PSAT Reading and Writing Quiz: Central Ideas And Details
20 questions · exam conditions
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Central Ideas And DetailsQuestion 1 of 20

Read the following text, then answer the question:

In the 1840s, the photographer Anna Atkins used a process called cyanotype to make images of seaweed specimens. She placed the plants directly on light-sensitive paper and exposed them to sunlight, producing white silhouettes on a deep blue background. Although later photographers favored cameras and lenses, Atkins's method suited her scientific purpose because it recorded fine edges without requiring drawing skill. Her book of these prints is sometimes described as an early photo-illustrated work, but its intent was meticulous documentation.

According to the text, how did Atkins create her cyanotype images?

She traced seaweed by hand onto blue-tinted paper.
She placed specimens on treated paper and exposed it to sunlight.
She photographed specimens with a camera and developed the film.
She painted silhouettes using dye extracted from seaweed.
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PSAT Reading and Writing Quiz

PSAT Reading and Writing Quiz: Central Ideas And Details

Practice Central Ideas And Details in PSAT Reading and Writing with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Central Ideas And Details, giving you a quick way to practice the rules, question types, and explanations that matter most for PSAT Reading and Writing.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Read the following text, then answer the question:

In the 1840s, the photographer Anna Atkins used a process called cyanotype to make images of seaweed specimens. She placed the plants directly on light-sensitive paper and exposed them to sunlight, producing white silhouettes on a deep blue background. Although later photographers favored cameras and lenses, Atkins's method suited her scientific purpose because it recorded fine edges without requiring drawing skill. Her book of these prints is sometimes described as an early photo-illustrated work, but its intent was meticulous documentation.

According to the text, how did Atkins create her cyanotype images?

  1. She traced seaweed by hand onto blue-tinted paper.
  2. She placed specimens on treated paper and exposed it to sunlight. (correct answer)
  3. She photographed specimens with a camera and developed the film.
  4. She painted silhouettes using dye extracted from seaweed.
Explanation: The passage clearly describes Atkins's cyanotype process in the second sentence: 'She placed the plants directly on light-sensitive paper and exposed them to sunlight, producing white silhouettes on a deep blue background.' This direct placement method is explicitly contrasted with later photographers who 'favored cameras and lenses,' ruling out choice C. The text makes no mention of hand-tracing, painting, or using seaweed-extracted dyes, eliminating the other options. When answering detail questions, stick closely to what the passage explicitly states rather than making assumptions about historical photographic techniques.

Question 2

Read the text and answer the question:

In the 1890s, librarian Aria Bell began keeping a "request ledger" to record what patrons asked for and what the library lacked. The notebook notes many small fixes—repairing torn atlases, extending Sunday hours in winter, and adding lamps near the reading tables—but Bell's entries return repeatedly to a larger aim: making the collection reflect the city's changing workforce. She wrote that new technical manuals mattered not because they were fashionable, but because apprentices needed them after long shifts. When a donor offered rare poetry volumes, Bell accepted them, yet she still urged the board to budget for practical texts.

Which choice best states the main idea of the text?

  1. Bell modernized the library primarily by improving lighting and winter hours.
  2. Bell used patron requests to align the library's collection with community needs. (correct answer)
  3. Bell preferred technical manuals because poetry volumes were less valuable.
  4. Bell's request ledger became famous for documenting rare donations to the library.
Explanation: The central idea of the text is that librarian Aria Bell used a request ledger to track patron needs and align the library's collection with the community's evolving workforce demands. The passage describes the ledger's role in noting small fixes like lighting and hours, but it repeatedly emphasizes Bell's focus on acquiring practical texts, such as technical manuals for apprentices, while still accepting but deprioritizing less essential donations like poetry volumes. This scope shows how the text builds from specific examples to illustrate Bell's broader goal of making the library more relevant to users' daily lives. A key distractor is choice A, which highlights minor improvements like lighting and hours, but these are presented as small fixes rather than the text's main emphasis on adapting the collection to community needs. In central idea questions, ask yourself what the author returns to repeatedly—that's usually the central idea, not the supporting details.

Question 3

Read the following text, then answer the question:

Some urban planners argue that "green roofs" are valuable less for their appearance than for their hidden work. A layer of soil and plants can slow stormwater runoff, easing pressure on sewers during heavy rain. In summer, the same roof can reduce indoor cooling demands by shading the building and releasing moisture into the air. Though birds and insects may also benefit, the planners emphasize that the strongest case for green roofs is practical: they make dense cities function more smoothly.

Which choice best describes what the text is mainly about?

  1. Green roofs are promoted mainly for practical benefits in dense cities. (correct answer)
  2. Green roofs are most valuable because they attract birds and insects.
  3. Urban planners prefer green roofs because they look better than gravel.
  4. Cities should replace sewer systems with rooftop gardens whenever possible.
Explanation: The passage centers on urban planners' argument that green roofs are valuable primarily for their practical functions rather than their appearance. The text details specific practical benefits: managing stormwater runoff to ease sewer pressure and reducing cooling demands through shading and moisture release. While the passage mentions that birds and insects may benefit, it emphasizes that planners make their strongest case based on how green roofs help dense cities function more smoothly. Choice A correctly identifies this focus on practical benefits in urban settings, while other choices either overstate minor details or make claims not supported by the text.

Question 4

Read the text and answer the question: A researcher studying sleep describes a "first-night effect": when people sleep in a new place, they often wake more easily and spend less time in deep sleep. The researcher compares the brain to a night watch, noting that one hemisphere may remain slightly more alert. Hotels try to counter this with familiar scents and consistent lighting, though the researcher says such comforts cannot fully override novelty. Interestingly, the effect diminishes on subsequent nights even if the room is the same.

Based on the text, which choice best describes the "first-night effect"?

  1. Sleeping in a new place often leads to lighter, more easily disrupted sleep. (correct answer)
  2. Sleeping longer on the first night helps people adapt to new rooms.
  3. New hotel lighting causes people to enter deeper sleep more quickly.
  4. Familiar scents completely eliminate sleep disruption in unfamiliar places.
Explanation: The text defines the 'first-night effect' as when 'people sleep in a new place, they often wake more easily and spend less time in deep sleep,' with the brain keeping 'one hemisphere...slightly more alert.' This matches choice A's description of lighter, more easily disrupted sleep. Choice B contradicts the text—people sleep worse, not longer, on the first night. Choice C incorrectly suggests deeper sleep, opposite of what occurs. Choice D overstates the effectiveness of familiar scents, which the text says 'cannot fully override novelty.' When a passage defines a specific term or concept, the correct answer will closely paraphrase that definition.

Question 5

Read the following text, then answer the question:

The novelist wrote in her journal that she feared critics would misunderstand her new book as a simple mystery. While the plot does involve a missing heirloom and a suspicious neighbor, she considered those elements "handles" for the reader, not the point of the story. What mattered to her was how the narrator's voice changes as trust erodes within a family. Even the final reveal, she noted, was designed less to surprise than to show what the characters had been unwilling to admit.

Which choice best states the main idea of the text?

  1. The author wanted readers to focus on shifting relationships, not just the mystery plot. (correct answer)
  2. The author believed critics would praise the book's surprising final reveal.
  3. The author explained how to write a mystery using an heirloom and neighbor.
  4. The author argued that family trust always collapses when objects go missing.
Explanation: The passage reveals the novelist's concern that critics would misinterpret her book as a simple mystery when she intended something deeper. She explicitly considers the mystery elements (missing heirloom, suspicious neighbor) as mere 'handles' for readers, not the story's point. What truly mattered to her was 'how the narrator's voice changes as trust erodes within a family' - focusing on shifting relationships and character development. Even the final reveal was designed to show character psychology rather than surprise readers. Choice A correctly identifies this emphasis on relationships over plot, while other choices misrepresent or overstate aspects of the author's intent.

Question 6

Read the text and answer the question:

A research team studying urban heat placed temperature sensors on three city blocks: one lined with mature trees, one dominated by asphalt parking lots, and one with a mix of grass and low shrubs. At noon in July, the asphalt block averaged 4°C hotter than the mixed block and 7°C hotter than the tree-lined block. The team cautioned that wind and shade patterns can shift hourly, but they still argued that surface type strongly influences local temperature. They recommended planting trees first where pedestrians wait longest, such as bus stops.

According to the text, what was the average temperature difference between the asphalt block and the tree-lined block at noon in July?

  1. It was 4°C hotter on the asphalt block.
  2. It was 7°C hotter on the asphalt block. (correct answer)
  3. It was 4°C cooler on the asphalt block.
  4. It was 7°C cooler on the asphalt block.
Explanation: The requested information about the temperature difference between the asphalt block and the tree-lined block appears in the second sentence of the text, which details the noon measurements in July. The text states that 'the asphalt block averaged 4°C hotter than the mixed block and 7°C hotter than the tree-lined block,' directly supporting that it was 7°C hotter on the asphalt block. Choices A and C confuse the 4°C difference with the mixed block for the tree-lined one, while choice D incorrectly reverses the comparison to suggest the asphalt was cooler. In detail questions, the correct answer will always be directly stated or clearly paraphrased from the passage—eliminate answers that mix up specific comparisons or reverse the stated relationships.

Question 7

Read the following text, then answer the question:

In a study of sleep and memory, researchers asked volunteers to learn pairs of unrelated words at 9 p.m. One group then slept for eight hours, while another stayed awake in a dim room doing quiet activities. The next morning, the sleepers recalled more pairs, but the researchers cautioned that sleep was not "magic": participants who practiced longer initially also improved, regardless of group. Still, the clearest difference appeared when the word pairs were especially hard, suggesting that sleep helps stabilize fragile learning.

According to the text, when was the word-pair learning task assigned?

  1. At 9 p.m. (correct answer)
  2. At midnight
  3. The next morning
  4. After eight hours of sleep
Explanation: The text explicitly states in the first sentence that 'researchers asked volunteers to learn pairs of unrelated words at 9 p.m.' This timing is clearly specified before the text describes how one group then slept while another stayed awake. The other time references in the passage - midnight, the next morning, and after eight hours of sleep - all relate to different parts of the experiment, not when the initial learning task was assigned. In detail questions like this, the correct answer will always be directly stated in the passage, so careful reading of the specific information requested is essential.

Question 8

Read the text and answer the question:

In her memoir, a violinist describes practicing the same eight measures for an hour, not to increase speed but to change the sound's "color." She experiments with bow pressure, then with where the bow meets the string, and finally with tiny shifts in vibrato. A friend suggests that such repetition is a sign of perfectionism, yet the violinist disagrees: she calls it "listening practice," because each attempt teaches her what she can control. Later, she applies the same method to a whole concerto, but she notes that the method works only when she stays curious rather than judgmental. The memoir portrays mastery as a product of attentive experimentation.

Which choice best states the main idea of the text?

  1. The violinist believes careful, curious repetition develops musical control and mastery. (correct answer)
  2. The violinist's friend thinks practicing the same passage suggests unhealthy perfectionism.
  3. Changing vibrato matters more than bow pressure for improving a violin's tone.
  4. Learning an entire concerto requires far more time than practicing short passages.
Explanation: The passage centers on the violinist's philosophy that mastery comes from "attentive experimentation"—practicing with curiosity and careful observation rather than mindless repetition. The text develops this idea by describing her methodical approach to changing a passage's "color" through various techniques, her defense of this method as "listening practice" that teaches control, and her emphasis on staying curious rather than judgmental. Choice B only captures the friend's perspective, not the main idea. Choice C presents a detail about technique but misses the broader point about practice philosophy. Choice D makes an unsupported comparison about time requirements. The correct answer captures both the violinist's method and her underlying belief about how mastery develops.

Question 9

Read the following text, then answer the question:

Economists sometimes describe "network effects" by pointing to a simple pattern: a product becomes more useful as more people use it. A phone is not very helpful if only one person owns one, but its value rises as contacts join the network. The same logic can apply to software formats, where widespread adoption encourages developers to build compatible tools. Still, the text notes that network effects do not guarantee quality; a popular system may persist even if alternatives are technically better.

Which choice best describes what the text is mainly about?

  1. Network effects explain why usefulness can grow with wider adoption. (correct answer)
  2. Phones are more valuable than software because they connect people directly.
  3. Technically superior products always replace popular but inferior systems.
  4. Developers create tools only when economists study software formats.
Explanation: The passage explains the economic concept of 'network effects' - how products become more useful as more people adopt them. The text uses phones as a clear example (more valuable with more users) and extends this to software formats, where widespread adoption encourages compatible tool development. Importantly, the passage notes that network effects don't guarantee quality, as popular systems may persist even when better alternatives exist. Choice A accurately captures this explanation of how usefulness grows with adoption, while other choices either make unsupported comparisons or claims not found in the text.

Question 10

Read the text and answer the question:

During a 1930s expedition, botanist Ynes Mexia collected plant specimens along roadsides, riverbanks, and steep canyons, often shipping pressed samples to multiple herbaria so that researchers in different countries could study them. Although she sometimes traveled with guides, she wrote that the most difficult moments were the solitary ones: labeling each specimen precisely before the details faded from memory. Later biographers focused on the sheer number of her collections, but Mexia's own notes stressed method—consistent labeling, duplicate sets, and careful location descriptions. Her approach helped later scientists verify identifications and compare ecosystems across regions.

Which choice best describes what the text is mainly about?

  1. Mexia argues that guides are essential for safe travel in remote canyons.
  2. Mexia's biographers emphasize adventure more than the scientific value of her work.
  3. Mexia highlights careful documentation as central to the usefulness of her collections. (correct answer)
  4. Mexia collected most of her specimens from roadsides rather than difficult terrain.
Explanation: The passage emphasizes Mexia's methodical approach to botanical collecting, particularly her careful documentation practices—"labeling each specimen precisely," creating "duplicate sets," and providing "careful location descriptions." The text develops this central idea by contrasting what Mexia herself valued (consistent method and documentation) with what later biographers focused on (the quantity of collections). Choice A about guides is a minor detail. Choice B reverses the emphasis—biographers focused on numbers, not adventure. Choice D misrepresents the text, which mentions multiple terrains including "steep canyons," not primarily roadsides. The passage consistently returns to the importance of Mexia's systematic documentation for enabling future scientific work.

Question 11

Read the text and answer the question:

When the composer Lina Cho moved to a coastal town, she expected the sea to dominate her work, and her early sketches did imitate wave patterns. Yet her finished suite surprised listeners: its most persistent motif came from the shipyard's daily whistle, which sounded at uneven intervals when fog rolled in. Cho explained in an interview that the ocean was "too continuous" to translate easily into melody, while the whistle offered sharp starts and stops she could shape into rhythm. She still titled the suite Tide Charts, partly to misdirect and partly to honor her first assumption.

Which choice best describes what the text is mainly about?

  1. Cho's suite was inspired more by a shipyard whistle than by the sea. (correct answer)
  2. Cho titled her suite to confuse listeners about its musical structure.
  3. Coastal fog made it difficult for Cho to complete her early sketches.
  4. Wave patterns are easier than whistles to translate into melody.
Explanation: The central idea of the text is that composer Lina Cho's suite was ultimately inspired more by a shipyard whistle than by the sea, despite her initial expectations and the work's title. The passage begins with Cho's move to a coastal town and her early sketches imitating waves, but it shifts to explain how the whistle's sharp, uneven sounds provided a better rhythmic motif than the ocean's continuity, leading to the finished piece. This scope highlights the contrast between her assumptions and the actual creative process, culminating in her choice of a misleading title to honor that journey. A key distractor is choice B, which misinterprets the title as an attempt to confuse listeners about structure, when the text specifies it was partly to misdirect and partly to acknowledge her first ideas. In central idea questions, focus on the passage's overall progression and surprises—that often reveals the main point beyond initial details.

Question 12

Read the text and answer the question:

A researcher explains that some desert seeds remain dormant for years, waiting for a rare sequence of conditions. A brief rain may be insufficient if it is followed by hot winds that dry the soil within a day, but a longer storm that keeps the ground moist for several days can trigger germination. The researcher adds that temperature matters too: certain seeds sprout only when cool nights follow warm days, a pattern common in early spring. Although animals can disperse the seeds, dispersal alone does not determine when plants appear. The text emphasizes dormancy as a strategy for surviving unpredictable rainfall.

Which choice best states the main idea of the text?

  1. Desert plants rely on animals to spread seeds across large distances.
  2. Desert seeds use dormancy to time germination to favorable moisture conditions. (correct answer)
  3. Hot winds are the most common cause of plant failure after rainstorms.
  4. Early spring is the only season in which desert plants can germinate.
Explanation: The passage explains how desert plants use seed dormancy as a survival strategy, waiting for specific moisture conditions before germinating rather than sprouting after any rainfall. The text develops this main idea by detailing the precise conditions needed (extended moisture, not just brief rain) and additional factors like temperature patterns, while clarifying that seed dispersal doesn't control timing. Choice A focuses on a minor detail about animal dispersal. Choice C misidentifies hot winds as a cause of plant failure rather than a condition preventing germination. Choice D incorrectly limits germination to one season when the text only says the temperature pattern is "common" in early spring. For central idea questions, ask what concept the passage spends the most time explaining—here, it's dormancy as an adaptive strategy.

Question 13

Read the text and answer the question:

A biographer describes how engineer Keiko Tanaka approached setbacks during the 1964 bridge project. When a supplier delivered steel beams with minor flaws, Tanaka did not halt construction indefinitely; she reassigned crews to pour concrete supports while negotiating replacements. Later, when high winds delayed cable installation, she used the downtime to run additional safety drills and revise the maintenance manual. The biographer notes Tanaka's technical skill, but emphasizes even more her habit of turning delays into productive work rather than treating them as pure losses.

Which choice best describes what the text is mainly about?

  1. Tanaka's bridge design succeeded mainly because the weather improved quickly.
  2. Tanaka responded to setbacks by redirecting work to keep the project moving. (correct answer)
  3. Tanaka's crews preferred pouring concrete supports over installing cables.
  4. Tanaka wrote a maintenance manual that became a national safety standard.
Explanation: The central idea of the text is that engineer Keiko Tanaka responded to setbacks during a bridge project by redirecting work and turning delays into productive opportunities, a habit emphasized by her biographer. The passage details specific examples, such as reassigning crews during steel flaws and using wind delays for safety drills and manual revisions, highlighting her adaptive approach over pure technical skill. This scope builds from individual incidents to the biographer's broader praise for her mindset in managing obstacles. A key distractor is choice A, which attributes success mainly to improved weather, but the text focuses on Tanaka's proactive responses rather than external factors like weather. In central idea questions, pay attention to what the biographer or narrator emphasizes—that usually signals the main point beyond the events themselves.

Question 14

Read the following text, then answer the question:

When the city library renovated its main hall, it did not simply add more shelves. Staff members moved the reference desk closer to the entrance so first-time visitors could ask questions without crossing the entire room. They also replaced a silent study area with smaller rooms that could be reserved for tutoring, arguing that quiet can exist alongside collaboration if spaces are clearly separated. The renovation's goal, the director wrote, was to make the building easier to use rather than more impressive to look at.

Which choice best states the main idea of the text?

  1. The renovation aimed to improve usability by reorganizing spaces for patrons. (correct answer)
  2. The library renovation focused on adding shelves to expand the collection.
  3. The director believed tutoring should replace all silent study in libraries.
  4. Moving the reference desk proved more impressive than changing the hall's design.
Explanation: The passage describes a library renovation focused on improving usability and patron experience rather than simply expanding the collection. The text provides specific examples: moving the reference desk closer to the entrance for easier access and replacing silent study areas with reservable rooms for tutoring. The director explicitly stated the goal was 'to make the building easier to use rather than more impressive to look at,' which directly supports choice A's emphasis on reorganizing spaces for patron usability. Choices B and D contradict the passage's stated goals, while C overstates the tutoring room addition as a complete replacement philosophy.

Question 15

Read the text and answer the question:

In 1978, journalist Mateo Ríos wrote a series of articles about a river that had become unsafe for fishing. Many readers remember the dramatic opening scene—Ríos describing a silvery film on the water at dawn—but his reporting focused less on imagery than on tracing responsibility. He compared factory discharge records from 1971 and 1976, interviewed inspectors who admitted they lacked staff, and printed a map showing which neighborhoods relied most on the river for food. After the series ran, the city council held hearings, though new regulations took two more years to pass.

Which choice best states the main idea of the text?

  1. Ríos's writing is remembered mainly for its vivid descriptions of polluted water.
  2. Ríos used multiple forms of evidence to assign accountability for river pollution. (correct answer)
  3. City council hearings quickly solved the problem of unsafe fishing in the river.
  4. Factory discharge records from 1971 proved more accurate than those from 1976.
Explanation: The central idea of the text is that journalist Mateo Ríos used multiple forms of evidence in his articles to trace and assign accountability for river pollution, beyond just vivid descriptions. The passage notes a memorable opening scene but emphasizes his focus on comparing factory records, interviewing inspectors, and mapping affected neighborhoods, which contributed to city council hearings. This scope shows how the text moves from readers' recollections to the substantive reporting that drove action, even if regulations were delayed. A key distractor is choice A, which focuses on the dramatic imagery of polluted water, but this is presented as a minor, remembered detail rather than the main thrust of his evidence-based approach. In central idea questions, identify what the author spent the most space developing—that's usually the central idea, not the interesting details along the way.

Question 16

Read the text and answer the question:

A city's transit department introduced a fare-free bus route to reduce downtown traffic. In the first month, ridership increased sharply, and surveys showed many riders were students traveling between campuses. However, traffic counts on nearby streets fell only slightly, partly because delivery trucks and ride-share vehicles still dominated peak hours. The department argued that the route's success should be measured not only by car reduction but also by improved access to jobs and clinics. It proposed adding evening service next, when workers without cars reported the greatest difficulty traveling.

Which choice best describes what the text is mainly about?

  1. The fare-free route failed because traffic did not decrease immediately.
  2. The department evaluates the route using access benefits as well as traffic data. (correct answer)
  3. Students were the only group that used the fare-free bus route.
  4. Delivery trucks increased because buses were made free to ride.
Explanation: The central idea of the text is that the city's transit department introduced a fare-free bus route and evaluates its success using both traffic reduction data and broader access benefits, despite limited immediate impact on congestion. The passage details the route's implementation, ridership increase among students, slight traffic drop, and the department's argument for measuring success through improved job and clinic access, leading to proposals for evening service. This scope illustrates the text's focus on a multifaceted evaluation rather than declaring failure based on one metric. A key distractor is choice A, which claims the route failed due to no immediate traffic decrease, but the text counters this by emphasizing alternative success measures and future expansions. In central idea questions, consider the author's perspective and recommendations—that often points to the main idea beyond surface-level outcomes.

Question 17

Read the text and answer the question: A museum curator explains that the blue pigment in many medieval manuscripts did not come from local plants but from lapis lazuli, a stone mined primarily in what is now Afghanistan. Because the stone traveled along long trade routes, a single page of illumination could contain material more expensive than the parchment it covered. The curator adds that red inks often came from insects and that gold leaf was applied in thin sheets, yet visitors tend to remember only the vivid blue. The point, she says, is that color can reveal hidden economic networks.

According to the text, where did the blue pigment in many medieval manuscripts primarily originate?

  1. From lapis lazuli mined in what is now Afghanistan. (correct answer)
  2. From local plants grown near European monasteries.
  3. From insects used to produce red inks.
  4. From gold leaf hammered into thin sheets.
Explanation: The text explicitly states that 'the blue pigment in many medieval manuscripts did not come from local plants but from lapis lazuli, a stone mined primarily in what is now Afghanistan.' This directly supports choice A. Choice B is explicitly contradicted—the text says the pigment did NOT come from local plants. Choices C and D confuse blue pigment with other materials mentioned (red inks from insects, gold leaf) but the question specifically asks about blue pigment. In detail questions, focus on exactly what the question asks for and find where that specific information appears in the passage.

Question 18

Read the text and answer the question:

In 1913, engineer Emily Warren Roebling wrote that her most demanding work on the Brooklyn Bridge was not the calculations but the daily translation between specialists: she explained the chief engineer's plans to politicians, and she summarized city inspectors' concerns back to the work crews. Newspapers sometimes praised her "heroic" presence on the site, yet she insisted that steady correspondence and clear reports mattered more than spectacle. She also noted that earlier bridge projects in 1869 and 1876 had stalled when miscommunication multiplied small errors. Roebling's account argues that large public works succeed when information moves reliably among people with different expertise.

Which choice best states the main idea of the text?

  1. Newspapers shaped public perceptions of engineering by celebrating dramatic on-site leadership.
  2. Bridge projects in the late nineteenth century often failed because calculations were too complex.
  3. Roebling argues that clear communication is essential to completing major infrastructure projects. (correct answer)
  4. Roebling's main contribution to the Brooklyn Bridge was performing technical mathematical analyses.
Explanation: The passage focuses on Emily Warren Roebling's work on the Brooklyn Bridge, emphasizing that her most important contribution was facilitating communication between different groups—translating between engineers, politicians, and work crews. The text develops this central idea by contrasting what newspapers praised (her "heroic" on-site presence) with what Roebling herself valued (correspondence and clear reports), and by noting how earlier projects failed due to miscommunication. Choice A incorrectly focuses on newspapers and dramatic leadership, which the passage actually contradicts. Choice B misrepresents the passage—it mentions earlier bridge failures due to miscommunication, not calculation complexity. Choice D is wrong because the passage explicitly states her most demanding work was "not the calculations but the daily translation between specialists."

Question 19

Read the text and answer the question:

In a museum storage room, conservators compared two varnishes for a 1912 oil painting: a traditional resin varnish and a newer synthetic one. Both restored color saturation at first, but after six months under controlled light, the resin sample yellowed slightly while the synthetic sample stayed clearer. The team noted that the synthetic varnish is harder to remove, which could complicate future restoration, and they also cautioned that the test used a small painted panel rather than the original artwork. Even so, they recommended the synthetic varnish for paintings displayed in bright galleries.

The text indicates that the conservators recommended the synthetic varnish primarily because it

  1. was easier to remove during future restoration.
  2. reduced yellowing under controlled light over six months. (correct answer)
  3. matched the original artwork better than the test panel.
  4. increased color saturation more than the resin varnish.
Explanation: The information about why the conservators recommended the synthetic varnish appears in the second and fourth sentences, where the text compares the varnishes' performance over time and states the recommendation for bright galleries. The text explains that 'after six months under controlled light, the resin sample yellowed slightly while the synthetic sample stayed clearer,' indicating reduced yellowing as the primary reason. Choices A and C misread details, as the synthetic is actually harder to remove and the test was on a panel, not guaranteeing a better match to the original; choice D confuses the initial equal restoration of saturation with long-term effects. In detail questions, watch for answer choices that mix accurate details from different parts of the passage in misleading ways, such as conflating short-term and long-term outcomes.

Question 20

Read the following text, then answer the question:

A marine biologist studying kelp forests tagged sea otters to see how their movements affected local ecosystems. In coves where otters hunted frequently, sea urchin numbers dropped, and kelp grew taller and denser. In nearby areas with few otters, urchins grazed heavily, leaving bare patches of rock. The biologist warned that storms and water temperature also influence kelp growth, but the contrast between coves suggested that predators can indirectly shape plant communities through their prey.

Based on the text, which choice best describes what happened in coves where otters hunted frequently?

  1. Sea urchin numbers decreased and kelp became taller and denser. (correct answer)
  2. Sea urchin numbers increased and kelp became taller and denser.
  3. Sea urchin numbers decreased and kelp was replaced by bare rock.
  4. Sea urchin numbers increased and kelp was replaced by bare rock.
Explanation: The passage explicitly states that 'In coves where otters hunted frequently, sea urchin numbers dropped, and kelp grew taller and denser.' This is directly contrasted with areas having few otters, where 'urchins grazed heavily, leaving bare patches of rock.' The text presents this as evidence of how predators (otters) can indirectly shape plant communities (kelp) through their prey (sea urchins). Choice A correctly identifies both outcomes: decreased sea urchin numbers and taller, denser kelp. Watch for answer choices that mix accurate details incorrectly - choices B and D reverse one of the two outcomes stated in the passage.