All practice questions

A county maintenance crew is installing reflective markers along a newly paved road that is exactly $1$ mile long. They completed the work over three days. On the first day, they marked $\frac{1}{4}$ of a mile. On the second day, they marked $\frac{1}{6}$ of a mile. On the third day, they marked a section measuring $300$ yards, $1$ foot, and $8$ inches. What is the length of the road that still needs markers, in feet and inches?

Passage:
Despite the precision and global reach of satellite-based Global Positioning System (GPS) technology, modern naval forces have reinstated formal training in manual celestial navigation using traditional sextants. In high-intensity electronic warfare environments, satellite signals are vulnerable to jamming, spoofing, and cyber interference, which can render digital navigation suites unreliable or entirely inoperative. By maintaining proficiency in measuring the angle between celestial bodies and the horizon, bridge crews retain an unjammable, self-contained method to determine geographic coordinates anywhere at sea. Reintroducing these historical techniques ensures vessels can execute their missions safely even when digital systems fail.

What is the author's primary purpose in this passage?

Based on the explicit synonym context clues provided in each sentence, match each underlined vocabulary word with its accurate synonym definition.

Before the 1950s, cargo ships spent weeks in port while dockworkers individually loaded crates, barrels, and sacks of various shapes into cargo holds. Goods frequently suffered damage from repeated handling, and theft was widespread along crowded waterfronts. When uniform rectangular steel containers were introduced across docks, railways, and flatbed trucks, loading times dropped from weeks to hours, transit damage plummeted, and port congestion disappeared.

Which of the following best expresses the unstated main idea of the passage?

Passage:
Portable water purification tablets are essential gear for field personnel operating in remote environments where treated municipal water is unavailable. These tablets primarily utilize chlorine dioxide or iodine to neutralize harmful waterborne pathogens, such as bacteria and protozoa, that cause severe gastrointestinal illness. While mechanical filtration removes visible debris and sediment, chemical disinfection ensures microbiological safety within thirty minutes. Carrying these lightweight tablets is critical to preventing waterborne disease and maintaining operational readiness during extended field deployments.

Statement: The author's primary purpose in this passage is to explain the importance of carrying water purification tablets during field operations.

Pre-flight inspection of an aircraft's pitot-static system is essential for flight safety. The pitot tube measures dynamic air pressure to determine airspeed, while static ports measure ambient atmospheric pressure to determine altitude and vertical speed. If these openings become blocked by ice, dirt, or insects, cockpit instruments will provide false readings, potentially leading to catastrophic navigational errors. Maintenance personnel and pilots must verify that all covers are removed and the orifices are unobstructed before every takeoff.

What is the author's primary purpose in this passage?

Steel-hulled naval vessels inevitably acquire a permanent magnetic signature during construction through mechanical stress in Earth's geomagnetic field, while also exhibiting an induced magnetic field that fluctuates with heading and latitude. Because magnetic influence sea mines detect localized distortions in the geomagnetic field caused by these combined signatures, warships utilize degaussing coils—networks of electrical cables running throughout the hull. By precisely adjusting direct current through these coils, the ship generates counter-magnetic fields that actively cancel both permanent and induced magnetic anomalies. While degaussing cannot render a vessel completely invisible to magnetic sensors, its systematic calibration drastically reduces the trigger radius of underwater munitions, significantly improving survivability in contested waters.

Which of the following best describes the author's primary purpose in this passage?

During the rapid deployment of early field telegraph networks across arid territories, communication units repeatedly experienced severe signal attenuation despite unbroken copper wiring and fully charged batteries. Infrequent desert downpours caused porous untreated timber posts to draw moisture and alkaline mineral salts upward from the ground. This capillary absorption transformed the structural uprights into unintended electrical conduits, draining current directly into the earth at hundreds of intermediate contact points. Maintenance crews initially attempted to resolve the failures by boosting transmission voltage, which accelerated line overheating and power depletion. Reliable message transmission was restored only after crews installed resin-coated brackets to isolate the wiring from the conductive wooden supports.

Which of the following best expresses the unstated main idea of the passage?

Fill in each blank with the same vocabulary word to satisfy the distinct meaning required by each sentence.

Read the passage below:

Modern nuclear-powered submarines rely on electrolytic oxygen generators to sustain crew life during extended submerged deployments. These systems split demineralized water into hydrogen and oxygen through electrolysis. While the vital oxygen is circulated throughout the hull to maintain atmospheric balance, the byproduct hydrogen gas presents a severe flammability risk. Consequently, automated catalytic burners recombine or overboard-discharge systems vent the hydrogen safely into the sea. Although carbon dioxide scrubbers and trace contaminant removers also operate in tandem, the controlled management of electrolytic oxygen production and hydrogen mitigation remains the foundational cornerstone of prolonged submerged operations.

Evaluate the following statement: The passage is best summarized as an explanation of how catalytic burners and carbon dioxide scrubbers maintain safety aboard submerged submarines.

The commanding officer refused to entertain any unverified claims during the strategic briefing. What is the meaning of the underlined word in this sentence?

Read the following passage:

Modern composite armor systems combine an ultra-hard ceramic strike face with a ductile backing material, such as ultra-high-molecular-weight polyethylene. When a high-velocity projectile strikes the ceramic exterior, the ceramic's extreme hardness blunts and fractures the penetrator, dispersing concentrated kinetic energy across a wider surface area. The remaining shattered fragments and kinetic shock are subsequently captured and absorbed by the flexible backing layers, preventing hull perforation and mitigating behind-armor blunt trauma. By leveraging the distinct physical properties of each layer, composite armor delivers superior ballistic protection while substantially reducing total system weight compared to monolithic steel plating.

Statement: The author's primary purpose in the passage is to explain how combining different material layers provides effective ballistic protection.

In marine engineering, bronze propellers attached to steel hulls create an electrochemical circuit that accelerates the corrosion of the hull when immersed in saltwater. To mitigate this galvanic degradation, shipwrights affix sacrificial zinc anodes directly adjacent to the propeller shaft. Because zinc possesses a lower electrochemical potential than both steel and bronze, the electrolytic reaction preferentially oxidizes the zinc blocks while leaving the surrounding structural steel intact. Over time, these zinc attachments dissolve entirely and must be replaced during scheduled drydock maintenance to ensure ongoing hull preservation.

According to the passage, how do zinc anodes safeguard the steel structure of a vessel?

Due to a faulty sensor, the drone displayed erratic flight patterns—unpredictable and irregular movements that forced the operator to abort the mission. In this sentence, what does the word erratic most nearly mean?

Thermoelectric coolers (TECs) utilize the Peltier effect to transfer heat across the junction of two dissimilar semiconductors when an electric current is applied. As direct current passes through the module, heat is absorbed on the cold ceramic face and dissipated at the opposite heat sink side. Because TECs contain no moving mechanical parts, circulating refrigerants, or compressors, they operate silently and reliably in compact electronic enclosures. Although their overall energy efficiency is lower than conventional vapor-compression systems, their solid-state design and precise temperature regulation make them indispensable for stabilizing sensitive infrared sensors and laser diodes.

What is the author's primary purpose in this passage?

Read the following passage carefully:

Modern high-performance aircraft rely on integrated environmental control systems (ECS) to maintain pilot consciousness and airframe integrity during supersonic flight. While auxiliary bleed air from jet turbines provides the necessary volume of cabin pressurization, rapid changes in ambient temperature present a far greater thermal management challenge. Advanced heat exchangers mitigate aerodynamic skin friction, which can heat fuselage surfaces beyond 300°F at Mach 2. By circulating specialized polyalphaolefin liquid coolant through internal avionics bays and cockpit heat sinks, modern ECS architectures successfully stabilize internal cockpit temperatures despite extreme external thermal loads. Without these active thermodynamic cycles, electronic sensor degradation and acute crew hyperthermia would prevent extended high-speed operations.

Which structural role best matches each excerpted statement from the passage?

Aircraft tires are inflated exclusively with dry nitrogen rather than compressed ambient air to ensure operational safety and stability under extreme conditions. Nitrogen is an inert gas that eliminates moisture, thereby preventing internal rim corrosion and reducing the risk of tire degradation. Furthermore, unlike ambient air containing water vapor, dry nitrogen undergoes predictable and minimal pressure changes during drastic temperature swings, such as shifting from sub-zero cruising altitudes to high-heat friction on landing runways. This thermal consistency prevents dangerous pressure spikes and structural failures during demanding braking maneuvers.

Which of the following statements expresses the main idea explicitly stated in the passage?

Read the following passage:

During the case-hardening of heavy-duty transmission gears, low-carbon steel blanks undergo gas carburizing inside a sealed, high-temperature furnace. Carbon monoxide gas dissociates at the steel surface at temperatures exceeding 900°C, allowing carbon atoms to diffuse into the outer crystalline lattice. This enrichment increases the carbon content of the gear's outer perimeter while preserving the ductile, low-carbon core. Consequently, after quenching, the gear develops a wear-resistant exterior shell capable of enduring extreme tooth-contact stresses without becoming brittle enough to fracture under sudden shock loads.

Statement: According to the passage, the gas carburizing process ensures that the interior section of the gear retains its flexibility to withstand sudden impact forces.

The supply specialist reported that the additional rations were superfluous for a one-day field exercise. What does the word superfluous most nearly mean?

Read the passage below:

Modern automotive disc brake pads are equipped with small metal tabs known as acoustic wear indicators. As the friction material wears down from repeated braking, these metal indicators gradually become exposed. When the pad thickness reaches a critical threshold of approximately two millimeters, the metal tab makes direct contact with the spinning brake rotor, producing a distinct high-pitched screeching noise. This audible warning alerts the driver that the brake pads require immediate replacement before the steel backing plate damages the rotor surface.

Based on the passage, the acoustic indicator emits a shrill sound to notify motorists when the friction lining has thinned to an unsafe depth.