Free SAT Practice Test

Although the newly discovered deep-sea microbial community thrives in total darkness near hydrothermal vents, its metabolic processes are surprisingly ______ to those of surface bacteria that depend on sulfur oxidation for cellular energy. Which choice completes the text with the most logical and precise word or phrase?

Biologist Dr. Elena Vance studied how artificial light at night disrupts nocturnal pollinators. In suburban field trials, flower patches illuminated by standard LED streetlights experienced a 62% decrease in moth visits compared to unlit control patches. However, when streetlights were fitted with narrow-spectrum red optical filters, moth visitation rebounded to 94% of baseline levels while maintaining adequate pedestrian visibility. Which finding from Dr. Vance's study best supports the claim that spectral filtering can mitigate the ecological damage of urban lighting?

While researching a topic, a student has taken the following notes: • The Great Barrier Reef is composed of over 2,900 individual reefs spanning 2,300 kilometers. • In 1981, UNESCO designated the Great Barrier Reef as a World Heritage Site. • Mass coral bleaching events triggered by elevated sea temperatures occurred in 2016, 2017, 2020, 2022, and 2024. • Marine scientists utilize satellite thermal mapping and autonomous submersibles to survey coral bleaching. The student wants to emphasize the recurring frequency of climate-induced threats to the reef. Which choice most effectively uses the relevant information from the notes to accomplish this goal?

Awarded the Nobel Prize in Physics for her pioneering research on chirped pulse amplification, physicist Donna Strickland became only the third woman in history to win the ______ her groundbreaking laser discoveries at the University of Rochester transformed optical science and laser surgery. Which choice completes the text so that it conforms to the conventions of Standard English?

A regional courier company charges a flat pickup fee plus a constant hourly transit rate for express deliveries. For a delivery requiring 3 hours of transit, the total charge is $115. For a delivery requiring 7 hours of transit, the total charge is $235. What is the flat pickup fee charged by the courier company?

A laboratory technician mixes two saline solutions. Tank A contains 60 liters of a 15% saline solution by volume. The technician adds 40 liters of a 30% saline solution to Tank A. What is the saline concentration percentage of the resulting 100-liter mixture?

The quadratic function g is defined by g(x) = x² - 6x + k, where k is a constant. In the xy-plane, the graph of y = g(x) is tangent to the horizontal line y = -4 at exactly one point. What is the value of k?

In the xy-plane, a circle with center (0, 0) has a radius of 10. Point P lies on the circle in the second quadrant such that the ray from the origin through P forms an angle θ with the positive x-axis. If cos(θ) = -0.6, what is the y-coordinate of point P?

In many mammalian species, juvenile play behavior appears energetically wasteful and perilous, exposing young animals to predation. However, neurobiologists have observed that sustained social play stimulates the production of brain-derived neurotrophic factor (BDNF), a protein essential for synaptic plasticity in the prefrontal cortex. This biochemical mechanism suggests that the immediate physiological costs of play are offset by long-term enhancements in behavioral adaptability and social cognitive processing. Which choice best describes the overall structure of the text?

Rejecting the ornate decorative facades characteristic of late nineteenth-century Beaux-Arts architecture, modernist architect Ludwig Mies van der Rohe championed a style defined by rectilinear steel frames, expanses of plate glass, and ______ structural clarity. This unadorned aesthetic prioritized functional simplicity and industrial materials over superfluous embellishment. Which choice completes the text with the most logical and precise word or phrase?

Cognitive psychologists studying memory consolidation tested two study regimens for learning second-language vocabulary: 'massed practice' (cramming all study into a single four-hour block) and 'spaced repetition' (distributing four one-hour sessions across two weeks). While both cohorts exhibited comparable recall during an immediate post-test, the spaced repetition group demonstrated an 83% retention rate on a surprise evaluation conducted thirty days later, compared to only 28% for the massed cohort. The researchers concluded that temporal intervals between study sessions force the brain to actively reconstruct fading neural pathways, thereby encoding information into durable long-term memory. Which choice best states the main idea of the text?

Text 1 Urban planners increasingly advocate for extensive green roofs—layers of vegetation cultivated over waterproof building membranes. By intercepting solar radiation and releasing moisture through evapotranspiration, green roofs dramatically reduce surface temperatures, curbing the urban heat island effect and reducing municipal air-conditioning demands by up to 25% during summer peaks. Text 2 While the thermodynamic benefits of vegetative roofing are well documented, structural engineers caution that retrofit installations entail severe structural risks. Saturated soil and mature plant biomass can impose dynamic structural loads exceeding 150 kilograms per square meter, requiring expensive structural reinforcement of older roof joists and ongoing moisture-barrier maintenance to prevent catastrophic water intrusion. Based on the texts, how would the author of Text 2 most likely respond to the urban planners' advocacy in Text 1?

For decades, paleontologists debated whether non-avian theropod dinosaurs were ectothermic (cold-blooded) or endothermic (warm-blooded). Geochemist Dr. Aris Thorne analyzed carbonate clumped-isotope paleothermometry in fossilized eggshells across sixteen dinosaurian taxa from the Late Cretaceous. Thorne discovered that internal egg-formation temperatures across all sampled theropods consistently ranged from 32°C to 38°C, regardless of whether the fossil specimens were recovered from tropical equatorial basins or sub-polar high-latitude fossil beds that experienced near-freezing seasonal ambient temperatures. This finding strongly implies that ______ Which choice most logically completes the text?

While researching a topic, a student has taken the following notes: • Astronomer Vera Rubin examined the orbital velocity of stars in the outer regions of spiral galaxies in the 1970s. • Under Newtonian gravitational physics, stars farther from the dense galactic center were expected to orbit at slower speeds than interior stars. • Rubin observed that peripheral stars orbited just as rapidly as inner stars, producing flat galaxy rotation curves. • This velocity discrepancy provided the first compelling observational evidence for vast halos of invisible 'dark matter' encompassing galaxies. • Rubin's work fundamentally revolutionized modern astrophysics and cosmology. The student wants to introduce Vera Rubin and her major astronomical contribution to an audience unfamiliar with galaxy kinematics. Which choice most effectively uses the relevant information from the notes to accomplish this goal?

Lithium-ion batteries have become the dominant energy storage technology for consumer electronics and electric vehicles due to their high gravimetric energy density. ______ their reliance on scarce materials such as cobalt and nickel, combined with the risk of thermal runaway fires under mechanical stress, has prompted chemical engineers to accelerate research into safer, earth-abundant solid-state sodium-ion alternatives. Which choice completes the text with the most logical transition?

The extensive archive of digitized handwritten letters from nineteenth-century abolitionist societies, preserved across several university repositories, ______ scholars unprecedented insight into the decentralized grassroots organizing networks that operated the Underground Railroad. Which choice completes the text so that it conforms to the conventions of Standard English?

Having analyzed high-resolution infrared spectrometry data from the James Webb Space Telescope for over six months, ______ Which choice completes the text so that it conforms to the conventions of Standard English?

A community theater group produces a musical with fixed venue rental and set construction costs of $2,200. Each ticket for an adult costs $25, and each ticket for a student costs $15. If the theater group sells 140 total tickets and wants to generate a profit of at least $600 after covering all costs, what is the minimum number of adult tickets that must be sold?

Consider the system of two linear equations shown below, where c is a constant: 6x - 9y = 14 4x + cy = -7 If the system has no solution, what is the value of c?

The population of a certain fish species in a freshwater lake t years after its initial introduction is modeled by the function P(t) = 6,400(0.49)^(t/2). Which of the following equivalent expressions displays the annual factor of population change as the base in the model?

What is the sum of all real solutions to the equation below? (x + 2)/(x - 3) = 10/(x² - 9) + 2

The polynomial function p is defined by p(x) = 2x³ - 5x² - 4x + k, where k is an integer constant. If (x - 3) is a factor of p(x), what is the value of p(1)?

A university health center conducted a clinical study on 200 participants testing a new allergen immunotherapy regimen. The results are summarized in the two-way table below: Group | Reported Significant Relief | Reported No Significant Relief | Total Treatment Group | 84 | 16 | 100 Placebo Group | 36 | 64 | 100 Total | 120 | 80 | 200 If a participant who reported significant symptom relief is selected at random, what is the probability that the participant was in the treatment group?

A civic research institute surveyed a random sample of 1,200 registered voters in a city regarding a proposed public transit bond initiative. Of the respondents, 54% reported that they supported the bond initiative. The survey reported a margin of error of ±2.8% at a 95% confidence level. Which of the following conclusions is most strongly supported by the survey results?

In the xy-plane, the equation of a circle is x² + y² - 12x + 8y + 3 = 0. What is the radius of the circle?