Art historians are using a process known as infrared : GMAT Sentence Correction (SC)
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# Art historians are using a process known as infrared

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Director
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Art historians are using a process known as infrared [#permalink]

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31 Jul 2007, 10:37
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33% (02:41) correct 67% (00:11) wrong based on 6 sessions

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954. Art historians are using a process known as infrared scanning in analyzing the Mona Lisa to determine if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done by many artists of the time.
(A) if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done
(B) if it had been altered since completion and if Leonardo da Vinci first sketched the figure in black, a practice employed
(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed
(D) whether it was altered since completion and whether Leonardo da Vinci first sketched the figure in black, as was done
E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done

Why is C the answer instead of E? "a practice employed by" versus "a practice done by" Is "done by" frowned upon for GMAT answers?
Anybody have any ideas?
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Re: SC 1000 #954 employed by vs done by [#permalink]

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31 Jul 2007, 10:46
beckee529 wrote:
954. Art historians are using a process known as infrared scanning in analyzing the Mona Lisa to determine if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done by many artists of the time.
(A) if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done
(B) if it had been altered since completion and if Leonardo da Vinci first sketched the figure in black, a practice employed
(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed
(D) whether it was altered since completion and whether Leonardo da Vinci first sketched the figure in black, as was done
E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done

Why is C the answer instead of E? "a practice employed by" versus "a practice done by" Is "done by" frowned upon for GMAT answers?
Anybody have any ideas?

It's a test of IF versus Whether and as is usual - whether usually prevails.

Second - it's not so much a matter of DONE BY being frowned upon - a practice employed SUMS UP whether Leonardo sketched it in black - which could alternatively have been summed up by saying - AS WAS CUSTOMARY IN THOSE DAYS - The authors however have taken the SUMMATIVE MODIFIER route and have stated A PRACTICE EMPLOYED instead.
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Re: SC 1000 #954 employed by vs done by [#permalink]

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31 Jul 2007, 10:58
dwivedys wrote:
beckee529 wrote:
954. Art historians are using a process known as infrared scanning in analyzing the Mona Lisa to determine if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done by many artists of the time.
(A) if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done
(B) if it had been altered since completion and if Leonardo da Vinci first sketched the figure in black, a practice employed
(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed
(D) whether it was altered since completion and whether Leonardo da Vinci first sketched the figure in black, as was done
E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done

Why is C the answer instead of E? "a practice employed by" versus "a practice done by" Is "done by" frowned upon for GMAT answers?
Anybody have any ideas?

It's a test of IF versus Whether and as is usual - whether usually prevails.

Second - it's not so much a matter of DONE BY being frowned upon - a practice employed SUMS UP whether Leonardo sketched it in black - which could alternatively have been summed up by saying - AS WAS CUSTOMARY IN THOSE DAYS - The authors however have taken the SUMMATIVE MODIFIER route and have stated A PRACTICE EMPLOYED instead.

Thanks! That really helps..

(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed

E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done

I also noticed another subtle difference....
Director
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Re: SC 1000 #954 employed by vs done by [#permalink]

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31 Jul 2007, 14:16
I like C here!

Let me try to explain C and E.

(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed

E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done

Firstly, I dont see any reason why we should use "had been".
Secondly, practice is employed, not done; "done" leaves all kind of doubts in the mind of a reader as to what the author is trying to say
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Re: SC 1000 #954 employed by vs done by [#permalink]

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31 Jul 2007, 20:28
beckee529 wrote:
954. Art historians are using a process known as infrared scanning in analyzing the Mona Lisa to determine if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done by many artists of the time.
(A) if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done
(B) if it had been altered since completion and if Leonardo da Vinci first sketched the figure in black, a practice employed
(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed
(D) whether it was altered since completion and whether Leonardo da Vinci first sketched the figure in black, as was done
E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done

Why is C the answer instead of E? "a practice employed by" versus "a practice done by" Is "done by" frowned upon for GMAT answers?
Anybody have any ideas?

C .

The key to answer this question is to understand the tenses.

A and B are out because of 'if'.

C, D and E present altered in 3 different tenses

C - Present perfect since it uses has altered.
D - Simple past tense
E - Past perfect tense.

The point worth noting here is that if the painting has been altered multiple times it will remain altered since it can't be restored to its original state. That means that alteration happened in the past and it remains altered. Hence this is a case of present perfect tense as the event (alteration) started in the past continues today. For the same reason D is out since it cannot be past tense.

E is incorrect because the 2 events of alteration and Da vinci skecthing the figure in ... are dis-connected. Had they been connected with one following the other, this could have been the best choice..

Hope this helps..
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Re: SC 1000 #954 employed by vs done by [#permalink]

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05 Sep 2007, 13:10
beckee529 wrote:
dwivedys wrote:
beckee529 wrote:
954. Art historians are using a process known as infrared scanning in analyzing the Mona Lisa to determine if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done by many artists of the time.
(A) if it has been altered since completion and if Leonardo da Vinci first sketched the figure in black, as done
(B) if it had been altered since completion and if Leonardo da Vinci first sketched the figure in black, a practice employed
(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed
(D) whether it was altered since completion and whether Leonardo da Vinci first sketched the figure in black, as was done
E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done

Why is C the answer instead of E? "a practice employed by" versus "a practice done by" Is "done by" frowned upon for GMAT answers?
Anybody have any ideas?

It's a test of IF versus Whether and as is usual - whether usually prevails.

Second - it's not so much a matter of DONE BY being frowned upon - a practice employed SUMS UP whether Leonardo sketched it in black - which could alternatively have been summed up by saying - AS WAS CUSTOMARY IN THOSE DAYS - The authors however have taken the SUMMATIVE MODIFIER route and have stated A PRACTICE EMPLOYED instead.

Thanks! That really helps..

(C) whether it has been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice employed

E) whether it had been altered since completion and whether Leonardo da Vinci first sketched the figure in black, a practice done

I also noticed another subtle difference....

it is NOT SUBTLE. That is the key to solving this sentence. When you see Since, or Once, it should be followed by present perfect.

This is a 15 second question testing 2 concepts. Whether & Since.
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Re: SC 1000 #954 employed by vs done by [#permalink]

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03 Jun 2010, 23:45
I dont think your concept is airtight in all cases. Read this SC.
sc-study-published-by-dr-myrna-weissman-43258-20.html

We have past perfect+since in the OA.

Quote:
it is NOT SUBTLE. That is the key to solving this sentence. When you see Since, or Once, it should be followed by present perfect.

This is a 15 second question testing 2 concepts. Whether & Since.

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Re: SC 1000 #954 employed by vs done by [#permalink]

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04 Jun 2010, 23:28
IMO : C

D is wrong : simple past tense and

"as was done" doesnt look good. should be "as it was done"

a practice employed > a practice done
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Re: SC 1000 #954 employed by vs done by [#permalink]

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10 Jun 2010, 07:10
C for me.

Hi ykaiim, I think the 'since' and 'once' with present perfect is not air tight rule but it works that way most of the times.
Re: SC 1000 #954 employed by vs done by   [#permalink] 10 Jun 2010, 07:10
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