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

It is currently 20 Jun 2019, 02:20

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

Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir

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

Hide Tags

 
Manager
Manager
avatar
G
Joined: 30 Dec 2016
Posts: 235
GMAT 1: 650 Q42 V37
GPA: 4
WE: Business Development (Other)
Premium Member Reviews Badge
Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 08 Feb 2018, 14:42
3
5
Question 1
00:00
A
B
C
D
E

based on 181 sessions

46% (02:38) correct 54% (03:19) wrong

HideShow timer Statistics

Question 2
00:00
A
B
C
D
E

based on 179 sessions

44% (01:17) correct 56% (01:27) wrong

HideShow timer Statistics

Question 3
00:00
A
B
C
D
E

based on 185 sessions

28% (01:28) correct 72% (01:12) wrong

HideShow timer Statistics

Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were first synthesized in the 1880s. Because they conduct heat but not electricity and are water-insoluble, fire-resistant, and extremely stable (withstanding temperatures of up to 1600° F), they were found, in the 1930s, to be extremely useful as components in cooling systems and electrical equipment (transformers and capacitors). They were widely used for these purposes and also in the composition of sealants, rubber, paints, plastics, inks, and insecticides.

PCBs were banned in 1979, after researchers linked them to cancer and developmental problems in humans. However, PCBs persist in the environment for extremely long periods. Because of an affinity for fat, they have a marked tendency to accumulate in living organisms; increasing in concentration as they move up the food chain.

At sites where dumping of chemical wastes had occurred, such as warehouses, landfills, and even rivers, uncontrolled or abandoned hazardous wastes still remained. To locate, investigate, and clean up the worst of these sites nationwide, Congress in 1980 established the Superfund Program, administered by the Environmental Protection Agency (EPA). Due to dumping over a period of 35 years by two capacitor manufacturing plants located along the northern part of the Hudson River in New York State, EPA has estimated that 1.1 million pounds of PCBs have accumulated.

Field surveys of the river have found substantial contamination in 40 submerged sediment ―hot spots,‖ 5 exposed shoreline remnant deposits, dredge spoils on riverbanks, and estuary sediments. Today, because of PCB contamination, human consumption of fish caught in the most affected areas of the Hudson River is prohibited. But, while fish consumption remains the most potent route of PCB exposure, exposure can also occur through other routes. Eight municipalities currently draw drinking water from the Hudson and another, New York City, draws it during emergencies.

EPA‘s report recommending dredging indicates that, due to opposition of local residents, neither a landfill nor a thermal treatment facility (for high temperature incineration) can be locally-sighted and the PCBs should therefore be transported to a solid waste landfill outside of the area. The report does not, however, identify a specific location.

Furthermore, air along the river contains elevated concentrations of PCBs, and individuals living along the River show PCB residue in their bodies, paralleling the river's contamination. The EPA has recommended that PCBs be removed from the river bottom by dredging, thus reducing contamination and possibly eventually permitting revitalization of commercial fishing, which once generated $40 million income annually. However, the corporation blamed for the dumping argues that dredging may ―stir up‖ the PCBs (which they describe as now ―lying undisturbed‖ in the riverbed), causing the water, air, and riverbanks to become even more contaminated. Some area residents echo these concerns and also argue that dredging will subject them to years of unacceptable noise, disruption, and curtailed recreational activities.

1. Based on information provided by the author of the passage, it can be inferred from the passage that PCBs are:

I. heavier than water.
II. toxic to fish
III. readily biodegradable.
A. I only
B. I and II only
C. I and III only
D. II and III only
E. I, II and III


2. According to the passage, the EPA differs from local residents and the company responsible for PCB contamination in that it affirms that it bases its recommended action on benefit to:

A. commercial fishing interests.
B. residential interests.
C. the environment as a whole.
D. recreational activities.
E. the general American populace


3. It can be inferred from the passage that the justification used for prohibiting individuals from consuming fish caught in contaminated sections of the Hudson River is that the individuals may thereby:

A. reduce the level of PCBs in their bodies.
B. avoid any further increase in the level of PCBs in their bodies.
C. mitigate the accumulation of PCBs in their bodies.
D. prevent cancer and developmental problems.
E. cause a reduction in their health insurance premium


_________________
Regards
SandySilva


____________
Please appreciate the efforts by pressing +1 KUDOS (:
Manager
Manager
avatar
G
Joined: 30 Dec 2016
Posts: 235
GMAT 1: 650 Q42 V37
GPA: 4
WE: Business Development (Other)
Premium Member Reviews Badge
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 13 Feb 2018, 02:40
2
Responding to a P.M.
OE for Q3.
3) Why are individuals prohibited from eating fish from contaminated areas of the Hudson? Review the mechanism described in ¶2: PCBs increase in concentration as they move up the food chain, and so eating fish from contaminated areas would increase the PCB concentration in the person eating the fish. It can be inferred that the fish ban is in place to prevent this from happening; (C) fits.

(A): Distortion. Though not eating the fish may reduce the rate of increase in PCB concentration, there‘s no indication that simply avoiding contaminated fish will reduce PCB concentration overall.

(B): Distortion. As above, though not eating the fish will reduce the rate of increase, this doesn‘t mean that it will eliminate the increase altogether; there are still other possible sources of contamination.

(C): The correct answer

(D): Distortion. Simply reducing the rate of increase won‘t necessarily eliminate all risk factors for cancer and developmental problems, which could come from any number of sources, non-fish-borne PCBs included.

(E): Health insurance premium outside the scope of the passage


_________________
Regards
SandySilva


____________
Please appreciate the efforts by pressing +1 KUDOS (:
Intern
Intern
avatar
B
Joined: 04 Sep 2011
Posts: 14
Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 14 Feb 2018, 05:50
Its infact directly stated in the Second paragraph last line ,
PCBs can get accumulated in living organism as they move up in the food chain.
The passage never states that the level of PCB or so,
hence the answer clearly is C

Because of an affinity for fat, they have a marked tendency to accumulate in living organisms;
increasing in concentration as they move up the food chain.


Hope this reply helps, if so click Kudos :)
Intern
Intern
avatar
S
Joined: 26 Apr 2017
Posts: 46
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 14 Feb 2018, 18:51
1
Please comment on the reasoning on Q3.

It can be inferred from the passage that the justification used for prohibiting individuals from consuming fish caught in contaminated sections of the Hudson River is that the individuals may thereby:

A. reduce the level of PCBs in their bodies.
Because of an affinity for fat, they have a marked tendency to accumulate in living organisms; increasing in concentration as they move up the food chain.
Furthermore, air along the river contains elevated concentrations of PCBs, and individuals living along the River show PCB residue in their bodies, paralleling the river's contamination.

Explanation:
B. avoid any further increase in the level of PCBs in their bodies.
Explanation: . Because of an affinity for fat, they have a marked tendency to accumulate in living organisms; increasing in concentration as they move up the food chain.
ie. Human is the last of the food chain, so it will not increase the level of PCB.

C. mitigate the accumulation of PCBs in their bodies.
Explanation: .
Because of an affinity for fat, they have a marked tendency to accumulate in living organisms; increasing in concentration as they move up the food chain.
Furthermore, air along the river contains elevated concentrations of PCBs, and individuals living along the River show PCB residue in their bodies, paralleling the river's contamination.
ie. PCB can be obtained from other sources, therefore, if human does not consume fish that is contaminated; the action will reduced the level of PCB in the body.

D. prevent cancer and developmental problems.
Does not explicitly mentioned that it will prevent cancer and developmental problems

E. cause a reduction in their health insurance premium
Not mentioned in the passage
Manager
Manager
avatar
G
Joined: 12 Mar 2017
Posts: 224
Location: India
Concentration: Strategy, General Management
GMAT 1: 630 Q49 V27
GPA: 4
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 13 Mar 2018, 11:04
Didn't really understand why the answer to Q.2 is A. The passage says that " The EPA has recommended that PCBs be removed from the river bottom by dredging, thus reducing contamination and POSSIBLY eventually permitting revitalization of commercial fishing". Clearly the commercial fishing revitalization isn't the main motive behind this.
Manager
Manager
avatar
B
Joined: 04 Feb 2016
Posts: 67
Location: India
Concentration: Technology, Marketing
GMAT 1: 650 Q48 V32
GPA: 4
WE: Sales (Computer Software)
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 28 Mar 2018, 07:44
Can someone help with q1? I could find support that refute 2 and 3 but what about 1?

Guess worked for A, overall all correct . What are the chances of seeing such long passages in actual GMAT?

Tx.
_________________
GMAT1 650 Q48 V32.
Manager
Manager
avatar
B
Joined: 17 Sep 2017
Posts: 89
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 21 May 2019, 10:26
Prateek176 wrote:
Didn't really understand why the answer to Q.2 is A. The passage says that " The EPA has recommended that PCBs be removed from the river bottom by dredging, thus reducing contamination and POSSIBLY eventually permitting revitalization of commercial fishing". Clearly the commercial fishing revitalization isn't the main motive behind this.



Hi, I have the same doubt. as well. Can anyone offer an explanation on this?
Intern
Intern
avatar
B
Joined: 22 Sep 2017
Posts: 40
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 23 May 2019, 08:06
Someone please explain question no 1 in detail
Manager
Manager
avatar
S
Joined: 29 Jan 2019
Posts: 66
Location: India
GPA: 4
WE: Business Development (Computer Software)
Premium Member CAT Tests
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 26 May 2019, 01:53
1
AmarRajput wrote:
Someone please explain question no 1 in detail



I. heavier than water.
II. toxic to fish
III. readily biodegradable.

I: CORRECT and can be deduced from the statement that "sediments are settled down in the river"
II: Passage never stated that PCB is toxic to fishes; However, it is harmful to People if they will consume fish, which are present in PCB contaminated water.
III: PCB is not biodegradable, this is why it lasts for Years.

Hence; Option 1 is correct

Thanks = KUDOS
Intern
Intern
avatar
B
Joined: 30 May 2018
Posts: 22
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 03 Jun 2019, 22:16
MagooshExpert please explain question no 2
Manager
Manager
avatar
S
Joined: 29 Jan 2019
Posts: 66
Location: India
GPA: 4
WE: Business Development (Computer Software)
Premium Member CAT Tests
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 04 Jun 2019, 08:56
Bishal123456789 wrote:
MagooshExpert please explain question no 2


B, C, and E are out because 'recommended actions' are not going to benefit them.

it is b/w A and D

acc. to passage: "The EPA has recommended that PCBs be removed from the river bottom by dredging, thus reducing contamination and possibly eventually permitting revitalization of commercial fishing

it surely tells that recommended actions are going to benefit commercial fishing interests; Hence Option A is Correct.

Thanks = KUDOS
Magoosh GMAT Instructor
User avatar
G
Joined: 30 Oct 2017
Posts: 227
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir  [#permalink]

Show Tags

New post 08 Jun 2019, 17:44
Bishal123456789 wrote:
MagooshExpert please explain question no 2

Hi Bishal123456789,

Happy to help! :)

Here's the relevant part of the passage for question 2:

Quote:
The EPA has recommended that PCBs be removed from the river bottom by dredging, thus reducing contamination and possibly eventually permitting revitalization of commercial fishing, which once generated $40 million income annually.


This part specifically tells us that the EPA's recommendation is specifically motivated by the revitalization of commercial fishing, so A is our answer :)

The rest of the passage goes on to describe the concerns of the corporation and local residents, which match the other answer choices, in contrast to the EPA's motivation.

I hope that helps! :)
-Carolyn
_________________
GMAT Club Bot
Re: Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir   [#permalink] 08 Jun 2019, 17:44
Display posts from previous: Sort by

Polychlorinated biphenyls are heavy, syrupy hydrocarbons that were fir

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


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