Hard Act Practice Questions

50 free hard-difficulty Act questions, drawn live from KomFi's calibrated bank. These are the items that separate top scorers — every one carries a full explanation and trap analysis once you sign in.

1. Which choice best maintains parallel structure and logic?
2. Having trained for months in the thin mountain air, [the marathon felt almost easy to Devon on race day at sea
3. What is dfrac3+2i1-i written in the standard form a+bi, where i=√(-1)?
4. Solve for x: log_2 (x) + log_2 (x - 2) = 3.
5. If log_b 3 = 0.5 and log_b 2 = 0.3, what is the value of log_b 18?
6. If sin A = (1)/(2) in Δ ABC, and side a = 10, what is the length of the diameter of the circle that circumscri
7. Critics of the new urban-greening initiative argued that planting trees along commercial corridors was a cosme
8. From a social-science passage: "Economists once treated traffic as a fluid: pour in more cars, widen the chann
9. The marsh, the surveyors agreed, was a nuisance: it bred mosquitoes, swallowed survey stakes, and resisted eve
10. Passage: For most of his career, the naturalist regarded the marsh behind his cottage as a tedious place, a fl
11. The lighthouse keeper kept meticulous logs, recording wind, tide, and the passage of every vessel in a hand th
12. The following passage is from a memoir. For years I had described my grandmother's silence as stubbornness, a
13. Passage: Historians of science once treated the laboratory notebook as a transparent window—a faithful record
14. Critics of the new river dam praised it as a triumph of engineering, and in the narrow sense they were right:
15. Read the following passage, then answer the question. Economists once treated a forest chiefly as a stockpile
16. For thirty years the lighthouse keeper had logged the same observation each dawn: the gulls departed the headl
17. The river does not so much flow as negotiate. Where the engineers laid their straight concrete channel, the wa
18. For decades, economists treated the household as a single decision-maker, a tidy fiction that let equations ba
19. When the river town flooded in the spring of 1889, the merchants along Front Street did not wait for the water
20. Two scientists disagree about a layered rock outcrop containing fossils. Geologist A: The layers were deposite
21. Two students debate why a sealed bottle of soda goes flat faster when left open. Student A: Carbon dioxide (ma
22. Two scientists debate why a lake's dissolved oxygen (DO) drops sharply each August. Scientist 1: The drop is c
23. Which choice best completes the parallel structure?
24. Which choice best corrects the punctuation of the underlined portion?
25. Which choice most effectively highlights the contrast between the two releases?
26. Marine biologist Dr. Elena Vasquez, [whose research on coral bleaching has reshaped conservation policy], will
27. Examine this chemistry passage: [1] A catalyst was added to… — What is the most logical placement for this sen
28. Neither the lengthy appendix nor the detailed footnotes [were] enough to convince the skeptical reviewers that
29. The committee's recommendation, which surprised no one who had followed the debate, was that the funds be redi
30. The new policy was intended to reduce waste, conserve resources, and [to lower the company's energy costs] ove

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