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

It is currently 15 Oct 2018, 03:43

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Science journalist: Brown dwarfs are celestial objects with more mass

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Manager
Manager
avatar
Joined: 10 Feb 2014
Posts: 104
GMAT 1: 690 Q50 V33
GMAT ToolKit User
Science journalist: Brown dwarfs are celestial objects with more mass  [#permalink]

Show Tags

New post Updated on: 05 Sep 2014, 21:48
5
00:00
A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

44% (02:50) correct 56% (02:52) wrong based on 179 sessions

HideShow timer Statistics

Science journalist: Brown dwarfs are celestial objects with more mass than planets but less mass than stars. They are identified by their mass and whether or not lithium is present in their atmospheres. Stars at least as massive as the Sun have lithium remaining in their atmospheres because the mixing of elements in their internal nuclear furnaces is incomplete. Stars with less mass than the Sun have no lithium because the element has been fully mixed into their nuclear furnaces and consumed. A brown dwarf does not have a fully functional nuclear furnace and so its lithium cannot be consumed.

Which one of the following is most is most strongly suppported by the science journalist's statements?

A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun.

B. Any celestial object with lithum in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.

C. No celestial object that has no lithium in its atmosphere is a brown dwarf.

D. No celestial object with lithium in its atmosphere has less mass than the Sun.

E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.

I liked this question! Guys give it a try! OA later..

Originally posted by itzmyzone911 on 05 Sep 2014, 00:26.
Last edited by itzmyzone911 on 05 Sep 2014, 21:48, edited 1 time in total.
Director
Director
avatar
Joined: 05 Sep 2010
Posts: 731
GMAT ToolKit User Premium Member
Re: Science journalist: Brown dwarfs are celestial objects with more mass  [#permalink]

Show Tags

New post 05 Sep 2014, 00:54
i picked C : No celestial object that has no lithium in its atmosphere is a brown dwarf.

faults:
A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun.--->cannot be sure. we are told that stars having less mass than stars have no lithium .from this we cannot conclude that "Any celestial object without lithium in its atmosphere is a star " . it can be a planet !!

B. Any celestial object with lithum in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.---------->directly contradicts the premise W.D has no such reactor

C. No celestial object that has no lithium in its atmosphere is a brown dwarf.---->correct . B.D must have lithium !!

D. No celestial object with lithium in its atmosphere has less mass than the Sun.----->directly contradicts the premise. these B.D are refuting it

E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.---->planet can have lithium and yet they can have less mass !!
Senior Manager
Senior Manager
avatar
Joined: 05 Nov 2012
Posts: 474
Concentration: Technology, Other
GMAT ToolKit User Premium Member Reviews Badge
Re: Science journalist: Brown dwarfs are celestial objects with more mass  [#permalink]

Show Tags

New post 05 Sep 2014, 01:55
4
Science journalist: Brown dwarfs are celestial objects with more mass than planets but less mass than stars.
They are identified by their mass and whether or not lithium is present in their atmospheres.
Stars at least as massive as the Sun have lithium remaining in their atmospheres because the mixing of elements in their internal nuclear furnaces is incomplete.
Stars with less mass than the Sun have no lithium because the element has been fully mixed into their nuclear furnaces and consumed.
A brown dwarf does not have a fully functional nuclear furnace and so its lithium cannot be consumed.

Which one of the following is most is most strongly suppported by the science journalist's statements?

A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun. [arg here is limited to stars]
B. Any celestial object with lithium in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.[we know this only abt star not other CO]
C. No celestial object that has no lithium in its atmosphere is a brown dwarf. [look at the bold stmt]
D. No celestial object with lithium in its atmosphere has less mass than the Sun.[we only abt star]
E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.[planets r those CO but dont know abt the theor lthm composition.]
Intern
Intern
User avatar
Joined: 09 Jun 2014
Posts: 5
Location: India
Abhishek: Abhi
Re: Science journalist: Brown dwarfs are celestial objects with more mass  [#permalink]

Show Tags

New post 05 Sep 2014, 02:33
IMO D
D . No celestial object with lithium in its atmosphere has less mass than the Sun.
This means that If any Celestial object has lithium in its atmosphere, then it cant have less mass than sun.
Intern
Intern
avatar
B
Joined: 19 Sep 2017
Posts: 36
WE: Account Management (Other)
GMAT ToolKit User
Re: Science journalist: Brown dwarfs are celestial objects with more mass  [#permalink]

Show Tags

New post 16 Apr 2018, 22:09
itzmyzone911 wrote:
Science journalist: Brown dwarfs are celestial objects with more mass than planets but less mass than stars. They are identified by their mass and whether or not lithium is present in their atmospheres. Stars at least as massive as the Sun have lithium remaining in their atmospheres because the mixing of elements in their internal nuclear furnaces is incomplete. Stars with less mass than the Sun have no lithium because the element has been fully mixed into their nuclear furnaces and consumed. A brown dwarf does not have a fully functional nuclear furnace and so its lithium cannot be consumed.

Which one of the following is most is most strongly suppported by the science journalist's statements?



Conditions to be a brown dwarf: planet<mass<star , unconsumed lithium in its environment.


A. Any celestial object without lithium in its atmosphere is a star with less mass than the Sun.

B. Any celestial object with lithum in its atmosphere has a nuclear furnace that has incompletely mixed the object's elements.

C. No celestial object that has no lithium in its atmosphere is a brown dwarf. Correct,!

D. No celestial object with lithium in its atmosphere has less mass than the Sun.

E. No celestial object less massive than a brown dwarf has lithium in its atmosphere.

I liked this question! Guys give it a try! OA later..[/quote]
GMAT Club Bot
Re: Science journalist: Brown dwarfs are celestial objects with more mass &nbs [#permalink] 16 Apr 2018, 22:09
Display posts from previous: Sort by

Science journalist: Brown dwarfs are celestial objects with more mass

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.