ACT 2026 Practice Test Science Scientific Investigation Free Quiz 2

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ACT 2026 Practice Test Science Scientific Investigation Free Quiz 2

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ACT 2026 Practice Test Science Scientific Investigation Free Quiz 2

Practice ACT 2026 Practice Test Science MCQs from Scientific Investigation. Get instant results with Explanation.

General5 MCQs

11. What is a hypothesis?

A. A question about the natural worldB. A testable predictionC. An observationD. A conclusion based on data

12. In an experiment, which sample size would provide the most reliable results?

A. 5B. 10C. 20D. 100

13. What are constants in an experiment?

A. Variables that are kept the sameB. The variable that is changedC. The variable that is measuredD. The group that receives no treatment

14. What is a scientific theory?

A. A guess about how something worksB. A single observationC. A well-tested explanationD. A law that cannot be changed

15. A scientist investigates the effect of light intensity on the rate of photosynthesis. What is the independent variable?

A. Rate of photosynthesisB. Light intensityC. TemperatureD. Carbon dioxide level

General5 MCQs

16. Which of the following is a necessary component of a good experiment?

A. Uses only qualitative observationsB. Has no control groupC. Uses one trial onlyD. Has a clear procedure and controls

17. How should a scientist draw a conclusion?

A. Based on the evidenceB. Based on personal opinionC. Based on what was expectedD. Based on the hypothesis only

18. What is a scientific law?

A. A tentative explanationB. A well-tested explanationC. A description of a natural phenomenonD. A guess about the natural world

19. What is the first step in the scientific method?

A. HypothesisB. QuestionC. PredictionD. Conclusion

20. What is the purpose of controlling variables in an experiment?

A. All variables are changed.B. The independent variable is kept constant.C. The dependent variable is changed.D. All variables except the independent variable are kept constant.

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ACT

Conducting Body: ACT Education Corp

Frequency: 7-8 Times per Year | Time: 165 Minutes

Negative Marking: No

⚡ Test Pattern (Total: 171 MCQs):

English: 50 MCQs
Math: 45 MCQs
Reading: 36 MCQs
Science: 40 MCQs

Merit Formula: Merit_calculation = University/College Specific Weightage = Not Fixed Score_range = 1–36

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