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In 1975 Chinese survey teams remeasured Mount Everest

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Re: In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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New post 02 May 2017, 19:01
Can any one explain why the answer for Question 32 is D instead of C .
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Re: In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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New post 05 Jun 2017, 10:01
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  [#permalink]

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New post 04 Jul 2017, 12:27
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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  [#permalink]

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New post 09 Sep 2017, 03:43
Hi GMATNinja ,

Can you please put some light on the first question. It seems that option C makes sense but the OA is D.
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Re: In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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New post 24 Nov 2017, 00:27
7 mins 20 seconds.
Got all correct.
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Re: In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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New post 24 Nov 2017, 09:26
Time taken - 10 mins

Got 3/4 correct. Need to improve on the Timing!!
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Re: In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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New post 10 Dec 2017, 23:15
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  [#permalink]

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New post 11 Dec 2017, 18:49
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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.

Hope that's helpful! :-)
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Re: In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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New post 28 Mar 2018, 00:17
Q1 What is problem with option 'c'
and why 'd' is correct?
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In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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New post 02 Jul 2018, 05:40
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.
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."


OA: C
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Re: In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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New post 03 Jul 2018, 23:26
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
Re: In 1975 Chinese survey teams remeasured Mount Everest &nbs [#permalink] 03 Jul 2018, 23:26

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