the prompt before deciding.

    Quick study tip: Ask what comparison is needed to isolate the treatment effect.

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