science — Act Practice Questions

101 free Act questions on science: 44 easy, 49 medium, and 8 hard, every one exam-realistic and fully explained once you sign in. This is the fastest way to turn science from a weakness into a scoring area — drill it in 10-question reps with immediate feedback.

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1. A chemist compared the reaction rates of a process with and without a catalyst: Temp (^circC) | Rate WITHOUT
2. What is the relationship?
3. Which species has a higher population at Year 5?
4. A soil scientist measured the water retention of different soil types: Soil Type | Water Retained (mL) Sand |
5. A table lists the pressure of a gas at different volumes while temperature is constant: 1.0 L | 4.0 atm; 2.0 L
6. A table shows the density of four unknown liquids: Liquid A | 0.85 g/cm³; Liquid B | 1.00 g/cm³; Liquid C | 1.
7. The table below provides the frequency and wavelength of several waves: Wave | Frequency (Hz) | Wavelength (m)
8. The table below shows the stopping distance of a car at different speeds: Speed (km/h) | Stopping Distance (m)
9. What happens to the concentration of salt in the remaining liquid?
10. A biologist hypothesizes that the activity of Enzyme X peaks at a neutral pH of 7.0 and decreases as the envir
11. What happened to the dye molecules?
12. What is the independent variable?
13. Which confounding variable is present?
14. What will happen to the cell due to osmosis?
15. What is the primary reason the results are unreliable?
16. A chemist tracks the concentration of a product in a second-order reaction over time. Based on the table, what
17. A geologist hypothesizes that higher altitudes result in a lower boiling point for water due to decreased atmo
18. Which statement correctly describes the molecules in the ice during this process?
19. A marine biologist hypothesizes that the density of a specific plankton species is highest in the 'sunlight zo
20. Two scientists disagree about a layered rock outcrop containing fossils. Geologist A: The layers were deposite
21. An environmental scientist measures the light intensity at different depths in a lake. If the trend continues
22. Which of the following stays exactly the same in both locations?
23. An oceanographer measures the salinity of seawater at different depths. Based on the data below, what is the s
24. A physicist hypothesizes that the period of a pendulum is determined solely by the length of the string and is
25. What is the primary benefit of performing 5 trials for each angle?
26. A physics student measures the displacement of a spring as various weights are added. According to the table
27. A chemist measured the volume of gas produced by a reaction at five temperatures, with pressure held constant:
28. A researcher observes that a population of desert plants has developed thicker waxy coatings on their leaves o
29. What is the role of the 1 m square size?
30. A scientist measures the reaction rate of a specific enzyme at varying temperatures and records the following