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Controlled variable

  • ATI TEAS
  • Science: Scientific Reasoning
  • Multiple choice
  • Difficulty 3 of 5

Question

Which feature is held constant?

  1. Distance from the fan✗ Incorrect

    Distance is assigned at different levels.

  2. Change in paper mass✗ Incorrect

    The mass change is the response being recorded.

  3. Exposure duration✓ Correct

    Each sheet spends the same time in the airflow.

  4. Final paper mass✗ Incorrect

    Final mass is not specified as identical across sheets.

Answer

C. Exposure duration

Rationale

The exposure duration is fixed for every sheet. Keeping a condition fixed makes it a controlled variable.

RememberIdentify the chosen difference, the observed response, and the conditions kept consistent.

Sources

  • United States U.S. Environmental Protection Agency · License: US government work (public domain) · Retrieved · Page 21

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