OAR Reading Comprehension: Inferences Questions and Answers — Questions and Answers
Question 1: Read the following passage and answer the question: "Historically, celestial navigation was an indispensable skill for mariners, requiring a sextant, a chronometer, and complex mathematical tables. A navigator's accuracy depended on a clear view of the horizon and celestial bodies, making overcast skies or foul weather significant impediments. The process was time-consuming and required a high degree of training and practice to master. While still taught as a backup, its primary role in commercial and military fleets has been superseded by modern electronic systems." What can be inferred about modern electronic navigation systems compared to celestial navigation?
- They are less dependent on weather conditions. (Correct answer)
- They require more extensive training to operate.
- They are less accurate in open-ocean environments.
- They are only used by military fleets.
Correct answer: They are less dependent on weather conditions.
The passage explicitly states that celestial navigation was impeded by 'overcast skies or foul weather.' By stating that modern systems have superseded celestial navigation, it is logical to infer that these modern systems have overcome such limitations, making them less dependent on weather. The other options are contradicted or not supported by the text.
Question 2: Read the following passage and answer the question: "The principle of buoyancy, first described by Archimedes, states that the upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid that the body displaces. A ship, despite being constructed from tons of steel which is far denser than water, floats because its hull is shaped to displace a large volume of water. If the weight of the displaced water is greater than the total weight of the ship, the ship floats. If it is less, the ship sinks." Based on the passage, what can be inferred about a submarine's ability to submerge and surface?
- It must be made of a material less dense than water.
- It sinks because its shape is not like a traditional ship's hull.
- It must have a method to alter its own weight or the volume of water it displaces. (Correct answer)
- It relies solely on propellers to push it underwater.
Correct answer: It must have a method to alter its own weight or the volume of water it displaces.
The passage explains that floating is a balance between the ship's weight and the weight of the water it displaces. To submerge (sink) and surface (float) at will, a submarine must be able to control this balance. This implies it can change its own weight (by taking in or expelling water in ballast tanks) to become heavier or lighter than the water it displaces. The other options misinterpret the core principle described.
Question 3: Read the following passage and answer the question: "In the early 20th century, naval strategists developed 'dazzle camouflage' not to hide a ship, but to confuse the enemy. The complex patterns of intersecting geometric shapes in contrasting colors were designed to make it difficult for an enemy to estimate a ship's type, speed, and heading. An enemy submarine commander using a periscope would have a hard time determining exactly where to aim a torpedo. This form of camouflage was a response to the advent of long-range naval gunnery and torpedo attacks where targeting accuracy was paramount." Which of the following can be inferred from the passage?
- Dazzle camouflage was most effective at close ranges.
- Before dazzle camouflage, all naval ships were painted gray.
- The primary goal of this camouflage was deception rather than concealment. (Correct answer)
- Dazzle camouflage was rendered obsolete by the invention of radar.
Correct answer: The primary goal of this camouflage was deception rather than concealment.
The passage explicitly states that dazzle camouflage was not meant 'to hide a ship, but to confuse the enemy' about its speed and direction. This directly supports the inference that its goal was deception (misleading the enemy's judgment) rather than concealment (making the ship invisible). The other statements are either not supported or contradicted by the text.
Question 4: Read the following passage and answer the question: "The chain of command on a naval vessel is a rigid hierarchical structure designed for operational effectiveness. Orders flow from the top down, from the commanding officer to department heads, then to division officers, and so on. This structure ensures that commands are executed swiftly and without ambiguity, which is critical during high-stakes situations. While formal communication follows this strict path, informal collaboration between departments at similar levels is often necessary for routine problem-solving." What is the most logical conclusion that can be drawn from this passage?
- Crew members are discouraged from ever speaking to anyone outside their direct chain of command.
- The system is too inflexible to handle day-to-day operational challenges.
- The hierarchy is intended to enhance clarity and efficiency in critical moments. (Correct answer)
- Promotion through the ranks is based solely on seniority.
Correct answer: The hierarchy is intended to enhance clarity and efficiency in critical moments.
The passage states the purpose of the rigid structure is to ensure commands are 'executed swiftly and without ambiguity, which is critical during high-stakes situations.' This directly supports the inference that the hierarchy's primary purpose is to improve clarity and efficiency, especially when it matters most. The mention of 'informal collaboration' contradicts option A and B, and the passage does not discuss promotion criteria.
Question 5: Read the following passage and answer the question: "A ship's 'watch' system divides the crew into sections, ensuring that all essential duties are continuously performed 24 hours a day, whether the vessel is at sea or in port. Each watch team is responsible for the ship's operation for a set period, after which they are relieved by the next team. This rotation prevents fatigue and ensures that personnel manning critical stations, such as the bridge or engine room, remain alert and responsive. The system has been refined over centuries to maximize both operational readiness and crew endurance." Based on the passage, which of the following is most likely true about a ship's operational status?
- The entire crew works at the same time and rests at the same time.
- Key operational areas of the ship are never left unattended. (Correct answer)
- The watch system is only used during emergency situations.
- Crew members are assigned to a single, permanent duty station.
Correct answer: Key operational areas of the ship are never left unattended.
The passage states that the watch system ensures duties are 'continuously performed 24 hours a day' and that teams relieve each other to man 'critical stations.' This leads to the logical inference that key areas are never left unattended. The text directly contradicts the other options by describing a rotational system where different sections of the crew work at different times.
Question 6: Read the following passage and answer the question: "The introduction of the gas turbine engine to naval vessels in the mid-20th century marked a significant leap in propulsion technology. Compared to the steam turbines they often replaced, gas turbines offered a much higher power-to-weight ratio, allowing ships to accelerate faster and reach higher top speeds. They could also be started and brought to full power in a matter of minutes, rather than the hours required for a steam plant. However, their fuel consumption at lower speeds was notably less efficient than their steam-powered predecessors." What can be inferred about a warship commander's decision to use a gas turbine engine?
- Gas turbines are the superior choice for long, slow patrols.
- The decision involves a trade-off between rapid response capability and fuel economy. (Correct answer)
- Steam turbines were completely removed from all naval ships after this technology was introduced.
- Gas turbine engines are significantly heavier than steam turbines.
Correct answer: The decision involves a trade-off between rapid response capability and fuel economy.
The passage highlights the pros and cons of gas turbines: they are fast to start and provide high power (good for rapid response), but are less fuel-efficient at low speeds (a drawback for fuel economy). This implies that choosing to use this engine involves weighing the need for speed and readiness against the need for fuel efficiency, which is a trade-off. The passage directly contradicts options A and D, and does not support the absolute statement in C.
OAR Reading Comprehension: Inferences Questions and Answers
Read the following passage and answer the question:
"Historically, celestial navigation was an indispensable skill for mariners, requiring a sextant, a chronometer, and complex mathematical tables.
A navigator's accuracy depended on a clear view of the horizon and celestial bodies, making overcast skies or foul weather significant impediments.
The process was time-consuming and required a high degree of training and practice to master.
While still taught as a backup, its primary role in commercial and military fleets has been superseded by modern electronic systems."
What can be inferred about modern electronic navigation systems compared to celestial navigation?
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Sources & references
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- med.navy.mil — Exam format, retake policy, score validity, test delivery, eligibility, score release, time limit · verified Oct 2026