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Determining the authenticity of purported pre-Columbian

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Re: CR carbon 14 [#permalink] New post 10 Aug 2011, 06:59
Tough one.
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CR notes
http://gmatclub.com/forum/massive-collection-of-verbal-questions-sc-rc-and-cr-106195.html#p832142
http://gmatclub.com/forum/1001-ds-questions-file-106193.html#p832133
http://gmatclub.com/forum/gmat-prep-critical-reasoning-collection-106783.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html?hilit=chineseburned

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Re: CR carbon 14 [#permalink] New post 10 Aug 2011, 07:41
Here comes the dumbest reply....i ddnt even understand the question forget about answering...

btw can anyone help me understand the technique of solving such questions which require reference to other stuff..(thgh um nt expecting any revert but it wld b nice to have a help)
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Re: CR carbon 14 [#permalink] New post 10 Aug 2011, 11:00
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Re: CR carbon 14 [#permalink] New post 10 Aug 2011, 13:37
amitjash wrote:
tough one...
I have one question ... how you will distiguish between the grinding on axe by nature and by its use (as it is an axe)??? I have doubt


The problem with this one is the potential is there that the axe was never used. Even if it was though, the gridding marks from an earthquake likely would be different than the striking marks during the use of the axe. While C is also a tempting answer choice as it doesn't state exactly where the object was found, D is absolutely the best answer as the cape is already black and you can't see scratches on it (bringing a microscope into the equation is bringing information way too far out of the original passage to disqualify this answer).

Answer is definitely D.
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Re: CR carbon 14 [#permalink] New post 10 Aug 2011, 16:16
yes the answer is D
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Re: CR carbon 14 [#permalink] New post 12 Aug 2011, 06:23
I guess Mr -T gave a good explanation, ideas was where both of the identification methods would not work! options other than D defy only one option.
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Re: CR carbon 14 [#permalink] New post 14 Aug 2011, 15:56
D

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Re: CR carbon 14 [#permalink] New post 03 Sep 2011, 23:58
I chose C. But good explanations here.

It should be D.
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Re: CR carbon 14 [#permalink] New post 06 Sep 2011, 04:14
D nice discussion....
only option where both the criterias can't work
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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 18 May 2012, 16:54
This one is easy D but i think the paragraph is quite long for a typical CR question. I dont think GMAT question can be that long though.
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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 19 May 2012, 02:02
Right answer should not fit in either of the criteria :
- gridding (Scratch on surface) should work
- darkening (any color that can have darker shade after darkening) should work

So, D (A black feather cape) is the only one that seems right answer considering black can't get further dark and feather is so soft that it can't have any scratch on it's surface.

Having said that, this question keeps gates open for dispute as there can be darker shade of color 'Black' and even feather can have scratches if seen by microscope :-)
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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 14 Aug 2012, 05:28
can you please tell me the source !
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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 14 Aug 2012, 05:36
I was able to answer correctly only after looking the dictionary for the meanings of bold words :P :) :cry:

(A) An ax head of black obsidian, unearthed from a kitchen midden
(B) A pottery bowl with a red ocher design, found in the ruins of a temple
(C) A set of gold ear weights, ornamented with jasper pendants
(D) A black feather cape from a king’s burial vault
E) A multicolored woven sash found near the gravesite of a slave

Grinding effects :-> applicable to solid objects such as pottery, ornaments ,metals etc...
darkening: applicable to those objects which are not already black or dark.
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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 14 Aug 2012, 06:41
I think Darkening won't work in E as sash is multicolored and so, the darkened part could be assumed/mistaken with is multicolor nature. And as it is sash, 'gridding' too won't work.
I am sure black can be seen as darkened relative it its overall black color.

I will choose E here.

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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 29 Aug 2012, 07:25
I chose D using the POE here. My reasoning was similar to a few other responses posted above.

(A) and (D) both have black coloured artifact so darkening scenario will not work for these 2 options. So it comes down do the fact that scratches will be least helpful in resolving A or D. Here I chose D sensing that feathers might not reflect scratches. They could have been teared apart but scratches on feathers seem a rather far cry.
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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 29 Aug 2012, 10:04
this question looks like a riddle ratjher than a cr problem
every answer can be explained the way test taker want to

controversial stuff
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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 07 Sep 2012, 21:48
+1 D

The cape cannot show scratchs or a darkening on its surface.
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Re: CR carbon 14 [#permalink] New post 14 Aug 2013, 01:49
Thanks :)
TommyWallach wrote:
Hey All,

Lots of discussion on this one. Let's see what I can do...

Determining the authenticity of purported pre-Columbian artifacts is never easy. Carbon-14 dating of these artifacts is often impossible due to contamination by radioactive palladium (which occurs naturally in the soils of Central and South America). However, historians and anthropologists have evolved two reliable criteria, which, utilized in combination, have proven effective for dating these artifacts. First, because authentic pre-Columbian artifacts characteristically occur in a coarse, granular matrix that is shifted by major earthquakes, they often exhibit the unique scratch patterns known as gridding. In addition, true pre-Columbian artifacts show a darkening in surface color that is caused by centuries of exposure to the minute amounts of magnesium in the soil of the Americas.

The criteria above would be LEAST useful in judging the authenticity of which of the following?

Breakdown. We have two methods: Check earthquake-related gridding and check for magnesium darkening. Where will these fail?

(A) An ax head of black obsidian, unearthed from a kitchen midden
PROBLEM: Darkening wouldn't work here (because it's black), but gridding would still work (obsidian is just glassy rock).

(B) A pottery bowl with a red ocher design, found in the ruins of a temple
PROBLEM: Both gridding and darkening would work here.

(C) A set of gold ear weights, ornamented with jasper pendants
PROBLEM: Both gridding and darkening would work here.

(D) A black feather cape from a king’s burial vault
ANSWER: It's black, so you can't check darkening, and it's made of feathers, so there won't be any gridding on the surface.

(E) A multicolored woven sash found near the gravesite of a slave
ANSWER: Gridding wouldn't work here (fabric), but darkening still would.

The answer is definitely D. Fun!

-tommy
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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 14 Aug 2013, 09:23
D

I would like to add only...

A burial vault is not the same as a buried vault. The word "burial" is an adjective pertaining to the type of vault. Whereas, if the sentence had "buried", it would describe the condition of the vault - it would be buried. I know that it's a subtle difference, but the meaning is drastically different. Answer D provides as the better answer choice - whether or not you can actually prove one or another with a microscope, etc.

In any case, at least we can say that this adjective "burial" was inserted by the author to trick test-takers..
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Re: Determining the authenticity of purported pre-Columbian [#permalink] New post 14 Aug 2013, 15:15
Expert's post
gmatfighter12 wrote:
This one is easy D but i think the paragraph is quite long for a typical CR question. I dont think GMAT question can be that long though.

This post is pretty old, but it never got answered and some other folks have brought this thread back from the dead. So: yes, they can! GMAT CR questions are typically a bit shorter than this, but some of them can be long paragraphs. Flip through the Official Guide, and you'll see a few examples of textually dense passages like this one. On such passages, it's vitally important that you start with the question stem. You can't spend a long time reading the text, so you need to know what you are looking for before you dive in!

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Re: Determining the authenticity of purported pre-Columbian   [#permalink] 14 Aug 2013, 15:15
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