GRE Quiz: Resolve Paradox Discrepancy

What this quiz covers

This quiz focuses on Resolve Paradox Discrepancy, giving you a quick way to practice the rules, question types, and explanations that matter most for GRE.

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.

Question 1

1. Participants sometimes underreport how much coffee they drink because they consider caffeine consumption unhealthy.
2. Coffee can have different effects on different individuals depending on genetic factors.
3. Coffee drinkers' higher attention scores were largely attributable to their ability to nap and to schedule demanding tasks at times when they felt most alert, offsetting the effects of slightly less nighttime sleep. (correct answer)
4. The attention test used in the study has been validated in multiple prior experiments.
5. Participants who avoided afternoon coffee tended to drink more tea in the morning than coffee drinkers did.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the shorter sleep time among afternoon coffee drinkers and their higher attention scores. The correct answer explains that coffee drinkers used naps and flexible schedules to offset sleep loss, improving attention despite less nighttime sleep. This accounts for the sleep reduction by allowing caffeine's disruptive effect, while adaptive behaviors explain better performance. Thus, it resolves the paradox by introducing compensating strategies that enhance alertness. In contrast, choice A addresses underreporting but fails to explain higher scores with less sleep. Similarly, choice B notes individual differences but does not reconcile the group-level sleep and attention findings.

Question 2

1. Employees often prefer having a three-day weekend to having a higher salary.
2. Added documentation requirements and time spent training new hires reduced time available for project completion, lowering output despite improved morale under the four-day schedule. (correct answer)
3. The company's clients became more demanding about project quality in recent years.
4. Some employees used their extra day off to pursue hobbies and personal projects.
5. The company's managers held more meetings after the policy change to discuss the transition.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the higher satisfaction from the four-day week and the decline in output. The correct answer explains that new documentation and training reduced project time, lowering output despite morale gains. This accounts for the schedule's benefits by allowing better well-being, while added tasks explain reduced productivity. Thus, it resolves the paradox by introducing confounding workload changes. In contrast, choice A addresses preferences but fails to explain falling output with satisfaction. Similarly, choice D notes personal use but does not reconcile improved morale with lower projects completed.

Question 3

1. Chat platforms can make it easier for employees to contact colleagues in other departments.
2. Teams shifted decision-making into chat conversations that were not consistently transferred into the formal project-management system, increasing message volume while decreasing documented decisions. (correct answer)
3. Some employees dislike project-management software because it requires learning a new interface.
4. The company's managers held fewer in-person meetings after adopting the chat platform.
5. The project-management software vendor released several updates during the period studied.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the increased messages from the chat platform and the decline in documented decisions. The correct answer explains that decisions shifted to undocumented chat, boosting messages but reducing formal records. This accounts for the encouragement's effect by allowing more communication, while tool usage explains fewer documentations. Thus, it resolves the paradox by showing a medium shift. In contrast, choice A addresses connectivity but fails to explain declining decisions with more messages. Similarly, choice C notes dislikes but does not reconcile increased communication with reduced documentation.

Question 4

1. The redesigned checkout flow used larger fonts and fewer form fields.
2. An influx of less-qualified visitors from advertising and a shift in purchases toward discounted low-margin items could reduce revenue per visitor even if checkout completion among payment-page visitors improved. (correct answer)
3. Cart abandonment can be caused by slow shipping times.
4. Some shoppers prefer to browse on mobile devices rather than on desktop computers.
5. The retailer's customer-service team expanded its hours of operation during the period in question.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the improved checkout completion rate and the decline in revenue per visitor. The correct answer explains that less-qualified visitors and low-margin purchases reduced revenue despite better conversions. This accounts for the redesign's efficacy by allowing fewer abandonments, while traffic and product shifts explain lower revenue. Thus, it resolves the paradox by introducing changes in visitor quality and behavior. In contrast, choice A addresses design features but fails to explain revenue decline with higher completions. Similarly, choice C notes abandonment causes but does not reconcile the improvement with falling revenue.

Question 5

1. Cholesterol levels are only one of many risk factors for heart attacks.
2. The claims data included patients with higher baseline risk and higher discontinuation rates on the new drug, which could offset the drug's cholesterol-lowering advantage when comparing heart-attack outcomes. (correct answer)
3. The older drug has been on the market longer and is therefore more familiar to physicians.
4. The clinical trial used a double-blind design, whereas the insurance analysis was observational.
5. Some patients prefer taking a single pill rather than multiple pills each day.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the new drug's superior cholesterol reduction in trials and the lack of heart-attack rate improvement in claims data. The correct answer explains that higher baseline risk and discontinuation rates in claims patients offset the drug's benefits. This accounts for the trial efficacy by allowing controlled settings showed advantages, while real-world factors explain similar outcomes. Thus, it resolves the paradox by highlighting selection and adherence differences. In contrast, choice A notes multiple risk factors but fails to explain why outcomes did not differ despite better cholesterol control. Similarly, choice C addresses familiarity but does not reconcile the efficacy discrepancy.

Question 6

1. NO$_2$ levels can vary from day to day due to changes in humidity and temperature.
2. The app's interface was redesigned to be more visually appealing shortly after launch.
3. Reducing general parking spaces increased the amount of idling and stop-and-go behavior from delivery vehicles and drivers searching on adjacent streets, raising NO$_2$ despite slightly faster average speeds on instrumented streets. (correct answer)
4. Drivers who use parking apps tend to be more comfortable with smartphone navigation than drivers who do not.
5. Average vehicle speed is a useful metric for evaluating traffic congestion in many cities.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the slight increase in vehicle speed and the rise in NO₂ concentrations. The correct answer explains that reduced parking spaces increased idling and stop-and-go from delivery vehicles and searchers, raising NO₂ despite faster speeds on monitored streets. This accounts for the app's traffic benefits by allowing improved flow in some areas, while parking changes explain the pollution increase. Thus, it resolves the paradox by showing pollution rose from unmonitored behaviors offsetting speed gains. In contrast, choice A addresses NO₂ variability but fails to explain the specific rise alongside speed improvements. Similarly, choice E affirms speed as a metric but does not reconcile it with higher pollution.

Question 7

1. Some passengers board more quickly when they travel without carry-on luggage.
2. Reducing buffer time and increasing operations at a congested hub can negate improvements in turnaround by leaving less slack to absorb delays unrelated to boarding. (correct answer)
3. The new boarding procedure was unpopular with some frequent flyers.
4. On-time departure rates can be influenced by weather conditions.
5. The airline's planes are serviced by the same ground crew contractors as before.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the reduced turnaround time from the new procedure and the unchanged on-time departure rate. The correct answer explains that less buffer time and congested hub operations absorbed the time savings without improving departures. This accounts for the procedure's efficiency by allowing faster turnarounds, while scheduling changes explain no net gain. Thus, it resolves the paradox by showing offsets from other policies. In contrast, choice A addresses boarding speed but fails to explain stable departure rates. Similarly, choice D notes weather but does not reconcile the turnaround improvement with unchanged on-time performance.

Question 8

1. The herbivores that remained in the park shifted their feeding to young trees in river valleys, where forage is concentrated.
2. The predator population grew more slowly than expected because of harsh winters in the park.
3. Beavers increased flooding in river valleys, which reduced seedling survival even as browsing pressure from herbivores fell. (correct answer)
4. Young trees are an important food source for many species, so a decline in young trees can affect other parts of the ecosystem.
5. The park's tree surveys used a different sampling method five years after reintroduction than they used before reintroduction.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the decline in herbivores and the unexpected decline in young tree density in river valleys. The correct answer explains that increased beaver activity caused flooding, which reduced seedling survival despite lower browsing from herbivores. This accounts for the predator's impact on herbivores by allowing reduced browsing pressure, while beaver dams explain the tree decline through a separate mechanism. Thus, it resolves the paradox by introducing an intervening factor that offsets the expected tree recovery. In contrast, choice A addresses only herbivore behavior but fails to explain why tree density declined if browsing shifted. Similarly, choice D notes broader ecosystem effects but does not reconcile the specific decline in young trees with reduced herbivores.

Question 9

1. Influenza viruses mutate frequently, requiring vaccines to be updated each year.
2. The campaign's messaging emphasized protecting vulnerable populations such as older adults.
3. Expanded surveillance and greater test availability increased detection and reporting of influenza cases, making the recorded case count higher even if true incidence did not rise proportionally. (correct answer)
4. Some residents avoid vaccines because they dislike injections.
5. Clinics sometimes run out of vaccine doses during periods of high demand.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the increased vaccination appointments from the campaign and the higher reported influenza cases. The correct answer explains that expanded surveillance and testing increased detection, raising reported cases without proportional true incidence growth. This accounts for the campaign's uptake by allowing potential prevention, while surveillance explains the case rise. Thus, it resolves the paradox by attributing the increase to better reporting. In contrast, choice A addresses mutations but fails to explain higher cases despite more vaccinations. Similarly, choice D notes avoidance reasons but does not reconcile campaign success with rising cases.

Question 10

1. Street trees can take several years to reach full canopy coverage.
2. Heat-related illness depends on population vulnerability and indoor conditions as well as outdoor temperatures, so increases in vulnerable residents without cooling can raise ER visits even if average surface temperatures fall. (correct answer)
3. Satellite measurements of surface temperature differ from measurements of air temperature taken at weather stations.
4. Some residents prefer warmer temperatures and spend more time outdoors in summer.
5. The city also repaved several major roads during the same period.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the slight decrease in surface temperatures from tree planting and the increase in heat-related ER visits. The correct answer explains that more vulnerable residents and poor indoor cooling raised visits despite cooler outdoors. This accounts for the trees' effect by allowing temperature reductions, while demographic and housing factors explain illness rises. Thus, it resolves the paradox by showing illness depends on more than temperature. In contrast, choice A addresses growth time but fails to explain rising visits with lower temperatures. Similarly, choice C notes measurement differences but does not reconcile the temperature drop with increased illnesses.

Question 11

1. Many instructors prefer printed books to digital books because printed books are easier to annotate.
2. The bookstore's revenue increase was driven largely by sales of access codes and courseware subscriptions, even as spending on traditional textbooks fell. (correct answer)
3. Some students choose not to purchase required texts even when instructors recommend them.
4. The OER policy was announced with significant publicity, which increased awareness of textbook costs.
5. The bookstore raised prices on all items, including snacks and apparel, during the same two-year period.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the OER policy's aim to reduce costs and the bookstore's revenue increase, alongside declining student out-of-pocket spending. The correct answer explains that revenue grew from access codes and courseware sales, offsetting the drop in traditional textbook spending. This accounts for the policy's success in lowering text costs by emphasizing free resources, while bundled digital sales explain the revenue rise. Thus, it resolves the paradox by showing the revenue source shifted rather than contradicting cost reductions. In contrast, choice A addresses instructor preferences but fails to explain the revenue increase or student savings. Similarly, choice E notes price hikes on non-materials but does not reconcile the specific course materials revenue with OER adoption.

Question 12

1. The upgraded lighting produces a more uniform illumination than the previous lighting system.
2. The firm's electricity supplier increased rates during the year after the upgrades.
3. The new quality-control line and extended operating hours increased total runtime of electrical equipment enough to outweigh efficiency gains. (correct answer)
4. Some employees complained that the building felt cooler after the HVAC upgrade than it had before.
5. Energy-efficient lighting typically lasts longer than older lighting technologies and therefore requires fewer bulb replacements.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the energy-efficient upgrades and the unexpected increase in electricity use. The correct answer explains that extended hours and a new quality-control line increased equipment runtime, outweighing efficiency gains. This accounts for the upgrades' potential savings by allowing they improved per-hour efficiency, while added operations explain the total use rise. Thus, it resolves the paradox by introducing increased activity that offsets the upgrades' benefits. In contrast, choice B addresses rate increases but fails to explain higher consumption itself. Similarly, choice E notes lighting longevity but does not reconcile the efficiency intent with rising bills.

Question 13

1. Tree canopy coverage can reduce surface temperatures by shading streets and buildings.
2. Residents in higher-canopy neighborhoods are more likely to own and use air conditioning extensively because they have larger homes and greater ability to pay, leading to higher electricity use despite cooler ambient temperatures. (correct answer)
3. Some residents prefer warmer indoor temperatures in summer than others do.
4. The city's utility company increased electricity rates during the summer months.
5. Low-canopy neighborhoods often have more apartment buildings than high-canopy neighborhoods do.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the lower temperatures in high-canopy neighborhoods and their higher air-conditioning electricity use. The correct answer explains that larger homes and greater AC affordability in high-canopy areas led to more usage despite cooler ambiences. This accounts for canopy cooling by allowing temperature reductions, while socioeconomic factors explain higher consumption. Thus, it resolves the paradox by introducing usage drivers independent of temperature. In contrast, choice A affirms shading benefits but fails to explain higher electricity in cooler areas. Similarly, choice C notes preferences but does not reconcile the temperature and usage discrepancy.

Question 14

1. Reference books are less frequently checked out than popular fiction books.
2. Evening workshops attracted additional patrons and encouraged group discussion in the new collaborative spaces, increasing evening crowding and noise despite reduced morning use. (correct answer)
3. Some patrons prefer studying at home rather than in a public library.
4. The renovation used durable materials designed to reduce long-term maintenance costs.
5. Noise complaints are sometimes influenced by patrons' expectations rather than by actual sound levels.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the renovation's aim to reduce noise and crowding and the increase in evening crowding and complaints. The correct answer explains that evening workshops attracted more patrons and encouraged noisy group activities, increasing evening issues despite morning reductions. This accounts for the workspace changes by allowing less morning use, while workshops explain the evening surge. Thus, it resolves the paradox by showing the contradiction stems from time-specific usage shifts. In contrast, choice A addresses checkout patterns but fails to explain noise and crowding changes. Similarly, choice C notes home preferences but does not reconcile the renovation's intent with observed increases.

Question 15

1. Some staff members reported that they preferred sanitizer to soap because it is faster to use between patient visits.
2. The new molecular test detects infections that the older culture-based test often failed to identify, increasing the number of confirmed HAIs without a true increase in underlying infections. (correct answer)
3. The hospital's infection-control team reduced the number of posters encouraging hand hygiene after the first month of the campaign.
4. Several nearby hospitals also reported increases in HAIs during the same six-month period.
5. The hand-hygiene campaign improved sanitizer use primarily in low-risk wards rather than in the intensive care unit, where most HAIs occur.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the increase in hand sanitizer use and the rise in reported hospital-acquired infections (HAIs) without negating either observation. The correct answer explains that the new molecular test detects more infections than the older culture-based test, leading to more confirmed HAIs even if actual infections did not increase. This accounts for the improved hygiene compliance by allowing that it may have prevented a true rise in infections, while the test change explains the apparent increase in HAIs. Thus, it resolves the paradox by showing that the HAI rise is due to better detection rather than worsening hygiene. In contrast, choice A addresses only staff preferences for sanitizer but fails to explain why HAIs increased despite better compliance. Similarly, choice E explains uneven sanitizer use but does not reconcile the overall hygiene improvement with rising HAIs.

Question 16

1. Students sometimes enjoy group work more than independent work.
2. The new curriculum may improve deeper understanding but, in the short term, reduced test practice and teacher unfamiliarity can lower standardized scores even as participation increases. (correct answer)
3. Standardized math tests include multiple-choice questions as well as short-answer questions.
4. Some parents prefer that schools emphasize memorization of formulas.
5. The district also updated its science curriculum during the same year.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the increased participation from the new curriculum and the slight decline in test scores. The correct answer explains that short-term factors like less test practice and teacher adjustment lowered scores despite deeper engagement. This accounts for the curriculum's benefits by allowing better understanding long-term, while transitional issues explain score drops. Thus, it resolves the paradox by highlighting temporary implementation effects. In contrast, choice A addresses enjoyment but fails to explain declining scores with more participation. Similarly, choice D notes preferences but does not reconcile engagement gains with test outcomes.

Question 17

1. Clearer water generally improves recreational opportunities such as swimming and boating.
2. The invasive mussel reduced phytoplankton, altering the food web and reducing food availability for zooplankton and small fish that native fish depend on, even as clarity increased. (correct answer)
3. Native fish populations can fluctuate naturally from year to year due to random variation in reproduction.
4. Aquatic plants provide habitat for many lake organisms, including fish.
5. The lake's water clarity was measured using a standardized instrument known as a Secchi disk.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the increased water clarity from invasive mussels and the decline in native fish populations. The correct answer explains that reduced phytoplankton altered the food web, decreasing food for fish despite clarity gains. This accounts for the mussels' filtering by allowing clearer water, while food chain effects explain fish declines. Thus, it resolves the paradox by showing indirect negative impacts. In contrast, choice A affirms recreational benefits but fails to explain fish population drops. Similarly, choice C notes fluctuations but does not reconcile clarity improvements with declines.

Question 18

1. Some households install solar panels primarily for environmental reasons rather than for financial savings.
2. Electricity consumption tends to be higher in winter than in summer in many regions.
3. Increased electricity use from heat pumps and shifting consumption to evening hours when solar output is low can offset midday reductions, leaving annual grid purchases largely unchanged. (correct answer)
4. Solar panels generate more electricity on sunny days than on cloudy days.
5. Some households without solar panels also reduced their electricity use during the year.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the midday reductions in grid purchases from solar panels and the lack of annual decline. The correct answer explains that heat pumps and evening shifts increased use when solar output is low, offsetting midday savings. This accounts for the panels' generation by allowing daytime benefits, while usage changes explain unchanged annual purchases. Thus, it resolves the paradox by introducing timing and new consumption factors. In contrast, choice A addresses motivations but fails to explain stable grid purchases despite installations. Similarly, choice B notes seasonal consumption but does not reconcile midday drops with annual stability.

Question 19

1. Some users prefer learning languages through in-person classes rather than through apps.
2. The gamified feature attracted more frequent but more superficial practice, increasing daily activity while reducing time spent on higher-impact modules that drive test gains. (correct answer)
3. Standardized proficiency tests can be stressful for some test-takers.
4. The app expanded to new countries and added additional interface languages.
5. The app's point system was redesigned twice in the first month after launch.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the increase in daily active users from gamification and the slight decrease in proficiency test improvements. The correct answer explains that gamification led to superficial practice, boosting activity but reducing engagement with impactful modules. This accounts for user growth by allowing appealing quick exercises, while module shifts explain lower gains. Thus, it resolves the paradox by showing quantity over quality in practice. In contrast, choice A addresses preferences but fails to explain declining improvements with more users. Similarly, choice C notes test stress but does not reconcile increased activity with worse outcomes.

Question 20

1. Some visitors prefer museums that allow them to enter at any time without advance planning.
2. The museum shop expanded its selection of souvenirs during the period in question.
3. Coordinating multiple timed reservations encouraged visitors to follow a tighter schedule and leave sooner, even though the galleries felt less crowded. (correct answer)
4. Visitors who spend less time in a museum tend to view fewer artworks.
5. The temporary exhibit was reviewed favorably by local newspapers.

Explanation: This question tests the ability to resolve a paradox by identifying an explanation that reconciles two seemingly contradictory facts. Paradox questions require finding a choice that accounts for both the reduced crowding perception from timed tickets and the decrease in average visit time. The correct answer explains that multiple reservations encouraged tighter schedules and earlier departures, shortening visits despite less crowding. This accounts for the ticketing benefits by allowing improved gallery experience, while exhibit requirements explain shorter stays. Thus, it resolves the paradox by showing time reduction from scheduling constraints. In contrast, choice A addresses entry preferences but fails to explain shorter times with better experiences. Similarly, choice D notes viewing habits but does not reconcile less crowding with reduced time.