OAR Reading Comprehension: Main Idea Questions and Answers — Questions and Answers
Question 1: Read the following passage and answer the question. Active sonar systems operate by transmitting a sound pulse, often called a 'ping,' and then listening for the echo. This echo allows the system to determine the range and bearing of a submerged object. Passive sonar, in contrast, involves simply listening for sounds made by the target itself, such as engine noise or propeller cavitation. While passive sonar offers the advantage of stealth, as it does not emit any energy that could reveal the listener's position, active sonar generally provides more precise data on a target's location and movement. The choice between active and passive sonar often depends on the tactical situation, balancing the need for precise information against the risk of detection.
- Active sonar is superior to passive sonar because it provides more precise data.
- The primary advantage of passive sonar is the stealth it provides during operations.
- Sonar systems can be either active or passive, each with distinct operational principles, advantages, and tactical applications. (Correct answer)
- Modern naval warfare relies exclusively on active sonar for target detection.
Correct answer: Sonar systems can be either active or passive, each with distinct operational principles, advantages, and tactical applications.
The passage introduces and compares both active and passive sonar, discussing how they work, their respective pros and cons, and their use in tactical situations. The correct answer is the only one that summarizes this entire comparison. The other options focus on only one specific detail or are factually incorrect based on the text.
Question 2: Read the following passage and answer the question. Naval logistics is the lifeblood of any sea-based military force, encompassing the acquisition, storage, transport, and delivery of all necessary supplies. This includes everything from fuel and ammunition to spare parts and food. A navy's ability to project power across the globe is not solely dependent on the strength of its warships but is fundamentally limited by its logistical tail—the network of supply ships, bases, and personnel that sustain the fleet. Without a robust and efficient logistics system, even the most advanced carrier strike group would be rendered ineffective in a matter of weeks, unable to continue its mission.
- The operational capability and power projection of a navy are critically dependent on a strong logistics system. (Correct answer)
- Naval logistics primarily deals with supplying fuel and ammunition to warships.
- The strength of a navy's warships is more important than its logistical support.
- All military branches require extensive logistical support to function.
Correct answer: The operational capability and power projection of a navy are critically dependent on a strong logistics system.
The passage repeatedly emphasizes that a navy's effectiveness and ability to project power are fundamentally tied to its logistical support system. The correct answer captures this core relationship. The other options are either supporting details, contradictions of the main point, or too broad for the passage's specific focus on *naval* logistics.
Question 3: Read the following passage and answer the question. On any naval vessel, the responsibility for damage control is not limited to a specialized team but is ingrained in the training of every crew member. The principle 'every sailor is a firefighter' underscores this philosophy. From the moment of a casualty—be it a fire, flood, or structural damage—a rapid and coordinated response is critical to saving the ship. Training drills constantly reinforce procedures for containing flooding by securing watertight doors and combating different classes of fires with appropriate extinguishers. This all-hands-on-deck approach ensures that the vessel has the resilience to withstand significant damage and continue its mission.
- The specific procedures for containing flooding are the most important part of damage control.
- The primary purpose of this passage is to explain the fundamental principle that damage control on a naval vessel is a collective responsibility of the entire crew. (Correct answer)
- Specialized damage control teams are the most critical element in saving a ship.
- Firefighting is a more important skill than flood containment for sailors.
Correct answer: The primary purpose of this passage is to explain the fundamental principle that damage control on a naval vessel is a collective responsibility of the entire crew.
The main point, introduced in the first sentence and reinforced throughout, is that damage control is an 'all-hands' responsibility, not just the job of a few specialists. The correct answer directly states this core philosophy. The other options highlight specific examples used to support the main idea or contradict the passage's emphasis on collective responsibility.
Question 4: Read the following passage and answer the question. Unmanned Underwater Vehicles (UUVs) are transforming maritime operations by providing capabilities for missions that are too 'dull, dirty, or dangerous' for manned submarines. These autonomous or remotely operated vehicles can be deployed for extended periods to conduct persistent surveillance, map the ocean floor, or search for underwater mines. Unlike traditional submarines, UUVs do not need to account for crew life support, allowing for much longer mission durations and operations in hazardous environments. While they do not replace the full range of capabilities of a nuclear submarine, UUVs serve as powerful force multipliers, extending the reach and situational awareness of the fleet.
- The Future of All Submarine Warfare
- The Inevitable Replacement of Manned Submarines
- Detailed Methods for Mine Countermeasures Using UUVs
- UUVs: A Force Multiplier for Modern Navies (Correct answer)
Correct answer: UUVs: A Force Multiplier for Modern Navies
The passage describes how UUVs enhance, rather than replace, existing naval capabilities, acting as 'force multipliers.' This title perfectly encapsulates the central idea. 'The Future of All Submarine Warfare' is too broad. 'The Inevitable Replacement of Manned Submarines' is inaccurate, as the text explicitly states they do not replace submarines. 'Detailed Methods for Mine Countermeasures' is too specific, as it's just one example mission.
Question 5: Read the following passage and answer the question. Most modern naval surface combatants rely on gas turbine engines for propulsion, a technology adapted from aviation. These engines offer a very high power-to-weight ratio, allowing large ships to accelerate quickly and achieve high speeds. They can also be started and brought to full power rapidly, a significant advantage over older steam plants. However, gas turbines are most efficient when operating at or near their maximum power output; at lower speeds, their fuel consumption is considerably higher than that of diesel engines. This operational characteristic often leads to the use of combined propulsion systems, which might use diesel engines for cruising and gas turbines for high-speed sprints.
- The primary benefit of gas turbine engines is their rapid start-up time.
- Gas turbine engines are the most fuel-efficient propulsion option for all naval operations.
- Naval propulsion technology has evolved significantly over the last century.
- Gas turbine engines provide significant power advantages for naval ships but have efficiency drawbacks that often necessitate combined propulsion systems. (Correct answer)
Correct answer: Gas turbine engines provide significant power advantages for naval ships but have efficiency drawbacks that often necessitate combined propulsion systems.
The passage presents a balanced view, discussing both the major advantages (power, speed, start-up time) and the primary disadvantage (poor fuel efficiency at low speeds) of gas turbine engines. The correct answer captures this complete picture. The other options are either a single supporting detail, directly contradicted by the text, or too general.
Question 6: Read the following passage and answer the question. Rules of Engagement (ROE) are directives issued by a competent military authority that delineate the circumstances and limitations under which forces will initiate and/or continue combat engagement with other forces encountered. ROE are not a substitute for, but are in addition to, the law of armed conflict. Their purpose is to ensure that military actions are consistent with national policy objectives, both political and military. For a commander, this means having a clear understanding of when it is permissible to use force. These rules are carefully crafted to prevent unintended escalation while ensuring the right to self-defense.
- Rules of Engagement are the same as the international law of armed conflict.
- The primary purpose of ROE is to ensure a commander's right to self-defense.
- Rules of Engagement are critical directives that control the use of military force to align with national policy and prevent unintended conflict. (Correct answer)
- Naval commanders use ROE primarily to decide when to fire warning shots.
Correct answer: Rules of Engagement are critical directives that control the use of military force to align with national policy and prevent unintended conflict.
The passage defines ROE and explains their primary function: to control military action in accordance with national policy and manage escalation. The correct answer is a concise summary of this definition and purpose. Option A is explicitly contradicted by the text. Option B (self-defense) and Option D (warning shots) are mentioned as components or examples but are not the main idea.
OAR Reading Comprehension: Main Idea Questions and Answers
Read the following passage and answer the question.
Active sonar systems operate by transmitting a sound pulse, often called a 'ping,' and then listening for the echo.
This echo allows the system to determine the range and bearing of a submerged object.
Passive sonar, in contrast, involves simply listening for sounds made by the target itself, such as engine noise or propeller cavitation.
While passive sonar offers the advantage of stealth, as it does not emit any energy that could reveal the listener's position, active sonar generally provides more precise data on a target's location and movement.
The choice between active and passive sonar often depends on the tactical situation, balancing the need for precise information against the risk of detection.
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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