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03 Sep 2024, 15:52
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Question 1
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
86% (01:50) correct
14%
(02:08) wrong
based on 74
sessions
History
Date
Time
Result
Not Attempted Yet
Question 2
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
64% (01:15) correct 36%
(01:37) wrong
based on 76
sessions
History
Date
Time
Result
Not Attempted Yet
Question 3
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
38% (00:50) correct 62%
(01:21) wrong
based on 77
sessions
History
Date
Time
Result
Not Attempted Yet
Radar is a system that uses radio waves to determine the distance, direction, and speed of objects. It comprises a transmitter that produces electromagnetic waves, a transmitting antenna, a receiving antenna (often the same for both functions), and a receiver and processor to analyze the object's properties.
The development of radar began in 1895 when Alexander Popov, a physics instructor in Russia, created a device to detect distant lightning using a coherer tube. In 1897, while testing communication between two ships, Popov noticed interference from a third ship and suggested it could be used for object detection, though he did not pursue this idea further.
In 1922, U.S. Navy researchers A. Hoyt Taylor and Leo C. Young placed a transmitter and receiver on opposite sides of the Potomac River and observed that passing ships caused the signal to fade. Taylor reported that this could help detect ships in low visibility, but the Navy did not pursue the idea at that time. Eight years later, Lawrence A. Hyland at the Naval Research Laboratory (NRL) noticed similar signal fading caused by passing aircraft, leading to a patent application.
These early observations laid the foundation for the development of radar, which would later become a critical technology for detecting objects under various conditions, especially in military applications.
The development of radar began in 1895 when Alexander Popov, a physics instructor in Russia, created a device to detect distant lightning using a coherer tube. In 1897, while testing communication between two ships, Popov noticed interference from a third ship and suggested it could be used for object detection, though he did not pursue this idea further.
In 1922, U.S. Navy researchers A. Hoyt Taylor and Leo C. Young placed a transmitter and receiver on opposite sides of the Potomac River and observed that passing ships caused the signal to fade. Taylor reported that this could help detect ships in low visibility, but the Navy did not pursue the idea at that time. Eight years later, Lawrence A. Hyland at the Naval Research Laboratory (NRL) noticed similar signal fading caused by passing aircraft, leading to a patent application.
These early observations laid the foundation for the development of radar, which would later become a critical technology for detecting objects under various conditions, especially in military applications.
Q.1 According to the passage, what observation did Alexander Popov make in 1897 while testing communication between two ships?
A. He discovered that radio waves could be used to detect lightning strikes.
B. He noticed that the presence of another vessel disrupted the radio signals between the two ships.
C. He found that placing a transmitter and receiver on opposite sides of a river could detect passing ships.
D. He observed signal fading caused by passing aircraft.
E. He determined that radar could detect ships in low visibility conditions.
A. He discovered that radio waves could be used to detect lightning strikes.
B. He noticed that the presence of another vessel disrupted the radio signals between the two ships.
C. He found that placing a transmitter and receiver on opposite sides of a river could detect passing ships.
D. He observed signal fading caused by passing aircraft.
E. He determined that radar could detect ships in low visibility conditions.
Q2. Based on the passage, which of the following can most reasonably be inferred about the early development of radar technology?
A. The development of radar technology was a direct result of Popov's continued research after his 1897 discovery.
B. U.S. Navy researchers A. Hoyt Taylor and Leo C. Young were the first to recognize the potential of radar for detecting objects.
C. The phenomenon of signal fading was a key observation that contributed to the eventual development of radar.
D. Radar technology was immediately recognized for its potential in military applications after Popov's initial discovery.
E. The concept of using radio waves to detect objects was largely ignored by researchers until the 1930s.
A. The development of radar technology was a direct result of Popov's continued research after his 1897 discovery.
B. U.S. Navy researchers A. Hoyt Taylor and Leo C. Young were the first to recognize the potential of radar for detecting objects.
C. The phenomenon of signal fading was a key observation that contributed to the eventual development of radar.
D. Radar technology was immediately recognized for its potential in military applications after Popov's initial discovery.
E. The concept of using radio waves to detect objects was largely ignored by researchers until the 1930s.
Q3. Which of the following best describes the organization of the passage?
A. The passage introduces a scientific concept, discusses its early theoretical development, and then highlights its practical applications over time.
B. The passage presents a historical overview of a technology, focusing on key developments and the gradual recognition of its potential.
C. The passage defines a technology, traces its development through a chronological sequence of discoveries, and concludes with its current applications.
D. The passage discusses a scientific principle, describes the challenges in its early implementation, and outlines the steps taken to overcome these challenges.
E. The passage introduces a concept, contrasts the contributions of different researchers, and concludes with a discussion of the technology's modern-day relevance.
A. The passage introduces a scientific concept, discusses its early theoretical development, and then highlights its practical applications over time.
B. The passage presents a historical overview of a technology, focusing on key developments and the gradual recognition of its potential.
C. The passage defines a technology, traces its development through a chronological sequence of discoveries, and concludes with its current applications.
D. The passage discusses a scientific principle, describes the challenges in its early implementation, and outlines the steps taken to overcome these challenges.
E. The passage introduces a concept, contrasts the contributions of different researchers, and concludes with a discussion of the technology's modern-day relevance.
04 Sep 2024, 11:29
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Here is the official solution to this question:
Q.1 According to the passage, what observation did Alexander Popov make in 1897 while testing communication between two ships?
Correct Answer:
B. He noticed that a third ship caused interference in the communication between the two ships.
This is the correct answer because the passage explicitly states that in 1897, Popov noticed interference caused by the passage of a third ship while testing communication between two ships. This detail is critical to understanding Popov's early contribution to radar technology.
Incorrect Answers:
A. He discovered that radio waves could be used to detect lightning strikes.
• This is incorrect because, although Popov did develop a device to detect lightning using a coherer tube, this discovery was made in 1895, not during the 1897 ship communication test.
C. He found that placing a transmitter and receiver on opposite sides of a river could detect passing ships.
• This is incorrect because this observation was made by U.S. Navy researchers A. Hoyt Taylor and Leo C. Young in 1922, not by Popov in 1897.
D. He observed signal fading caused by passing aircraft.
• This is incorrect because this observation was made by Lawrence A. Hyland in 1930, not by Popov in 1897.
E. He determined that radar could detect ships in low visibility conditions.
• This is incorrect because while the passage mentions that Taylor suggested this use in 1922, there is no indication that Popov made such a determination in 1897.
Q2. Based on the passage, which of the following can most reasonably be inferred about the early development of radar technology?
Correct Answer:
C. The phenomenon of signal fading was a key observation that contributed to the eventual development of radar.
This is the correct answer because the passage discusses how signal fading was observed both by Popov and later by U.S. Navy researchers and Lawrence A. Hyland. These observations were crucial in recognizing the potential of using radio waves for object detection, leading to the development of radar technology.
Incorrect Answers:
A. The development of radar technology was a direct result of Popov's continued research after his 1897 discovery.
• This is incorrect because the passage states that Popov did not pursue his idea further after noticing the interference in 1897.
B. U.S. Navy researchers A. Hoyt Taylor and Leo C. Young were the first to recognize the potential of radar for detecting objects.
• This is incorrect because Popov had already suggested the potential for object detection in 1897, although he did not continue with the research.
D. Radar technology was immediately recognized for its potential in military applications after Popov's initial discovery.
• This is incorrect because the passage indicates that neither Popov's observation nor Taylor's report was immediately followed up with further development.
E. The concept of using radio waves to detect objects was largely ignored by researchers until the 1930s.
• This is incorrect because the passage shows that significant observations were made by researchers in the 1920s, even though they were not immediately developed into radar technology.
Q.3 Which of the following best describes the organization of the passage?
Correct Answer:
B. The passage presents a historical overview of a technology, focusing on key developments and the gradual recognition of its potential.
This is the correct answer because the passage provides a historical account of radar technology, highlighting significant discoveries by Popov, Taylor, Young, and Hyland, and how these observations contributed to the eventual development of radar. The focus is on the progression of key developments and how the potential of radar was recognized over time.
Incorrect Answers:
A. The passage introduces a scientific concept, discusses its early theoretical development, and then highlights its practical applications over time.
• This is incorrect because the passage does not discuss the practical applications of radar technology over time; it focuses on the historical discoveries that led to its development.
C. The passage defines a technology, traces its development through a chronological sequence of discoveries, and concludes with its current applications.
• This is close but incorrect because, while the passage does trace the development of radar, it does not conclude with a discussion of its current applications- only it's potential for military applications is mentioned.
D. The passage discusses a scientific principle, describes the challenges in its early implementation, and outlines the steps taken to overcome these challenges.
• This is incorrect because the passage does not focus on challenges in implementing radar or on steps taken to overcome these challenges; it focuses on key historical observations.
E. The passage introduces a concept, contrasts the contributions of different researchers, and concludes with a discussion of the technology's modern-day relevance.
• This is incorrect because the passage does not contrast the contributions of different researchers or discuss modern-day relevance; it simply presents the historical development of radar technology.
Q.1 According to the passage, what observation did Alexander Popov make in 1897 while testing communication between two ships?
Correct Answer:
B. He noticed that a third ship caused interference in the communication between the two ships.
This is the correct answer because the passage explicitly states that in 1897, Popov noticed interference caused by the passage of a third ship while testing communication between two ships. This detail is critical to understanding Popov's early contribution to radar technology.
Incorrect Answers:
A. He discovered that radio waves could be used to detect lightning strikes.
• This is incorrect because, although Popov did develop a device to detect lightning using a coherer tube, this discovery was made in 1895, not during the 1897 ship communication test.
C. He found that placing a transmitter and receiver on opposite sides of a river could detect passing ships.
• This is incorrect because this observation was made by U.S. Navy researchers A. Hoyt Taylor and Leo C. Young in 1922, not by Popov in 1897.
D. He observed signal fading caused by passing aircraft.
• This is incorrect because this observation was made by Lawrence A. Hyland in 1930, not by Popov in 1897.
E. He determined that radar could detect ships in low visibility conditions.
• This is incorrect because while the passage mentions that Taylor suggested this use in 1922, there is no indication that Popov made such a determination in 1897.
Q2. Based on the passage, which of the following can most reasonably be inferred about the early development of radar technology?
Correct Answer:
C. The phenomenon of signal fading was a key observation that contributed to the eventual development of radar.
This is the correct answer because the passage discusses how signal fading was observed both by Popov and later by U.S. Navy researchers and Lawrence A. Hyland. These observations were crucial in recognizing the potential of using radio waves for object detection, leading to the development of radar technology.
Incorrect Answers:
A. The development of radar technology was a direct result of Popov's continued research after his 1897 discovery.
• This is incorrect because the passage states that Popov did not pursue his idea further after noticing the interference in 1897.
B. U.S. Navy researchers A. Hoyt Taylor and Leo C. Young were the first to recognize the potential of radar for detecting objects.
• This is incorrect because Popov had already suggested the potential for object detection in 1897, although he did not continue with the research.
D. Radar technology was immediately recognized for its potential in military applications after Popov's initial discovery.
• This is incorrect because the passage indicates that neither Popov's observation nor Taylor's report was immediately followed up with further development.
E. The concept of using radio waves to detect objects was largely ignored by researchers until the 1930s.
• This is incorrect because the passage shows that significant observations were made by researchers in the 1920s, even though they were not immediately developed into radar technology.
Q.3 Which of the following best describes the organization of the passage?
Correct Answer:
B. The passage presents a historical overview of a technology, focusing on key developments and the gradual recognition of its potential.
This is the correct answer because the passage provides a historical account of radar technology, highlighting significant discoveries by Popov, Taylor, Young, and Hyland, and how these observations contributed to the eventual development of radar. The focus is on the progression of key developments and how the potential of radar was recognized over time.
Incorrect Answers:
A. The passage introduces a scientific concept, discusses its early theoretical development, and then highlights its practical applications over time.
• This is incorrect because the passage does not discuss the practical applications of radar technology over time; it focuses on the historical discoveries that led to its development.
C. The passage defines a technology, traces its development through a chronological sequence of discoveries, and concludes with its current applications.
• This is close but incorrect because, while the passage does trace the development of radar, it does not conclude with a discussion of its current applications- only it's potential for military applications is mentioned.
D. The passage discusses a scientific principle, describes the challenges in its early implementation, and outlines the steps taken to overcome these challenges.
• This is incorrect because the passage does not focus on challenges in implementing radar or on steps taken to overcome these challenges; it focuses on key historical observations.
E. The passage introduces a concept, contrasts the contributions of different researchers, and concludes with a discussion of the technology's modern-day relevance.
• This is incorrect because the passage does not contrast the contributions of different researchers or discuss modern-day relevance; it simply presents the historical development of radar technology.
