ACT Science — a timed set: three mini-passages at one minute per question

On the enhanced ACT the Science section is optional and sits outside the Composite, but for anyone who takes it the clock is the main difficulty: 40 questions in 40 minutes, of which 34 are scored, with no calculator permitted and no penalty for a wrong answer. That is about one minute per question, including the time needed to read each passage, and it leaves no room for reading every sentence of every passage before answering.

This material is a short timed set built to practice that rhythm. It has three mini-passages, one of each kind the section uses, with four questions each and a target of about four minutes per passage, twelve minutes in all. The first is a data passage with a drawn line graph of air temperature against altitude on two days: read a value from the right line, find where one line crosses zero, compare the two slopes and extend both trends to the altitude where they would meet. The second is a research summary of two experiments on how dissolved substances lower the freezing point of water: name the independent variable, interpolate a result, compare three solutes and find the factor held constant in both experiments. The third sets two hypotheses for a falling lake level against each other: find their common ground, predict what one hypothesis expects, and choose the finding that strengthens one or weakens the other.

Each question states its passage in full and carries the time target, so you can work the set with a timer and check your pace after each part. The explanations show the fastest route to each answer, for instance reading only the line and the gridline a question needs, and name the misreading behind each wrong option.

The flashcards give a practical pacing plan: about one minute per question and about six minutes for a passage of six; a checkpoint at 20 minutes; go to the questions before the prose on data-heavy passages; leave the competing-viewpoints passage for last if it slows you down; guess and mark any question you cannot start within about fifteen seconds; and, because wrong answers cost nothing, fill in every blank in the final two minutes.

This material offers a quiz and flashcards. It does not replace a full-length timed practice test; ACT publishes free practice tests for that. It is independent practice based on ACT's public description of the test, and nothing here is produced or endorsed by ACT.

• Work a data passage, a research-summary passage and a competing-hypotheses passage at about one minute per question
• Read only the part of a figure or procedure each question needs
• Apply a pacing plan: time per passage, a halfway checkpoint and a skip-and-mark rule
• Use the no-penalty rule: never leave a question unanswered

Practice material written by Zestly, based on ACT's published description of the ACT Science section (reporting categories Interpretation of Data, Scientific Investigation, and Evaluating Scientific Arguments and Models with Evidence; act.org, retrieved September 2026). All data sets, figures and questions are original.