ACT Science Reasoning Practice Test
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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.
Preguntas de Muestra
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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?
Passage SIN-1: Antibiotic disk test A microbiology class placed paper disks soaked with three antibiotic concentrations on identical agar plates streaked with the same bacterial culture. Plates were incubated for 24 hours. Which factor should be controlled to make the comparison fair?
Passage IOD-12: Enzyme inhibitor A biochemistry class mixed the same enzyme and substrate concentrations, then added different inhibitor concentrations before measuring product formed in 1 minute. | Inhibitor concentration (uM) | Product formed (mg) | | ---------------------------- | ------------------- | | 0 | 44 | | 5 | 32 | | 10 | 23 | | 20 | 12 | If another measurement were made at about 7.5 uM, which value of Product formed (mg) would be the most reasonable interpolation?
Passage IOD-7: Storm runoff After a storm, a stream team sampled water at four times after peak rainfall. They kept bottle depth and test method the same for all samples. | Hours after rainfall peak | Turbidity (NTU) | | ------------------------- | --------------- | | 1 | 92 | | 3 | 61 | | 6 | 38 | | 12 | 17 | At which Hours after rainfall peak was the largest value of Turbidity (NTU) recorded?
Passage IOD-6: Wall insulation A model house was heated to 30 C and then placed in a 10 C room. Students changed only the insulation thickness and measured heat loss after 15 minutes. | Insulation thickness (cm) | Heat lost (C) | | ------------------------- | ------------- | | 0 | 12.4 | | 2 | 8.7 | | 4 | 6.1 | | 6 | 4.2 | If another measurement were made at about 3 cm, which value of Heat lost (C) would be the most reasonable interpolation?
Qué temas cubre este examen
01Evaluation of Models, Inferences, and Experimental Results
This domain covers the careful evaluation of complex models, logical inferences, and experimental results to determine their consistency with the provided scientific information during the test and subsequent analytical question sections.
02Interpretation of Data
This domain focuses intensely on the interpretation of data presented in various graphs, tables, and charts throughout the multiple-choice sections of the exam, helping candidates develop vital analytical skills for test success.
03Scientific Investigation
This domain measures your fundamental understanding of scientific investigation tools, methods, procedures, and the basic principles of experimental design required for complete success across multiple testing formats and careful evaluation procedures.