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In 1975 Chinese survey teams remeasured Mount Everest, the highest of

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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
32.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?
D. When weather balloons indicate low air temperature and pressure.
" The Chinese also launched weather balloons near their theodolites to measure atmospheric temperature and pressure changes to better estimate refraction errors."
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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I know it's useless to disagree with Official answers and all that, but please allow me,

Q32.

The official answer is D, but it says "When weather balloons indicate low air temperature and pressure." so, same level of temp and pressure.

according to the text,

"One source of error is refraction, the bending of light beams as they pass through air layers of different temperature and pressure. " so the refraction is the result of passing through DIFFERENT T and P, Therefore D just can't be correct here. ~

Am I missing something?
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
iliavko wrote:
I know it's useless to disagree with Official answers and all that, but please allow me,

Q32.

The official answer is D, but it says "When weather balloons indicate low air temperature and pressure." so, same level of temp and pressure.

according to the text,

"One source of error is refraction, the bending of light beams as they pass through air layers of different temperature and pressure. " so the refraction is the result of passing through DIFFERENT T and P, Therefore D just can't be correct here. ~

Am I missing something?

Hi, I would like to add my 2 cents on your concern. As per my understanding, (D) is not wrong, or if any, not wrong for the reason you cited.

First of all, in the passage: "One source of error is refraction, the bending of light beams as they pass through air layers of different temperature and pressure. ---> It is mentioned that temperature and pressure of one layer is different from those of another layer.

In option D: "When weather balloons indicate low air temperature and pressure." --->In my initial reading, I thought this sentence meant that there is a difference in air temperature and pressure of different layers. In more details, temperate and pressure of one layer is lower than those of another layer. That's why there is no inconsistence between option (D) and information given in the passage.

Btw, I've got this passage in GMATPrep practice but did not face with question no.1. And then when I attempted this question for the first time on this forum, I chose D. I must admit that IMHO this is a difficult question, but what surprised me the most is that almost everyone commented above argued for another option. I did bookmark this post to read further comments from experts.

Hi expert GMATNinja, could you share some thoughts on Question no.1? Thank you so much!
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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Quite a controversial question. Though, my reasoning is more inclined towards answer choice C for the first problem. But, I still don't understand how come OA is D.

A -> not an issue
B -> type of air that would cause disturbance is not mentioned
D -> see B
E -> confuses info (see C)
C -> "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." so they needed to get close to get a good measurement.
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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Took around 8 mins 20 seconds , including 4 mins to read . Got the first question incorrect . In my opinion, OA D seems contentious .

Q32. 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?

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.

A. When there are local variations in sea level -- Incorrect
B. When light passes through humid air -- Irrelevant -- the cause of refraction is passage of light through air layers of different temperature and pressure
C. When theodolites are used relatively far from the mountain peak. -- greater distance itself won't cause refraction, but with increasing distance the probability of light passing through air layers of different temperature and pressure
D. When weather balloons indicate low air temperature and pressure. -- here we have to assume that a few layers of air through which the light passes will have air temperature and pressure that is not low -- maybe normal or high ?
E. When sea level has been carried in to Within five to twelve miles of the summit. -- This was a way to reduce refraction errors that was adopted by Chinese

AjiteshArun , mikemcgarry ,daagh ,egmat , GMATNinja , sayantanc2k , RonPurewal ,ChiranjeevSingh other experts -- can you please help with Q32 ?
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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Skywalker18 wrote:
Took around 8 mins 20 seconds , including 4 mins to read . Got the first question incorrect . In my opinion, OA D seems contentious .

Q32. 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?

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.

A. When there are local variations in sea level -- Incorrect
B. When light passes through humid air -- Irrelevant -- the cause of refraction is passage of light through air layers of different temperature and pressure
C. When theodolites are used relatively far from the mountain peak. -- greater distance itself won't cause refraction, but with increasing distance the probability of light passing through air layers of different temperature and pressure
D. When weather balloons indicate low air temperature and pressure. -- here we have to assume that a few layers of air through which the light passes will have air temperature and pressure that is not low -- maybe normal or high ?
E. When sea level has been carried in to Within five to twelve miles of the summit. -- This was a way to reduce refraction errors that was adopted by Chinese

AjiteshArun , mikemcgarry ,daagh ,egmat , GMATNinja , sayantanc2k , RonPurewal ,ChiranjeevSingh other experts -- can you please help with Q32 ?

Hi Skywalker18! I'll jump in for Mike here

In my opinion, this is not a very well written question, and not up to GMAT standards. As you and others have pointed out, both C and D have elements that could be considered correct. I think your analysis is correct here - for choice C, with increasing distance, there is a higher probability that light will have to pass through regions of different temperature and pressure, causing refraction. This is supported by the part of the passage that states "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."

For choice D, we can assume that if there is low temperature and pressure closer to the summit, there are likely different layers of temperature and pressure that the light has to travel through, which also will cause refraction errors.

So both answer choices have some merit here; again, I don't think this is a very well-written question. I wouldn't say that either C or D is substantially more supported by the passage.

-Carolyn
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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This is another question that belongs to the same passage.I have come across this question in Exam pack 1.please add it.

"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.

OA: C
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
i think OA for question 1 is wrong it should be C not D , nowhere in the passage it is mentioned that low air temperature and pressure causes errors .it is mentioned that light beams as they pass through air layers of DIFFERENT TEMPERATURES AND PRESSURE causes refraction.it can also be inferred from para 2 line 4 that C is the right answer
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
Hi expert,

I would like to ask for OE for Q1.

Thank you.
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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ballest127 wrote:
Hi expert,

I would like to ask for OE for Q1.

Thank you.

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!

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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
I think Question no 32 has some problems? the OA provided is wrong?
or I am not clear about the question.
Can someone explain it to me?

Originally posted by aankit on 21 Apr 2019, 00:58.
Last edited by aankit on 21 Apr 2019, 04:19, edited 1 time in total.
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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GMATNinja, GMATNinjaTwo

Hi - Can you please explain what is wrong with Option E in the below Q? Why is option B preferred? Thanks.

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.
Question 2
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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GMATNinja wrote:
ballest127 wrote:
Hi expert,

I would like to ask for OE for Q1.

Thank you.

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!

This question is from GMAT Practice Exam pack. I can't upload a screenshot because I don't have 5 posts.
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
Took 8 minutes and 18 seconds to solve the passage got all correct except Q1
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In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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GMATNinja

Hi! Could you please be so kind to explain why the answer to the following question is B and not E?;

Which of the following best describes the purpose of the sentence in lines 23-25 (“The Chinese , however,…the British”)?
A. Introduce a definition -> no definition
B. Signal a transition in focus -> could be, but does it really signal?
C. Summarize the preceding paragraph -> no summary but more contradiction and moving on
D. Draw a contrast between two different theories. -> no theories
E. Present information that contradicts the Preceding paragraph. -> 'however', and it mentions that The Chinese made different efforts than the Britains did mentioned in the previous paragraph.

Was doubting between B and E, but B seemed pretty vague what a 'signal a transition in focus' would be.
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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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GMATNinja wrote:
ballest127 wrote:
Hi expert,

I would like to ask for OE for Q1.

Thank you.

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!

Hi GMATNinja
Attached screenshot referenced. The source of the passage is the official practice exam(s). Though it appears the contentious question (Q1 above) has been removed.
Attachments

Screenshot 2021-03-15 134651.jpg [ 232.75 KiB | Viewed 19162 times ]

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Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
achanak wrote:
GMATNinja wrote:
ballest127 wrote:
Hi expert,

I would like to ask for OE for Q1.

Thank you.

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!

Hi GMATNinja
Attached screenshot referenced. The source of the passage is the official practice exam(s). Though it appears the contentious question (Q1 above) has been removed.

Thanks for tracking that down! We'll continue to ignore the first question until it's verified, but will assume that the rest are legit .
Re: In 1975 Chinese survey teams remeasured Mount Everest, the highest of [#permalink]
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