Tough LSAT CR Question : GMAT Critical Reasoning (CR)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 18 Jan 2017, 04:41

### 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 June
Open Detailed Calendar

# Tough LSAT CR Question

Author Message
TAGS:

### Hide Tags

Intern
Joined: 14 Feb 2012
Posts: 29
Followers: 0

Kudos [?]: 5 [0], given: 6

### Show Tags

09 Oct 2013, 00:44
00:00

Difficulty:

25% (medium)

Question Stats:

79% (02:25) correct 21% (01:36) wrong based on 144 sessions

### HideShow timer Statistics

Modern navigation systems, which are found in most of today's commercial aircraft, are made with low-power circuitry, which is more susceptible to interference than the vacuum-tube circuitry found in older planes. During landing, navigation systems receive radio signals from the airport to guide the plane to the runway. Recently, one plane with low-power circuitry veered off course during landing, its dials dimming, when a passenger turned on a laptop computer. Clearly, modern aircraft navigation systems are being put at risk by the electronic devices that passengers carry on board, such as cassette players and laptop computers.

Which one of the following, if true, LEAST strengthens the argument above?

(A) After the laptop computer was turned off, the plane regained course and its navigation instruments and dials returned to normal.

(B) When in use all electronic devices emit electromagnetic radiation, which is known to interfere with circuitry.

(C) No problems with navigational equipment or instrument dials have been reported on flights with no passenger-owned electronic devices on board.

(D) Significant electromagnetic radiation from portable electronic devices can travel up to eight meters, and some passenger seats on modern aircraft are located within four meters of the navigation systems.

(E) Planes were first equipped with low-power circuitry at about the same time portable electronic devices became popular.

Question has already been posted, without discussion.
Please discuss, OA will be posted later on.
[Reveal] Spoiler: OA
If you have any questions
New!
Intern
Joined: 13 Aug 2013
Posts: 42
Followers: 0

Kudos [?]: 32 [3] , given: 44

Re: Tough LSAT CR Question [#permalink]

### Show Tags

09 Oct 2013, 01:05
3
KUDOS
Straight E.

Pl note that the question asked is what "least strengthens"(not weaken) the argument. So each of the 4 incorrect answer choices will strengthen the conclusion of the argument.

Conclusion: Modern electronic aircraft navigation system is at risk because of the electronic devices that passengers on board carry.

(A) After the laptop computer was turned off, the plane regained course and its navigation instruments and dials returned to normal.
Strengthens. This clearly strengthens the argument by stating that a laptop might have caused the problem in the navigation instruments and dials. Hence out

(B) When in use all electronic devices emit electromagnetic radiation, which is known to interfere with circuitry.
Strengthens. Clearly implies that all electronic devices will cause problems to the circuitry. Hence out

(C) No problems with navigational equipment or instrument dials have been reported on flights with no passenger-owned electronic devices on board.
Strengthens.Creates a correlation between electronic devices and problems with navigational equipment or instrument dials. Hence out

(D) Significant electromagnetic radiation from portable electronic devices can travel up to eight meters, and some passenger seats on modern aircraft are located within four meters of the navigation systems.
Strengthens. This option again directly mentions that electronic devices within an 8 meter range can harm the navigation systems. Hence out

(E) Planes were first equipped with low-power circuitry at about the same time portable electronic devices became popular.
Does not strengthen. This option ideally does nothing as far as the conclusion is concerned. It neither strengthens nor weakens the argument. Hence correct

Hence E is correct

Hope its clear
_________________

Kudos plz if it helped

Intern
Joined: 10 Aug 2013
Posts: 23
GPA: 4
WE: Military Officer (Transportation)
Followers: 0

Kudos [?]: 9 [0], given: 10

Re: Tough LSAT CR Question [#permalink]

### Show Tags

11 Oct 2013, 11:03
I am with E.

other all strengthen the statement but E not appropriate option to strengthen argument.
Manager
Joined: 08 Jun 2015
Posts: 159
Location: India
GMAT 1: 640 Q48 V29
Followers: 1

Kudos [?]: 3 [0], given: 71

Re: Tough LSAT CR Question [#permalink]

### Show Tags

01 May 2016, 07:47
E is the clear winner here Good explanations above !
_________________

" The few , the fearless "

Re: Tough LSAT CR Question   [#permalink] 01 May 2016, 07:47
Similar topics Replies Last post
Similar
Topics:
1 Tough and Tricky CR Question sets 3 25 Dec 2015, 06:46
1 Hand Picked Lsat CR Questions 5 23 Sep 2014, 18:47
1 Tough CR questions..More to follow.. 1. Contrary to the 14 18 Jan 2010, 07:34
LSAT CR 1 01 Apr 2008, 11:22
CR 1000 (LSAT questions) 7 27 May 2007, 15:32
Display posts from previous: Sort by