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# In 1975 Chinese survey teams remeasured Mount Everest

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Intern
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02 May 2017, 03:51
Can anyone explain the answer to question 1st/.
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02 May 2017, 03:53
Can anyone explain answer to the first question of this passage. Marked as Q32
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Re: In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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02 May 2017, 19:01
Can any one explain why the answer for Question 32 is D instead of C .
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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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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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24 Nov 2017, 00:27
7 mins 20 seconds.
Got all correct.
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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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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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28 Mar 2018, 00:17
Q1 What is problem with option 'c'
and why 'd' is correct?
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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.

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

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10 Oct 2018, 05:09
Took 7 Minutes , got all answers correct.
Can someone help me judge my speed here ? 7 minutes too much for this passage ?
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Re: In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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12 Oct 2018, 10:29
Congrats on the awesome score buddy!!!A lot of people die to get that...

This should take less than 5 min I think for those aiming above 750.I got 3/4 seeing that the first question is controversial anyways.Finished in 5:20
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21 Oct 2018, 05:42
All these OAs have been uploaded wrong.
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22 Oct 2018, 00:00
Need help in Q1 - how can it be option d? and why not option A?
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20 Mar 2019, 18:14
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  [#permalink]

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19 Apr 2019, 00:42
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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In 1975 Chinese survey teams remeasured Mount Everest  [#permalink]

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20 Apr 2019, 09:29
Thanks! IEsailor
Can someone explain the second question? I made it D but OA seems to be B. Thanks.
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Updated on: 21 Apr 2019, 04:19
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  [#permalink]

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21 Apr 2019, 01:35
Hi, can anyone offer an explanation for Question 32?. Why D is the correct answer choice?
Re: In 1975 Chinese survey teams remeasured Mount Everest   [#permalink] 21 Apr 2019, 01:35

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