GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

 It is currently 02 Apr 2020, 22:46

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Changes in the composition of the light of a supernova—an exploding

Author Message
TAGS:

### Hide Tags

Manager
Joined: 12 Mar 2007
Posts: 149
Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

Updated on: 06 Apr 2018, 20:08
1
16
00:00

Difficulty:

5% (low)

Question Stats:

80% (00:52) correct 20% (01:13) wrong based on 608 sessions

### HideShow timer Statistics

Changes in the composition of the light of a supernova—an exploding star—reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas.

(A) reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas

(B) reveals not only what chemical elements are in the explosion but also the speed at which the outer layers of stellar gas are expanding

(C) not only reveal the chemical elements in the explosion but also the speed of the expanding outer layers of stellar gas

(D) not only reveal what chemical elements are in the explosion but also the speed of the outer layers of stellar gas when they are expanding

(E) reveal not only the chemical elements in the explosion but also the speed at which the outer layers of stellar gas are expanding

Originally posted by leeye84 on 17 Mar 2007, 14:08.
Last edited by hazelnut on 06 Apr 2018, 20:08, edited 3 times in total.
Edited the question.
Intern
Status: Professional GMAT Trainer
Affiliations: GMAT Coach
Joined: 21 Mar 2017
Posts: 12
Location: United States
GMAT 1: 760 Q50 V44
GMAT 2: 770 Q51 V44
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

30 Mar 2018, 12:14
3
jrk23 wrote:
I was confused with subject here, not sure whether it was "Changes" or "an exploding star".

Subject will not be in prep phrase.

In this example on what grounds we decide that "an exploding star" is not a subject.

Thanks in advance for the help.

Rgds,
Ram

Hi jrk23,

Here are 3 ways to decide:

1) Punctuation

A pair of dashes is similar to parentheses, or 2 commas. " - an exploding star -" just serves to define what a supernova is.

You are correct that "Subject will not be in prep phrase".

"in the composition of the light of a supernova - an exploding star -" is a common tactic by the test writers to distract you from the subject, "Changes"

For subject-verb issues, ignore modifiers such as this and simplify it to "Changes reveal".

2) Structure

If "reveals" is the verb for "an exploding star", then "Changes" would be hanging without a verb. A common error is to have no main verb for a subject.

3) Meaning

"Changes reveal" fits better with the intended meaning.

Is it the star ITSELF that reveals the chemical elements in the explosion and speed of expanding the outer layers?

Or is it the changes in the composition of light?
_________________
6 Principles for Effective GMAT Training: https://www.gmatcoach.com/our-approach/

I offer online tutoring -- please visit gmatcoach.com/trial to request a free consultation.
Retired Moderator
Status: enjoying
Joined: 19 Feb 2007
Posts: 5448
Location: India
WE: Education (Education)
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

19 Dec 2018, 07:00
3
Top Contributor
There is no need to gallop to solve this entry-level question if you are thorough with some SAT level grammar

Step 1. Eliminate A and B since the plural subject 'changes' does not synchronize with the singular verb 'reveals'

Step 2. All the three of them use the correlative conjunction not only… but also. The thumb rule of correlative conjunction parallelism is that what is on the right side of not only should also be there on the right side of but also, in letter and spirit

In C and D, "not only" is followed by the verb -reveal- while 'but also' is followed by a noun.

Only E puts a noun after both "not only" … "but also."
_________________
One-to-one video private sessions on SC +91 98845 44509, <newnaren@gmail.com>
Senior Manager
Joined: 24 Aug 2006
Posts: 490
Location: Dallas, Texas
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

17 Mar 2007, 20:28
1
(E)

Reveal not only A but also B is the correct form.

In other choices ||ism is broken by saying "Not only reveal A but also <needed>"
Director
Joined: 12 Dec 2015
Posts: 506
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

23 Jul 2019, 22:52
1
Changes in the composition of the light of a supernova--an exploding star--reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas.

(A) reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas —> “changes” is plural, so “reveals” is wrong

(B) reveals not only what chemical elements are in the explosion but also the speed at which the outer layers of stellar gas are expanding —> same as A

(C) not only reveal the chemical elements in the explosion but also the speed of the expanding outer layers of stellar gas —> wrong: not only “reveal” ... but also “the speed”

(D) not only reveal what chemical elements are in the explosion but also the speed of the outer layers of stellar gas when they are expanding—> wrong: not only “reveal” ... but also “the speed”

(E) reveal not only the chemical elements in the explosion but also the speed at which the outer layers of stellar gas are expanding—> correct: not only “the elements” ... but also “the speed”
Manager
Joined: 12 Mar 2007
Posts: 149
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

17 Mar 2007, 18:56
I had C on my first try. I understand the S-V agreement, but how is the parallelism in place here?
Intern
Joined: 25 Mar 2013
Posts: 2
Location: United States
GMAT 1: 630 Q44 V33
GPA: 3.4
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

03 Jul 2013, 09:11
I think the options B, C and D breaks the parallelism rule. Not only X but also Y, X and Y should be parallel. A and E both have parallel X and Y but they A is incorrect due to its faulty S-V agreement (Changes .... reveals), Hence I picked E
Pls correct me if I am wrong
PS
Manager
Joined: 26 Sep 2017
Posts: 115
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

24 Feb 2018, 19:18
1
I was confused with subject here, not sure whether it was "Changes" or "an exploding star".

Subject will not be in prep phrase.

In this example on what grounds we decide that "an exploding star" is not a subject.

Thanks in advance for the help.

Rgds,
Ram
Intern
Joined: 19 Dec 2018
Posts: 45
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

19 Dec 2018, 04:24
Subject in this sentence is “Changes” which is in plural form. So, it doesn’t get along with singular “reveals”. Hence, A and B are out. In answer choice C, “speed of expansion” should replace “speed of expanding”. “not only” is used wrongly in Choice D. It should follow “reveal”. “not only” preceding “reveal” means it is just not only revealing but also doing something else. E has correct Subject-verb agreement and the use of adverb. Hence, E is the answer
Manager
Joined: 12 Jan 2019
Posts: 50
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

12 Jan 2019, 21:53
Subject in this sentence is “Changes” which is in plural form. So, it doesn’t get along with singular “reveals”. Hence, A and B are out. In answer choice C, “speed of expansion” should replace “speed of expanding”. “not only” is used wrongly in Choice D. It should follow “reveal”. “not only” preceding “reveal” means it is just not only revealing but also doing something else. E has correct Subject-verb agreement and the use of adverb. Hence, E is the answer.
Director
Joined: 24 Oct 2016
Posts: 619
GMAT 1: 670 Q46 V36
GMAT 2: 690 Q47 V38
Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

26 Jul 2019, 06:30
leeye84 wrote:
Changes in the composition of the light of a supernova—an exploding star—reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas.

(A) reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas

(B) reveals not only what chemical elements are in the explosion but also the speed at which the outer layers of stellar gas are expanding

(C) not only reveal the chemical elements in the explosion but also the speed of the expanding outer layers of stellar gas

(D) not only reveal what chemical elements are in the explosion but also the speed of the outer layers of stellar gas when they are expanding

(E) reveal not only the chemical elements in the explosion but also the speed at which the outer layers of stellar gas are expanding

Main Issues:

1) Correct Idiom: "Not only X but also Y"
2) Subject Verb agreement

(A) reveals not only the chemical elements in the explosion but also the speed of expanding the outer layers of stellar gas - Wrong: SV 2) Meaning distortion

(B) reveals not only what chemical elements are in the explosion but also the speed at which the outer layers of stellar gas are expanding - Wrong: SV

(C) not only reveal the chemical elements in the explosion but also the speed of the expanding outer layers of stellar gas - Wrong: Parallelism issue

(D) not only reveal what chemical elements are in the explosion but also the speed of the outer layers of stellar gas when they are expanding - Wrong: Parallelism issue 2) Meaning distortion

(E) reveal not only the chemical elements in the explosion but also the speed at which the outer layers of stellar gas are expanding - Correct
Intern
Joined: 15 May 2019
Posts: 2
GMAT 1: 530 Q39 V25
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

10 Aug 2019, 09:21
Changes is plural
Reveals is plural form. Why is everyone saying reveals is singular form? i am very confused by that.
SVP
Joined: 27 Mar 2010
Posts: 1719
Location: India
Schools: ISB
GPA: 3.31
Re: Changes in the composition of the light of a supernova—an exploding  [#permalink]

### Show Tags

10 Aug 2019, 19:15
schooliscool wrote:
Changes is plural
Reveals is plural form. Why is everyone saying reveals is singular form? i am very confused by that.

Hi schooliscool, that's the funny thing about English: For the most part, Nouns are plural when they end in "s" while Verbs are singular when when they end in "s".

Since reveals is a verb that ends in "s", reveals is singular (reveal would be plural).
_________________
Thanks,
Ashish
GMAT-99th Percentile, MBA - ISB Hyderabad
EducationAisle, Bangalore

Sentence Correction Nirvana available on Amazon.in and Flipkart

Join us for a free GMAT Live Online Class from anywhere in the world
Re: Changes in the composition of the light of a supernova—an exploding   [#permalink] 10 Aug 2019, 19:15
Display posts from previous: Sort by