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Question 1
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
21% (03:04) correct
79%
(03:15) wrong
based on 2771
sessions
History
Date
Time
Result
Not Attempted Yet
Question 2
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
73% (00:50) correct 27%
(00:56) wrong
based on 2800
sessions
History
Date
Time
Result
Not Attempted Yet
Question 3
C
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% (00:36) correct 14%
(00:49) wrong
based on 2714
sessions
History
Date
Time
Result
Not Attempted Yet
Question 4
A
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% (00:32) correct 14%
(00:39) wrong
based on 2728
sessions
History
Date
Time
Result
Not Attempted Yet
Question 5
C
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:
83% (01:13) correct 17%
(01:27) wrong
based on 1981
sessions
History
Date
Time
Result
Not Attempted Yet
In 1975 Chinese survey teams remeasured Mount Everest, the highest of the Himalayan mountains. Like the British in 1852, they used the age-old technique of “carrying in” sea level: surveyors marched inland from the coast for thousands of miles, stopping at increments of as little as a few feet to measure their elevation, and marking each increment with two poles. To measure the difference in elevation between poles, surveyors used an optical level—a telescope on a level base—placed halfway between the poles. They sighted each pole, reading off measurements that were then used to calculate the change in elevation over each increment. In sight of the peaks the used theodolites telescopes for measuring vertical and horizontal angles—to determine the elevation of the summit.
The Chinese, however, made efforts to correct for the errors that had plagued the British. One source of error is refraction, the bending of light beams as they pass through air layers of different temperature and pressure. Because light traveling. down from a summit passes through many such layers, a surveyor could sight a mirage rather than the peak itself. To reduce refraction errors, the Chinese team carried in sea level to within five to twelve miles of Everest’s summit, decreasing the amount of air that light passed through on its way to their theodolites. The Chinese also launched weather balloons near their theodolites to measure atmospheric temperature and pressure changes to better estimate refraction errors. Another hurdle is the peak’s shape. When surveyors sight the summit. there is a risk they might not all measure the same point. In 1975 the Chinese installed the first survey beacon on Everest, a red reflector visible through a theodolite for ten miles, as a reference point. One more source of error is the unevenness of sea level. The British assumed that carrying in sea level would extend an imaginary line from the shore along Earth’s curve to a point beneath the Himalaya. In reality, sea level varies according to the irregular interior of the planet. The Chinese used a gravity meter to correct for local deviations in sea level.
The Chinese, however, made efforts to correct for the errors that had plagued the British. One source of error is refraction, the bending of light beams as they pass through air layers of different temperature and pressure. Because light traveling. down from a summit passes through many such layers, a surveyor could sight a mirage rather than the peak itself. To reduce refraction errors, the Chinese team carried in sea level to within five to twelve miles of Everest’s summit, decreasing the amount of air that light passed through on its way to their theodolites. The Chinese also launched weather balloons near their theodolites to measure atmospheric temperature and pressure changes to better estimate refraction errors. Another hurdle is the peak’s shape. When surveyors sight the summit. there is a risk they might not all measure the same point. In 1975 the Chinese installed the first survey beacon on Everest, a red reflector visible through a theodolite for ten miles, as a reference point. One more source of error is the unevenness of sea level. The British assumed that carrying in sea level would extend an imaginary line from the shore along Earth’s curve to a point beneath the Himalaya. In reality, sea level varies according to the irregular interior of the planet. The Chinese used a gravity meter to correct for local deviations in sea level.
Question 32.
1. It can be inferred from the passage that refraction would be most likely to cause errors in measurements of a mountain’s elevation under which of the following conditions?
A. When there are local variations in sea level
B. When light passes through humid air
C. When theodolites are used relatively far from the mountain peak.
D. When weather balloons indicate low air temperature and pressure.
E. When sea level has been carried in to Within five to twelve miles of the summit.
1. It can be inferred from the passage that refraction would be most likely to cause errors in measurements of a mountain’s elevation under which of the following conditions?
A. When there are local variations in sea level
B. When light passes through humid air
C. When theodolites are used relatively far from the mountain peak.
D. When weather balloons indicate low air temperature and pressure.
E. When sea level has been carried in to Within five to twelve miles of the summit.
2. Which of the following best describes the purpose of the sentence in lines 23-25 (“The Chinese , however,...the British”)?
A. Introduce a definition
B. Signal a transition in focus
C. Summarize the preceding paragraph
D. Draw a contrast between two different theories.
E. Present information that contradicts the Preceding paragraph.
A. Introduce a definition
B. Signal a transition in focus
C. Summarize the preceding paragraph
D. Draw a contrast between two different theories.
E. Present information that contradicts the Preceding paragraph.
3. Which of the following is NOT mentioned as a possible source of error in surveying mountain elevation?
A. Mirages
B. Refraction
C. Inaccurate instruments
D. Variations in sea level
E. Uncertainty about the exact point to be Measured
A. Mirages
B. Refraction
C. Inaccurate instruments
D. Variations in sea level
E. Uncertainty about the exact point to be Measured
Question 35
4. The primary purpose of the passage is to
A. provide details about improvements to a process
B. challenge the assumptions underlying a new method
C. criticize the way in which a failed project was carried out
D. call for new methods to solve an existing problem
E. explain the theory behind a new technique
4. The primary purpose of the passage is to
A. provide details about improvements to a process
B. challenge the assumptions underlying a new method
C. criticize the way in which a failed project was carried out
D. call for new methods to solve an existing problem
E. explain the theory behind a new technique
5. The passage suggests which of the following about the technique used by the Chinese in their measurement of Mount Everest?
A. The Chinese employed the same assumptions about sea level as the British but used more accurate methods.
B. The Chinese used a different instrument for measuring the difference in elevation between increments than the British had.
C. The Chinese used the same basic technique as the British, supplementing it with modern refinements to knowledge and methods.
D. Since the accuracy of the technique of carrying in sea level had been challenged, the Chinese were obliged to develop a new technique to replace it.
E. Since few advances had been made in the field of mountain surveying, the Chinese used no equipment in addition to what the British had used.
A. The Chinese employed the same assumptions about sea level as the British but used more accurate methods.
B. The Chinese used a different instrument for measuring the difference in elevation between increments than the British had.
C. The Chinese used the same basic technique as the British, supplementing it with modern refinements to knowledge and methods.
D. Since the accuracy of the technique of carrying in sea level had been challenged, the Chinese were obliged to develop a new technique to replace it.
E. Since few advances had been made in the field of mountain surveying, the Chinese used no equipment in addition to what the British had used.
04 Aug 2011, 02:54
Kudos
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I also got CBCA.
For the first question, Since its an inference question, the passage must contain proof sentences for the inference.
To reduce refraction errors, the Chinese team carried in sea level to
within five to twelve miles of Everest’s summit, decreasing the amount of air
that light passed through on its way to their theodolites
The above effectively means that the refraction error is closely related to distance of theodolite from the peak.==> C
D cannot be the answer, definition of refraction mentions bending of light due to difference in pressure and temperature and not absolute low pressure and low temperature.
Crick
For the first question, Since its an inference question, the passage must contain proof sentences for the inference.
To reduce refraction errors, the Chinese team carried in sea level to
within five to twelve miles of Everest’s summit, decreasing the amount of air
that light passed through on its way to their theodolites
The above effectively means that the refraction error is closely related to distance of theodolite from the peak.==> C
D cannot be the answer, definition of refraction mentions bending of light due to difference in pressure and temperature and not absolute low pressure and low temperature.
Crick
19 Apr 2019, 00:42
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ballest127
This one doesn't seem to actually come from an official source, so I wouldn't worry about it too much. It was originally tagged as coming from the GMAC Paper Tests, but I just searched all of the publicly available exams, and it isn't in there. I changed the source to "other" -- if someone does find the source of this passage, please take a screenshot and post it!
Until then, please don't waste too much of your precious study time worrying about it.
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