GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 19 Dec 2018, 08:26

# TODAY:

MIT Sloan R1 Decisions - Join MIT Chat for Live Updates | Chat with UCLA Anderson Adcom @9am PT | Chat with Yale SOM R1 Admit 10am PT

### 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

## Events & Promotions

###### Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### Happy Christmas 20% Sale! Math Revolution All-In-One Products!

December 20, 2018

December 20, 2018

10:00 PM PST

11:00 PM PST

This is the most inexpensive and attractive price in the market. Get the course now!
• ### Key Strategies to Master GMAT SC

December 22, 2018

December 22, 2018

07:00 AM PST

09:00 AM PST

Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.

# GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn

Author Message
TAGS:

### Hide Tags

Verbal Forum Moderator
Status: Greatness begins beyond your comfort zone
Joined: 08 Dec 2013
Posts: 2130
Location: India
Concentration: General Management, Strategy
Schools: Kelley '20, ISB '19
GPA: 3.2
WE: Information Technology (Consulting)
Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

### Show Tags

29 Aug 2016, 23:50
Took 5 mins 10 seconds , including 2 mins 10 seconds to read
-The author describes a theory put forth by an astronomer
- The author the points out certain astronomers' concerns regarding the theory
- The author then addresses those concerns

1.

2. "The gravity of a MACHO that had so drifted, astronomers agree, would cause the star's light rays, which would otherwise diverge, to bend together so that, as observed from Earth, the star would temporarily appear to brighten"

3.
"all of a star's colors are equally affected by microlensing. Thus, if a MACHO magnifies a star's red light tenfold, it will do the same to the star's blue light and yellow light."
_________________

When everything seems to be going against you, remember that the airplane takes off against the wind, not with it. - Henry Ford
The Moment You Think About Giving Up, Think Of The Reason Why You Held On So Long
+1 Kudos if you find this post helpful

Board of Directors
Status: Stepping into my 10 years long dream
Joined: 18 Jul 2015
Posts: 3625
Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

### Show Tags

26 Oct 2016, 23:40
Easy Passage. Time Taken : 5 mins. All Correct.
_________________

My GMAT Story: From V21 to V40
My MBA Journey: My 10 years long MBA Dream
My Secret Hacks: Best way to use GMATClub | Importance of an Error Log!
Verbal Resources: All SC Resources at one place | All CR Resources at one place

GMAT Club Inbuilt Error Log Functionality - View More.
New Visa Forum - Ask all your Visa Related Questions - here.
New! Best Reply Functionality on GMAT Club!
Find a bug in the new email templates and get rewarded with 2 weeks of GMATClub Tests for free
Check our new About Us Page here.

Director
Joined: 06 Jan 2015
Posts: 531
Location: India
Concentration: Operations, Finance
GPA: 3.35
WE: Information Technology (Computer Software)
Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

### Show Tags

19 Jan 2017, 20:57
In the 1980's, astronomer Bohdan Paczynski proposed a way of determining whether the enormous dark halo constituting the outermost part of the Milky Way galaxy is composed of MACHO's (massive compact halo objects), which are astronomical objects too dim to be visible. Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way. The gravity of a MACHO that had so drifted, astronomers agree, would cause the star's light rays, which would otherwise diverge, to bend together so that, as observed from Earth, the star would temporarily appear to brighten, a process known as microlensing. Because many individual stars are of intrinsically variable brightness, some astronomers have contended that the brightening of intrinsically variable stars can be mistaken for microlensing. However, whereas the different colors of light emitted by an intrinsically variable star are affected differently when the star brightens, all of a star's colors are equally affected by microlensing. Thus, if a MACHO magnifies a star's red light tenfold, it will do the same to the star's blue light and yellow light. Moreover, it is highly unlikely that a star in the Large Magellanic Cloud will undergo microlensing more than once, because the chance that a second MACHO would pass in front of exactly the same star is minuscule.

2. According to the passage, Paczynski's theory presumes that if MACHO's constituted the Milky Way's dark halo, occasionally a MACHO would
A. drift so as to lie in a direct line between two stars in the outer Milky Way
B. affect the light rays of a star in the Large Magellanic Cloud with the result that the star would seem for a time to brighten
C. become obscured as a result of the microlensing of a star in the Large Magellanic Cloud
D. temporarily increase the apparent brightness of a star in the Large Magellanic Cloud by increasing the gravity of the star
E. magnify each color in the spectrum of a star in the Large Magellanic Cloud by a different amount

Hi sayantanc2k / Experts,

Can somebody explain In Question 2, why not option A is correct? In the passage it says "Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way."
_________________

आत्मनॊ मोक्षार्थम् जगद्धिताय च

Resource: GMATPrep RCs With Solution

Senior Manager
Status: Active
Affiliations: NA
Joined: 23 Oct 2012
Posts: 272
GMAT 1: 590 Q50 V21
GMAT 2: 600 Q48 V25
GMAT 3: 730 Q51 V37
GPA: 3.5
Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

### Show Tags

31 Jan 2017, 08:00
NandishSS wrote:
In the 1980's, astronomer Bohdan Paczynski proposed a way of determining whether the enormous dark halo constituting the outermost part of the Milky Way galaxy is composed of MACHO's (massive compact halo objects), which are astronomical objects too dim to be visible. Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way. The gravity of a MACHO that had so drifted, astronomers agree, would cause the star's light rays, which would otherwise diverge, to bend together so that, as observed from Earth, the star would temporarily appear to brighten, a process known as microlensing. Because many individual stars are of intrinsically variable brightness, some astronomers have contended that the brightening of intrinsically variable stars can be mistaken for microlensing. However, whereas the different colors of light emitted by an intrinsically variable star are affected differently when the star brightens, all of a star's colors are equally affected by microlensing. Thus, if a MACHO magnifies a star's red light tenfold, it will do the same to the star's blue light and yellow light. Moreover, it is highly unlikely that a star in the Large Magellanic Cloud will undergo microlensing more than once, because the chance that a second MACHO would pass in front of exactly the same star is minuscule.

2. According to the passage, Paczynski's theory presumes that if MACHO's constituted the Milky Way's dark halo, occasionally a MACHO would
A. drift so as to lie in a direct line between two stars in the outer Milky Way
B. affect the light rays of a star in the Large Magellanic Cloud with the result that the star would seem for a time to brighten
C. become obscured as a result of the microlensing of a star in the Large Magellanic Cloud
D. temporarily increase the apparent brightness of a star in the Large Magellanic Cloud by increasing the gravity of the star
E. magnify each color in the spectrum of a star in the Large Magellanic Cloud by a different amount

Hi sayantanc2k / Experts,

Can somebody explain In Question 2, why not option A is correct? In the passage it says "Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way."

Hi,
This question is actually a 'Specific' type of RC question that requires paraphrase of something directly from the passage ( no assumption) .The statment in option A can not be justified by passage. In passage line related to this mentioned is 'Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way' . If you read carefully , nowhere star's position is mentioned to be in a line between two stars. We have to find a answer which can be inferred from the passage .
_________________

#If you like my post , please encourage me by giving Kudos

Intern
Joined: 06 Sep 2016
Posts: 10
Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

### Show Tags

12 Feb 2017, 12:15
3min 40 sec including reading time. All correct.
Current Student
Joined: 31 Dec 2015
Posts: 53
Location: India
GMAT 1: 670 Q44 V38
GMAT 2: 680 Q44 V39
Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

### Show Tags

21 Feb 2017, 07:36
Time Taken: 3 mins 49 seconds. All correct.

Interesting passage. One method that helps me in such technical passages is to actually "view" the whole scenario in my mind. for eg: the Milky way, the Halo and how it affects stars(lights diverging etc..) It helps in better understanding since I already have a mental image of the whole scenario while reading the questions.
Intern
Joined: 27 Nov 2016
Posts: 43
Location: India
Schools: ISB '19
GPA: 2.75
GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

### Show Tags

25 Sep 2017, 18:04
1
5 mins. Easy passage I guess. All correct too.
_________________

Please appreciate with a kudo if my post is helpful to you

Manager
Joined: 09 Nov 2016
Posts: 61
Location: India
Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

### Show Tags

03 Nov 2017, 04:37
1
This passage is too technical and was really hard to understand. I got the answers as E, B & D.

Are there any tips to tackle such passages?
Intern
Joined: 19 Jul 2017
Posts: 34
Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn  [#permalink]

### Show Tags

07 Sep 2018, 08:17
arunrnair wrote:
All correct.

Time : 8 min 20 sec.

First question consumed a lot.

Accuracy is improving ... but only small variations in time..

All correct.

Time : 7 min 55 sec.
_________________

You never FAIL until you stop TRYING

[wrapimg=][/wrapimg]

Re: GMATPREP ChallengeQ -In the 1980's, astronomer Bohdan Paczyn &nbs [#permalink] 07 Sep 2018, 08:17

Go to page   Previous    1   2   [ 29 posts ]

Display posts from previous: Sort by