ACT Science Reasoning Practice Test
The ACT Science Reasoning exam is a 55-question, 35-minute assessment designed to measure the skills required in the natural sciences: interpretation, analysis, evaluation, reasoning, and problem-solving. It is not a test of specific scientific facts or advanced coursework. Instead, it evaluates your ability to understand and work with scientific information presented in three formats: Data Representation (graphs, tables), Research Summaries (descriptions of experiments), and Conflicting Viewpoints (alternative hypotheses or theories). The test is a core component of the ACT college admissions exam, taken by high school students applying to undergraduate programs. Success on this section demonstrates to colleges your capacity to think critically about scientific material, a foundational skill for academic success in many fields, not just science.
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Passage EMI-7: Aurora brightness Scientist A links brightness to charged-particle flux from solar wind. Scientist B links brightness mainly to local cloud cover changing visibility. If the first model is correct, what prediction should be most reasonable in a new case?
Passage EMI-6: Geyser eruption timing Model 1 says eruptions occur after the underground reservoir reaches a pressure threshold. Model 2 says eruptions occur after a fixed amount of heat accumulates. If the first model is correct, what prediction should be most reasonable in a new case?
Passage EMI-9: Exoplanet atmosphere Team A says a planet's spectrum indicates water vapor. Team B says the same absorption feature is caused by methane plus instrument noise. Which statement best describes how to distinguish the two explanations?
Passage SIN-8: Slope erosion Soil trays were set at slopes of 5, 15, 25, and 35 degrees. A sprinkler delivered the same water volume, and eroded sediment was collected. Which factor should be controlled to make the comparison fair?
Passage SIN-2: Plant nitrate growth Students grew bean seedlings for 18 days using nitrate solutions of 0, 10, 30, and 60 mg/L. All pots used the same soil mass, light schedule, and water volume. Which design flaw would most weaken the conclusion?