ACT (Enhanced) practice questions
216 free questions with answers and explanations.
- 51.A student is crafting a persuasive essay arguing for increased funding for local parks. They want to appeal to the community's sense of shared responsibility and collective well-being to strengthen their argument. Which rhetorical appeal are they primarily employing?English
- 52.A novelist describes a character as 'a man of stark contrasts: a fierce orator in public, yet a timid recluse in private; a champion of the poor, but a miser with his own fortune.' Which literary device is the novelist primarily using to develop this character?Reading
- 53.A geneticist is studying a newly discovered gene (Gene X) that is hypothesized to influence plant height. They perform an experiment where they cultivate two groups of a genetically identical plant species under identical environmental conditions. Group A plants have a functional Gene X, while Group B plants have a 'knockout' (non-functional) version of Gene X. After 8 weeks, they measure the average height of plants in both groups. Which of the following best describes the role of Group A in this experimental design?Science
- 54.A team of astrophysicists is analyzing data from a newly discovered exoplanet. They have observed periodic dips in the star's brightness, consistent with a planetary transit, and periodic shifts in the star's radial velocity, indicating a gravitational tug from the planet. The transit data provides the planet's radius relative to the star, and the radial velocity data provides the planet's mass. By combining these two sets of observations, what fundamental property of the exoplanet can the astrophysicists calculate that neither method can determine alone?Science
- 55.A student is writing an essay about the complexities of climate change and wants to clearly distinguish between 'weather' and 'climate.' They have written the sentence: 'The difference between weather and climate is often misunderstood.' Which of the following revisions uses the most precise diction to clarify the distinction?English
- 56.A marine biologist is studying the growth rate of a specific type of coral under varying ocean acidification conditions. They set up several tanks, each with a different pH level (7.8, 8.0, 8.2, 8.4). All other factors, such as temperature, light, and nutrient levels, are kept constant across all tanks. Coral growth is measured weekly. In this experiment, what is the independent variable?Science
- 57.A research paper argues that 'the widespread adoption of remote work during the pandemic has irrevocably altered urban demographics, leading to a significant outflow of residents from major metropolitan centers to suburban and rural areas.' To strengthen this argument, which of the following would be the MOST relevant evidence to include?Reading
- 58.A climatologist is analyzing a graph that shows global average temperatures over the past 150 years. The x-axis represents years, and the y-axis represents temperature anomaly (deviation from a baseline average). The graph displays a general upward trend, but with significant year-to-year fluctuations. Which of the following statements is the most accurate interpretation of this data?Science
- 59.A student is writing a research paper on the economic impact of artificial intelligence. They want to ensure their writing maintains a formal and objective tone. Which of the following sentences should the student revise to better align with this goal?English
- 60.A historical text discusses the causes of the American Civil War. It dedicates a significant portion to detailing the economic differences between the North and the South, focusing on industrialization versus agrarianism and the reliance on slave labor in the South. It then moves to describe the various political compromises attempted, such as the Missouri Compromise and the Compromise of 1850, and how each ultimately failed to resolve the growing divisions. Finally, it touches upon the cultural and ideological clashes. Which of the following elements is most central to the text's overall argument about the war's origins?Reading
- 61.A student is writing an essay about the importance of environmental conservation. They want to use a strong, active voice to emphasize human responsibility. They have written the following sentence: 'The environment is being damaged by pollution from factories.' Which of the following revisions best uses active voice to highlight human agency?English
- 62.A journalist reports on a new government policy, quoting heavily from the official policy document and statements made by government spokespersons. The article focuses solely on explaining the policy's provisions and the stated objectives. Which of the following best describes the journalist's approach to reporting this story?Reading
- 63.Read the following excerpt from a science article: 'The recent discovery of extremophiles thriving in hydrothermal vents deep beneath the ocean's surface has challenged long-held assumptions about the conditions necessary for life. These organisms, which flourish in environments previously thought to be inimical to biological processes, utilize chemosynthesis rather than photosynthesis. Their existence suggests that life may be far more resilient and widespread throughout the universe than previously imagined.' Which of the following statements best summarizes the central idea of this excerpt?Reading
- 64.A student is revising an essay and encounters the following sentence: 'The committee, comprised of various stakeholders, were tasked with developing a new policy.' The student recognizes a grammatical error. Which of the following corrections addresses the error?English
- 65.A student is writing a literary analysis essay and wants to ensure their writing is free of logical fallacies. They have written the following sentence: "Everyone agrees that Shakespeare is the greatest playwright of all time, so his plays must be the most profound." Which logical fallacy is most evident in this statement?English
- 66.A scientific journal article begins with a detailed account of a global pandemic's devastating effects on human populations and economies. The subsequent sections then describe various public health interventions, such as vaccination campaigns and social distancing measures, and analyze their effectiveness. What organizational pattern does this article primarily employ?Reading
- 67.A historical document from the 17th century describes a new colonial settlement: "The land, though fertile and abundant in timber, was also home to various 'savage tribes' who frequently 'molested' our surveyors and 'hindered' our righteous expansion. Despite these challenges, our resolve, guided by divine providence, remains unwavering in establishing a foothold for civilization in this wilderness." Based on the author's language, what can be inferred about the prevailing attitude towards the indigenous population?Reading
- 68.Read the following excerpt from a literary analysis: "The novel's protagonist, a disillusioned war veteran, frequently revisits the battlefield in his dreams. These nocturnal journeys are not mere nightmares; they are vivid, almost tactile experiences where the scent of gunpowder and the cries of the wounded are as real as the morning dew. Through these recurring dream sequences, the author masterfully conveys the indelible psychological scars of conflict, suggesting that true peace remains elusive for those who have witnessed its horrors firsthand." Which of the following best describes the author's primary technique for revealing the protagonist's internal struggle?Reading
- 69.A student is designing an experiment to determine if the color of light affects the growth rate of radishes. They plan to grow 30 radish plants in each of four conditions: natural sunlight, red light, blue light, and green light. All plants will receive the same amount of water, soil, and temperature. After 3 weeks, the height of each plant will be measured. To ensure the reliability of their results, which of the following actions is most crucial?Science
- 70.A medical researcher is conducting a study to determine the efficacy of a new vaccine against a common viral infection. They recruit 1,000 participants and randomly divide them into two groups. Group A receives the new vaccine, and Group B receives a placebo. Neither the participants nor the researchers administering the treatments know who is receiving the vaccine or the placebo. After six months, the number of infection cases in each group is recorded. What is the primary purpose of using a placebo in this experimental design?Science
- 71.A literary critic writes: 'While Melville's Moby Dick is often hailed as a profound exploration of obsession and humanity's struggle against nature, its dense prose and extensive digressions frequently alienate modern readers, making it a challenging, though ultimately rewarding, classic.' Which of the following best captures the critic's overall assessment of Moby Dick?Reading
- 72.A student conducts a series of experiments to determine the density of an unknown liquid. They measure the mass of a graduated cylinder, then add 25.0 mL of the liquid and measure the combined mass. This procedure is repeated three times. The results are: Trial 1: Mass of cylinder = 50.2 g, Mass of cylinder + liquid = 75.7 g Trial 2: Mass of cylinder = 50.1 g, Mass of cylinder + liquid = 75.6 g Trial 3: Mass of cylinder = 50.3 g, Mass of cylinder + liquid = 75.8 g What is the average density of the liquid, expressed with the correct number of significant figures?Science
- 73.A geologist is studying rock samples from a newly discovered cave system. They find several layers of sedimentary rock, with each layer containing different fossilized organisms. The deepest layer contains trilobites, the middle layer contains ammonites, and the topmost layer contains early mammalian fossils. Assuming no geological disturbance has occurred, what principle allows the geologist to determine the relative ages of these fossils?Science
- 74.A biologist is studying the effect of a new antibiotic on bacterial growth. They prepare agar plates with different concentrations of the antibiotic (0 µg/mL, 5 µg/mL, 10 µg/mL, 20 µg/mL). An equal amount of bacterial culture is spread on each plate. After 24 hours of incubation at 37°C, the number of bacterial colonies is counted. The data shows: - 0 µg/mL: 150 colonies - 5 µg/mL: 90 colonies - 10 µg/mL: 30 colonies - 20 µg/mL: 5 colonies Based on these results, what is the most appropriate conclusion regarding the antibiotic's effectiveness?Science
- 75.A student measures the mass of a rock sample three times: 15.2 g, 15.3 g, and 15.2 g. The known actual mass of the rock is 16.5 g. Which of the following statements best describes the student's measurements?Science
- 76.A memoir includes a lengthy reflection on the author's childhood home, describing its peeling paint, creaky floors, and overgrown garden. The author concludes this section by stating, 'It was a house that whispered tales of neglect, yet held the loudest echoes of my earliest joys.' What is the primary function of this detailed description within the memoir?Reading
- 77.A political commentator states: "While the proposed tax reform promises to stimulate economic growth by incentivizing investment, critics argue that its benefits will disproportionately accrue to the wealthy, exacerbating income inequality. Furthermore, the projected revenue shortfall could necessitate cuts to essential public services, ultimately burdening the most vulnerable populations. A truly effective reform would balance economic stimulus with equitable distribution and social safety nets." The commentator's argument is primarily structured to:Reading
- 78.A marine biologist is studying the population dynamics of a specific fish species in a coral reef. Over five years, they record the average number of fish observed per 100 square meters of reef. The data are as follows: Year 1 (55 fish), Year 2 (62 fish), Year 3 (58 fish), Year 4 (65 fish), Year 5 (70 fish). Based on this data, what is the most reasonable conclusion about the fish population trend?Science
- 79.A pharmaceutical company is conducting a Phase III clinical trial for a new drug. The trial involves thousands of patients across multiple sites. To ensure the integrity of the results, an independent data monitoring committee (DMC) is established. The DMC's primary role is to regularly review accumulated data from the ongoing trial, including adverse events and efficacy endpoints, and to make recommendations regarding its continuation, modification, or termination. Which ethical principle does the establishment of a DMC primarily uphold in this context?Science
- 80.A student is writing a persuasive essay arguing for increased funding for public libraries. They want to appeal to the community's shared values and sense of civic responsibility. Which of the following statements would best achieve this rhetorical purpose?English
- 81.In a research paper, an author cites a study from 1995 that used a small sample size and a non-random selection method. The author then uses the findings of this study as foundational support for a contemporary argument about public opinion trends. What is the most significant weakness in the author's use of this evidence?Reading
- 82.A student is writing an essay about the complexities of climate change and wants to clearly differentiate between two related but distinct concepts: global warming and climate variability. They have written the following sentence: 'Global warming refers to the long-term heating of Earth's climate system observed since the pre-industrial period due to human activities, while climate variability describes natural, short-term fluctuations in weather patterns.' Which of the following revisions would best enhance the clarity and precision of the distinction between these two concepts?English
- 83.A student is writing an argumentative essay about the benefits of renewable energy. They have written the following topic sentence for a paragraph: "Solar power, a leading form of renewable energy, offers numerous environmental advantages, such as reducing carbon emissions and minimizing reliance on fossil fuels." Which of the following sentences would best serve as a supporting detail for this topic sentence?English
- 84.A climate scientist uses a predictive model to forecast global temperature changes over the next century. The model incorporates various factors like greenhouse gas emissions, solar activity, and volcanic eruptions. After running the model, the scientist observes that the predicted temperature increase is significantly lower than what independent observational data indicates for recent decades. What is the most appropriate next step for the scientist?Science
- 85.A student is revising a narrative essay and wants to ensure that all verb tenses are consistent within a single sequence of events. They have written the following paragraph: 'She walked to the window, gazing out at the storm. The wind howls outside, rattling the panes. A shiver ran down her spine as she watches the lightning.' Which of the following revisions corrects the inconsistent verb tenses?English
- 86.A student is writing an essay and wants to avoid common grammatical errors. They have written the following sentence: "The primary goal of the project was to identify the root causes of customer dissatisfaction, and to implement effective solutions." Which grammatical principle is violated in this sentence?English
- 87.A student is revising an essay and encounters the following sentence: "Despite their best efforts, the team was unable to complete the project on time." The student wants to make the sentence more concise and impactful without changing its meaning. Which of the following revisions best achieves this goal?English
- 88.A climate scientist is analyzing tree ring data to reconstruct historical climate patterns. Wider tree rings generally indicate periods of favorable growth conditions (e.g., adequate rainfall, moderate temperatures), while narrower rings suggest less favorable conditions. If a section of tree rings shows a consistent pattern of narrow rings for 15 consecutive years, followed by a sudden shift to significantly wider rings for the next 20 years, what is the most reasonable inference about the climate in that region?Science
- 89.A climatologist is analyzing historical temperature data for a specific region. They observe a strong correlation between periods of increased volcanic activity and a decrease in global average temperatures. Based on this observation, the climatologist infers that volcanic eruptions can contribute to short-term global cooling. Which of the following is an underlying assumption made by the climatologist in drawing this inference?Science
- 90.A historian argues that 'the decline of the Roman Empire was not a catastrophic collapse but a gradual transformation, a slow metamorphosis influenced more by internal socio-economic shifts than by external barbarian invasions.' Which of the following statements, if true, would most weaken the historian's argument?Reading
- 91.A research team is developing a new computational model to predict the spread of invasive species in aquatic ecosystems. The model incorporates variables such as water flow, species reproductive rate, and environmental resistance. To validate the model, they compare its predictions to historical data from several known invasive species outbreaks. The model consistently overestimates the rate of spread and the final affected area by 20-30% compared to actual observations. Which of the following is the most appropriate next step for the research team?Science
- 92.Consider the following two statements: Statement 1: 'The average temperature of Earth has increased by 1.2 degrees Celsius since the late 19th century, with the most significant warming occurring in the last four decades.' Statement 2: 'Many scientists believe that human activities, particularly the emission of greenhouse gases, are the primary drivers of this observed warming trend.' Which of the following best describes the relationship between Statement 1 and Statement 2?Reading
- 93.A botanist investigates the optimal light intensity for a specific shade-loving plant. They grow identical plants under four different light intensities (500 lux, 1000 lux, 1500 lux, 2000 lux) for six weeks. All other factors such as temperature, humidity, and watering schedule are kept constant. At the end of the experiment, the average biomass (dry weight) of the plants in each group is measured. Which of the following is the most appropriate way to represent the results of this experiment to easily identify the optimal light intensity?Science
- 94.A student is writing a descriptive essay about a bustling city market. They want to use vivid language to engage the reader's senses. They have written the following sentence: 'The market was busy and there were many different smells.' Which of the following revisions best uses sensory details to enhance the description?English
- 95.A literary critic writes: "While the novel's intricate plot and richly developed characters initially captivate, the author's relentless use of anachronisms ultimately undermines the historical authenticity. This stylistic choice, though perhaps intended to provoke, instead creates a jarring dissonance that distances the reader from the narrative's otherwise compelling world." Which of the following best describes the critic's overall assessment of the author's use of anachronisms?Reading
- 96.A political analyst states: 'The recent electoral outcome, while surprising to many pundits, was a predictable consequence of years of economic stagnation and growing public disillusionment with the established political order. The electorate, tired of unfulfilled promises, simply sought a radical departure from the status quo.' Which of the following assumptions does the analyst make about the electorate's motivation?Reading
- 97.A scientist proposes a model to explain the formation of a planetary ring system. The model suggests that tidal forces from a nearby gas giant cause a large moon to break apart into smaller fragments, which then spread out to form a ring. Which of the following observations would most strongly support this model?Science
- 98.A research paper analyzes the impact of climate change on polar bear populations. It cites multiple long-term studies detailing declines in sea ice extent and thickness, directly linking these changes to reduced hunting success for polar bears and subsequent declines in their body condition and reproductive rates. The paper concludes by stating that 'without significant global action to mitigate greenhouse gas emissions, the long-term survival of polar bears is severely threatened.' What is the author's primary purpose in writing this paper?Reading
- 99.A political speech delivered during a time of economic crisis repeatedly uses phrases such as 'our shared burden,' 'united we stand,' and 'the collective spirit of our nation.' The speaker's deliberate use of these phrases is primarily intended to:Reading
- 100.A historical essay discusses the economic impact of the Industrial Revolution, stating: "The advent of steam power dramatically increased manufacturing output, leading to unprecedented wealth accumulation for factory owners. Concurrently, the burgeoning urban centers, fueled by rural migration, faced severe overcrowding and sanitation crises, creating stark social inequalities that persisted for decades." Which of the following statements best summarizes the author's central claim regarding the Industrial Revolution?Reading