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Kirchoff's laws - OG 12 Diagnostic

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Kirchoff's laws - OG 12 Diagnostic

by rahulvsd » Wed Apr 25, 2012 7:19 am
In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.
(A) laws, an observation about electric current first made in 1845 and
(B) laws, which was an observation about electric current first made in 1845 and it is
(C) laws, namely, it was an observation about electric current first made in 1845 and
(D) laws, an observation about electric current first made in 1845, it is
(E) laws that was an observation about electric current, first made in 1845, and is

[spoiler]OA: A. Need a confirmation on wrong answers B and E. The usage of which and that in the options I think are correct. B is wrong because 'it' violates parallelism. E is wrong because the presence of first comma changes the meaning of the sentence.
[/spoiler]
Last edited by rahulvsd on Wed Apr 25, 2012 8:48 am, edited 1 time in total.
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by jordan23 » Wed Apr 25, 2012 7:50 am
B and E are incorrect because the use of WAS in the sentence means that this particular law in question no longer exists. This is not the case, as that law is still there and hence we cannot use the past form with it.

Also, do take few seconds to underline the question stem.
rahulvsd wrote:In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.
(A) laws, an observation about electric current first made in 1845 and
(B) laws, which was an observation about electric current first made in 1845 and it is
(C) laws, namely, it was an observation about electric current first made in 1845 and
(D) laws, an observation about electric current first made in 1845, it is
(E) laws that was an observation about electric current, first made in 1845, and is

[spoiler]OA: A. Need a confirmation on wrong answers B and E. The usage of which and that in the options I think are correct. B is wrong because 'it' violates parallelism. E is wrong because the presence of first comma changes the meaning of the sentence.
[/spoiler]
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by GmatKiss » Thu Apr 26, 2012 7:19 am
In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.

(A) laws, an observation about electric current first made in 1845 and

(B) laws, which was an observation about electric current first made in 1845 and it is

(C) laws, namely, it was an observation about electric current first made in 1845 and

(D) laws, an observation about electric current first made in 1845, it is

(E) laws that was an observation about electric current, first made in 1845, and is

IMO: A
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