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# Most of the power plants dispose of their waste water, used

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Joined: 23 Aug 2011
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Most of the power plants dispose of their waste water, used [#permalink]

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12 Sep 2012, 07:40
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95% (hard)

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36% (02:33) correct 64% (01:52) wrong based on 398 sessions

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Most of the power plants dispose of their waste water, used to cool the plant, in wastelands or dried up rivers. Central water research institute, which monitors underground water quality for its consistency, report that uranium makes up for an ever increasing percentage of water pollutants in samples the institute collect. Hence, the efforts to decrease the amount of uranium in waste water that power plants dispose without treating are yielding no results.

Which of the following statements most seriously weakens the argument.

a.)The government has already spent millions of $$to check contamination of ground water by uranium. b.)The powerplants are now switching to better technologies which result in almost negligible uranium waste. c.)With the application of various governement initatives to check water pollution,the proportion of major water pollutants such as arsenic, fluorides which used to be reported earlier has been considerably reduced. d.)While the percentage of power produced by power plants has increased, the amount of uranium used is unchanged. e.)Because uranium is radioactive in nature,most of the power plants are using certain technologies that can control and limit uranium's radioactivity. [Reveal] Spoiler: OA _________________ Whatever one does in life is a repetition of what one has done several times in one's life! If my post was worth it, then i deserve kudos Manager Status: faciendo quod indiget fieri Joined: 13 Mar 2012 Posts: 88 Followers: 0 Kudos [?]: 31 [5] , given: 4 Re: Most of the power plants dispose of their waste water [#permalink] ### Show Tags 12 Sep 2012, 08:42 5 This post received KUDOS 1 This post was BOOKMARKED conty911 wrote: Most of the power plants dispose of their waste water, used to cool the plant, in wastelands or dried up rivers. Central water research institute, which monitors underground water quality for its consistency, report that uranium makes up for an ever increasing percentage of water pollutants in samples the institute collect. Hence, the efforts to decrease the amount of uranium in waste water that power plants dispose without treating are yielding no results. Which of the following statements most seriously weakens the argument. a.)The government has already spent millions of$$ to check contamination of ground water by uranium.
b.)The powerplants are now switching to better technologies which result in almost negligible uranium waste.
c.)With the application of various governement initatives to check water pollution,the proportion of major water pollutants such as arsenic, fluorides which used to be reported earlier has been considerably reduced.
d.)While the percentage of power produced by power plants has increased, the amount of uranium used is unchanged.
e.)Because uranium is radioactive in nature,most of the power plants are using certain technologies that can control and limit uranium's radioactivity.

As the highlighted part states that uranium is ever increasing; and the last line is that efforts to decrease uranium are failing. The best way to weaken this would be to prove that efforts are not failing and the reason that Uranium has increased in percentage is that other pollutants have decreased. Therefore answer is C

We are weakening it by providing an alternative reason to the conclusion.
Joined: 28 May 2012
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Kudos [?]: 54 [0], given: 11

Re: Most of the power plants dispose of their waste water, used [#permalink]

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17 Sep 2012, 21:05
conty911 wrote:
Most of the power plants dispose of their waste water, used to cool the plant, in wastelands or dried up rivers. Central water research institute, which monitors underground water quality for its consistency, report that uranium makes up for an ever increasing percentage of water pollutants in samples the institute collect. Hence, the efforts to decrease the amount of uranium in waste water that power plants dispose without treating are yielding no results.

Which of the following statements most seriously weakens the argument.

a.)The government has already spent millions of $$to check contamination of ground water by uranium. -> doesnt matter what govt has already spent. b.)The powerplants are now switching to better technologies which result in almost negligible uranium waste - I found this a good contender but then it says the efforts have reduced after what power plants dispose off, without treating. c.)With the application of various governement initatives to check water pollution,the proportion of major water pollutants such as arsenic, fluorides which used to be reported earlier has been considerably reduced.- gives an alternate route to understand why the % of uranium has increased ( this is because all other pollutants have reduced ) d.)While the percentage of power produced by power plants has increased, the amount of uranium used is unchanged. - doesn't give us anything substantial e.)Because uranium is radioactive in nature,most of the power plants are using certain technologies that can control and limit uranium's radioactivity. - out of scope literally ! I went for B initially but then on reading the question again I came down the correct choice C. _________________ You want something, go get it . Period ! Senior Manager Status: Prevent and prepare. Not repent and repair!! Joined: 13 Feb 2010 Posts: 275 Location: India Concentration: Technology, General Management GPA: 3.75 WE: Sales (Telecommunications) Followers: 9 Kudos [?]: 69 [0], given: 282 Re: Most of the power plants dispose of their waste water, used [#permalink] ### Show Tags 18 Sep 2012, 03:02 I still think B is the ans. How can C weaken the arguement.?? Can anyone explain. _________________ I've failed over and over and over again in my life and that is why I succeed--Michael Jordan Kudos drives a person to better himself every single time. So Pls give it generously Wont give up till i hit a 700+ BSchool Thread Master Joined: 28 May 2012 Posts: 138 Location: India Concentration: General Management, Strategy GPA: 3.33 WE: Information Technology (Retail) Followers: 3 Kudos [?]: 54 [1] , given: 11 Re: Most of the power plants dispose of their waste water, used [#permalink] ### Show Tags 18 Sep 2012, 03:20 1 This post received KUDOS rajathpanta wrote: I still think B is the ans. How can C weaken the arguement.?? Can anyone explain. Hey, we need not worry that power factories are now switching to better methods to reduce uranium waste. The stem talks about those factories, which produce waste without treating and what measures do govt take to reduce the % of uranium among the pollutants? Make sense? _________________ You want something, go get it . Period ! Director Affiliations: SAE Joined: 11 Jul 2012 Posts: 509 Location: India Concentration: Strategy, Social Entrepreneurship GMAT 1: 710 Q49 V37 GPA: 3.5 WE: Project Management (Energy and Utilities) Followers: 42 Kudos [?]: 206 [1] , given: 269 Re: Most of the power plants dispose of their waste water, used [#permalink] ### Show Tags 18 Sep 2012, 03:33 1 This post received KUDOS +1 C Premise - Most of the power plants dispose of their waste water, used to cool the plant, in wastelands or dried up rivers. Central water research institute, which monitors underground water quality for its consistency, report that uranium makes up for an ever increasing percentage of water pollutants in samples the institute collect Conclusion - Hence, the efforts to decrease the amount of uranium in waste water that power plants dispose without treating are yielding no results. Anything which weakens the conclusion is our answer i.e anything which proves that the efforts are yielding results is our answer a.)The government has already spent millions of$$ to check contamination of ground water by uranium. (Irrelevant)
b.)The power plants are now switching to better technologies which result in almost negligible uranium waste. (Not related to governments effort)
c.)With the application of various government initiatives to check water pollution, the proportion of major water pollutants such as arsenic, fluorides which used to be reported earlier has been considerably reduced. (Percentage problem, this clearly shows that other contaminants has decreased because of governemnt initiatives and the uranium content remained the same, thus showing an increase in the overall uranium content. This is our answer)
d.)While the percentage of power produced by power plants has increased, the amount of uranium used is unchanged. (Irrelevant, nothing is given to relate the efficiency to population)
e.)Because uranium is radioactive in nature, most of the power plants are using certain technologies that can control and limit uranium's radioactivity. (Not related to governments effort)

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Re: Most of the power plants dispose of their waste water, used [#permalink]

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18 Sep 2012, 05:59
5
KUDOS
Expert's post
rajathpanta wrote:
I still think B is the ans. How can C weaken the arguement.?? Can anyone explain.

Report says that uranium makes up for an ever increasing percentage of water pollutants (i.e. the % of uranium in the total amount of pollutants is increasing). Note here that it doesn't say that % of uranium in water samples is increasing.
e.g. if uranium made up 2% of the total pollutants before, it now makes up 3% of the total pollutants.
What is happening to the % of total pollutants in the water is not known.

Conclusion: Efforts to decrease the amount of uranium are not working.

We want to weaken the conclusion i.e. we want to show that the efforts could be working.

Option (C) says that the proportion of other major water pollutants is decreasing. This could explain the increase in the proportion of uranium in the pollutants.

Think of values to understand this:

Say, % of total pollutants in the water sample is 5% i.e. in 100 lts of water, there's 5 lts of pollutants.
The 5 lt is made up of uranium, arsenic etc. Say, uranium is 1 lt and the others are 4 lts i.e. uranium is 20% of the total pollutants.
Now what if the amount of other pollutants go down from 4lts to 1 lt due to govt's efforts and amount of uranium goes down from 1 lt to 0.5 lt. The proportion of uranium has gone up to 33% of the total pollutants.
Even though proportion of uranium has increased, the efforts are working since the amount of uranium pollutant went down. Hence we have weakened the conclusion.
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews GMAT Club Legend Joined: 01 Oct 2013 Posts: 9250 Followers: 804 Kudos [?]: 165 [0], given: 0 Re: Most of the power plants dispose of their waste water, used [#permalink] ### Show Tags 05 Feb 2014, 11:39 Hello from the GMAT Club VerbalBot! Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos). Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. GMAT Club Legend Joined: 01 Oct 2013 Posts: 9250 Followers: 804 Kudos [?]: 165 [0], given: 0 Re: Most of the power plants dispose of their waste water, used [#permalink] ### Show Tags 06 Jun 2015, 11:50 Hello from the GMAT Club VerbalBot! Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos). Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. Manager Status: I am ready! Joined: 05 Nov 2014 Posts: 55 Location: India GMAT 1: 700 Q49 V35 Followers: 0 Kudos [?]: 10 [0], given: 362 Re: Most of the power plants dispose of their waste water, used [#permalink] ### Show Tags 06 Jun 2015, 11:54 Amazing question.. Sometimes my head just shuts down when I do CRs ..I have no idea how to effectively answer every time. I guess one reason maybe because I dint spend enough time on them Intern Joined: 20 Aug 2014 Posts: 34 Followers: 0 Kudos [?]: 4 [0], given: 6 Re: Most of the power plants dispose of their waste water, used [#permalink] ### Show Tags 15 Nov 2015, 21:07 Answer C cannot be a correct option... Conclusion in detail is Efforts to reduce the amount of uranium in Waster Water generated from Power Plants is not yielding results... The conclusion does not talk about reducing the amount of Uranium in general, rather it is more concerned about the Waste Water -uranium content in detail. Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 6830 Location: Pune, India Followers: 1926 Kudos [?]: 11957 [0], given: 221 Re: Most of the power plants dispose of their waste water, used [#permalink] ### Show Tags 11 Mar 2016, 03:21 conty911 wrote: Most of the power plants dispose of their waste water, used to cool the plant, in wastelands or dried up rivers. Central water research institute, which monitors underground water quality for its consistency, report that uranium makes up for an ever increasing percentage of water pollutants in samples the institute collect. Hence, the efforts to decrease the amount of uranium in waste water that power plants dispose without treating are yielding no results. Which of the following statements most seriously weakens the argument. a.)The government has already spent millions of$$to check contamination of ground water by uranium. b.)The powerplants are now switching to better technologies which result in almost negligible uranium waste. c.)With the application of various governement initatives to check water pollution,the proportion of major water pollutants such as arsenic, fluorides which used to be reported earlier has been considerably reduced. d.)While the percentage of power produced by power plants has increased, the amount of uranium used is unchanged. e.)Because uranium is radioactive in nature,most of the power plants are using certain technologies that can control and limit uranium's radioactivity. Responding to a pm: Quote: My Doubt - What if Uranium content in the water remains same and only others are going down e.g. Uranium is still 1 ltr and other pollutants have been dropped to 1 ltr then Uranium's concentration is still the same and proportion has increased , this could also lead to that industries are not doing anything to reduce concentration from 1 ltr to further below ? Look at the argument: "...report that uranium makes up for an ever increasing percentage of water pollutants in samples the institute collect." Hence, the efforts to decrease the amount of uranium in waste water that power plants dispose without treating are yielding no results. We are deducing the conclusion (underlined) from the given data. When we add option (C) to the mix, we cannot make the conclusion anymore. It is possible that the efforts to control Uranium are yielding results but the efforts to reduce other pollutants are also yielding results. Hence (C) certainly weakens our conclusion. Remember, our conclusion is still possible. Just that it is weaker now. _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

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Re: Most of the power plants dispose of their waste water, used   [#permalink] 11 Mar 2016, 03:21
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