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It is equally well known that a GPS satellite needs an extremely accur

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It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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It is equally well known that a GPS satellite needs an extremely accurate clock to function correctly; it is less well known however, that GPS satellites also need to adjust for the effects of time dilation, because time passes more slowly on the satellite than it does on earth.


(A) It is equally well known that a GPS satellite needs an extremely accurate clock to function correctly; it is less well known however, that GPS satellites also need to adjust for the effects of time dilation, because time passes more slowly on the satellite than it does on earth.

(B) An extremely accurate clock is as essential to the functioning of a GPS satellite as is the need to take a phenomenon, called time dilation, according to which time passes relatively slowly on the satellite than on the earth, into account.

(C) An extremely accurate clock is as important to the correct functioning of GPS satellite as to taking into account a phenomenon called time dilation because time passes slower on the satellite than that on the earth.

(D) Because time passes slowly on the satellite than on earth, due to time dilation, an extremely accurate clock is needed for the proper functioning of a GPS satellite so as to account for the same.

(E) From the perspective of an observer on the earth, time passes more slowly on the satellite than on the earth; this phenomenon, called time dilation, must be taken into account for even a GPS satellite equipped with an extremely accurate on-board clock to function correctly.


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[Reveal] Spoiler: OA

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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It is equally well known that a GPS satellite needs an extremely accurate clock to function correctly; it is less well known however, that GPS satellites also need to adjust for the effects of time dilation, because time passes more slowly on the satellite than it does on earth.


(E) (Correct Choice) From the perspective of an observer on the earth, time passes more slowly on the satellite than on the earth; this phenomenon, called time dilation, must be taken into account for even a GPS satellite equipped with an extremely accurate on-board clock to function correctly.



1. Can’t make out what this question is trying to convey; the perspective of an observer on the earth is never mentioned in the original. Nor does this intrusion serve any purpose in the correct choice.

2. Original says that GPS satellites also need to adjust for the effects of time dilation; but the correct choice says that time dilation must be taken in to account. Must be taken into account by whom, by that satellite or any other person or thing?

3. What is the phrase ‘to function correctly’ modifying – Is it the clock or the satellite?
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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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Why is A incorrect?
does the semicolon used in (E) make sense?
can anyone tell me?
thanks!

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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It is absurd to use this construction [[equally well known ....... less well known however]] => equally cannot show contrast => (A) is incorrect

Semicolon in (E) makes perfect sense => It is connecting two independent clauses. These are two closely related statements, each able to stand alone as an independent sentence.

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 22 Sep 2016, 13:03
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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 30 Nov 2016, 19:05
I had it down to B and E. Can someone please explain why B is eliminated?

Thanks in advance!!!

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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lawiniecke wrote:
I had it down to B and E. Can someone please explain why B is eliminated?

Thanks in advance!!!


The relative pronoun "which" wrongly refers to "time dilation". The fact that time passes slowly is not according to time dilation; this phenomenon itself is time dilation.

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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The correct answer should be B.

I doubt the construction "for even a GPS satellite equipped" is correct.

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 01 Dec 2016, 08:20
devbond wrote:
The correct answer should be B.

I doubt the construction "for even a GPS satellite equipped" is correct.

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The post just above yours explains why B is incorrect.

Why do you feel that the constrcution "for even a GPS satellite equipped" is incorrect? "Equipped" is a past participle (not a verb) acting as a modifier for "GPS satellite".

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 01 Dec 2016, 08:50
"According to which" , where which refers to time dilation. Correct ?
The way I understand it is .. according to the "time dilation theory" time passes slowly on the satellite than on earth.

The time "may/may not pass slower" in reality but the theory does say it does.
That's why I thought which was referring to the theory correctly.

Also on re-reading I find E to be grammatically correct to . So the deal breaker between B and E has to be meaning right ?

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 03 Dec 2016, 07:13
devbond wrote:
"According to which" , where which refers to time dilation. Correct ?
The way I understand it is .. according to the "time dilation theory" time passes slowly on the satellite than on earth.

The time "may/may not pass slower" in reality but the theory does say it does.
That's why I thought which was referring to the theory correctly.

Also on re-reading I find E to be grammatically correct to . So the deal breaker between B and E has to be meaning right ?

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The word "theory" is missing in option B, hence "which" does not have any antecedent. In B "time dilation" is the phenomenon itself - i.e. time does indeed slow down, not the theory that time slows down. Compare with the following:

Buoyancy keeps a ship floating on water.... correct.
This phenomenon is called buoyancy, according to which a ship floats on water... wrong.

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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(A) It is equally well known that a GPS satellite needs an extremely accurate clock to function correctly; it is less well known however, that GPS satellites also need to adjust for the effects of time dilation, because time passes more slowly on the satellite than it does on earth.

1) In this option, the sentence presents a contrast that fact1 is well known, however fact2 isn't. It is equally well known...it is less swell know

2) I believe the last part of the sentence should be like this: ...because the time passes more slowly on the satellite thanon the earth 'it does' interrupts the comparison.

(B) An extremely accurate clock is as essential to the functioning of a GPS satellite as is the need to take a phenomenon, called time dilation, according to which time passes relatively slowly on the satellite than on the earth, into account.

1) X is as essential to Y as Z. The is in as is the need to take a phenomenon troubles me.
2) when we are talking about something as important as the proper functioning of a satellite, shouldn't we use "the phenomenon" rather than "a phenomenon"



(C) An extremely accurate clock is as important to the correct functioning of GPS satellite as to taking into account a phenomenon called time dilation because time passes slower on the satellite than that on the earth.

1) X is as important to Y as Z. Z appears to be troublesome here. I'd rather rephrase this as - An extremely accurate clock is as important to the correct functioning of GPS satellite as the consideration of Time Dilation, a phenomenon according to which...

(D) Because time passes slowly on the satellite than on earth, due to time dilation, an extremely accurate clock is needed for the proper functioning of a GPS satellite so as to account for the same.

I'd replace 'due to' with 'caused by' to check of the sentence still makes sense.

(E) From the perspective of an observer on the earth, time passes more slowly on the satellite than on the earth; this phenomenon, called time dilation, must be taken into account for even a GPS satellite equipped with an extremely accurate on-board clock to function correctly.

Although quite different from the original sentence, this option looks good.


Please correct my mistakes. I'm a novice.

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 13 Mar 2017, 11:12
nmtlzl wrote:
Why is A incorrect?
does the semicolon used in (E) make sense?
can anyone tell me?
thanks!



I read recently in my studies that the word "that" can't appear immediately after a comma this would make (A) wrong as well. It should read However it is less known that ... ...

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 03 Apr 2017, 02:59
(A) It is equally well known that a GPS satellite needs an extremely accurate clock to function correctly; it is less well known however, that GPS satellites also need to adjust for the effects of time dilation, because time passes more slowly on the satellite than it does on earth. need to is wrong, need adjusting or need to be adjusted is correct

(B) An extremely accurate clock is as essential to the functioning of a GPS satellite as is the need to take a phenomenon, called time dilation, according to which time passes relatively slowly on the satellite than on the earth, into account. - lack more

(C) An extremely accurate clock is as important to the correct functioning of GPS satellite as to taking into account a phenomenon called time dilation because time passes slower on the satellite than that on the earth.

(D) Because time passes slowly on the satellite than on earth, due to time dilation, an extremely accurate clock is needed for the proper functioning of a GPS satellite so as to account for the same. - lack more

(E) From the perspective of an observer on the earth, time passes more slowly on the satellite than on the earth; this phenomenon, called time dilation, must be taken into account for even a GPS satellite equipped with an extremely accurate on-board clock to function correctly.
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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 05 Apr 2017, 11:32
Hello expert,
I just want to ask, is this a valid gmat question, does in gmat we get such type of questions where meaning is being explained in a much better manner as compare to meaning present in main statement.

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 08 Apr 2017, 02:50
VKat wrote:
Hello expert,
I just want to ask, is this a valid gmat question, does in gmat we get such type of questions where meaning is being explained in a much better manner as compare to meaning present in main statement.


Yes, it is possible - the original sentence (wrong option) may convey a vague or wrong meaning altogether. It is not mentioned anywhere in any official document that the original sentence must convey the correct clear meaning.

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 08 Apr 2017, 08:46
IMO E, though E is too wordy, all others are wrong for sure..

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Re: It is equally well known that a GPS satellite needs an extremely accur [#permalink]

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New post 22 Apr 2017, 04:01
Prajat wrote:
It is absurd to use this construction [[equally well known ....... less well known however]] => equally cannot show contrast => (A) is incorrect

Semicolon in (E) makes perfect sense => It is connecting two independent clauses. These are two closely related statements, each able to stand alone as an independent sentence.



I always get confused with the usage of independent clauses connected by a semicolon.
" From the perspective of an observer on the earth, time passes more slowly on the satellite than on the earth; this phenomenon, called time dilation, must be taken into account for even a GPS satellite equipped with an extremely accurate on-board clock to function correctly."

The second independent clause has the word "this". Can this stand alone? If yes, how?

Please elaborate.. :|


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New post 04 Aug 2017, 07:06
I picked "E" as well but the last two words got me. How can a thing function incorrectly. To function implies correctness. Doesn't this make the phrase redundant?

Please explain and help me eliminate E.

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Re: It is equally well known that a GPS satellite needs an extremely accur   [#permalink] 04 Aug 2017, 07:06
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