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Typically during thunderstorms most lightning strikes carry a negative

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Typically during thunderstorms most lightning strikes carry a negative [#permalink]

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New post 30 May 2017, 22:34
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The Official Guide for GMAT Verbal Review 2018

Practice Question
Question No.: CR 179
Page:

Typically during thunderstorms most lightning strikes carry a negative electric charge; only a few carry a positive charge. Thunderstorms with unusually high proportions of positive-charge strikes tend to occur in smoky areas near forest fires. The fact that smoke carries positively charged smoke particles into the air above a fire suggests the hypothesis that the extra positive strikes occur because of the presence of such particles in the storm clouds.

Which of the following, if discovered to be true, most seriously undermines the hypothesis?

(A) Other kinds of rare lightning also occur with unusually high frequency in the vicinity of forest fires.
(B) The positive-charge strikes that occur near forest fires tend to be no more powerful than positive strikes normally are.
(C) A positive-charge strike is as likely to start a forest fire as a negative charge strike is.
(D) Thunderstorms that occur in drifting clouds of smoke have extra positive-charge strikes weeks after the charge of the smoke particles has dissipated.
(E) The total number of lightning strikes during a thunderstorm is usually within the normal range in the vicinity of a forest fire.
[Reveal] Spoiler: OA

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Re: Typically during thunderstorms most lightning strikes carry a negative [#permalink]

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New post 31 May 2017, 02:24
Typically during thunderstorms most lightning strikes carry a negative electric charge; only a few carry a positive charge. Thunderstorms with unusually high proportions of positive-charge strikes tend to occur in smoky areas near forest fires. The fact that smoke carries positively charged smoke particles into the air above a fire suggests the hypothesis that the extra positive strikes occur because of the presence of such particles in the storm clouds.

Type – weaken
Boil it down – Presence of positively charged smoke particles in storm causes extra positive strikes occur

(A) Other kinds of rare lightning also occur with unusually high frequency in the vicinity of forest fires.- irrelevant
(B) The positive-charge strikes that occur near forest fires tend to be no more powerful than positive strikes normally are. – the power of strikes is irrelevant
(C) A positive-charge strike is as likely to start a forest fire as a negative charge strike is. – Irrelevant – likelihood of starting a forest fire is not a concern
(D) Thunderstorms that occur in drifting clouds of smoke have extra positive-charge strikes weeks after the charge of the smoke particles has dissipated. – Correct – Although the smoke particles have dissipated , the extra positive-charge strikes are still present
(E) The total number of lightning strikes during a thunderstorm is usually within the normal range in the vicinity of a forest fire. – Irrelevant
Answer D
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Re: Typically during thunderstorms most lightning strikes carry a negative [#permalink]

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New post 31 May 2017, 02:59
D. When smoke particles dissipates then there are thunderstorms with extra positive charge.

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Re: Typically during thunderstorms most lightning strikes carry a negative [#permalink]

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New post 04 Sep 2017, 04:02
Thank you so much for your useful explanation.

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Re: Typically during thunderstorms most lightning strikes carry a negative [#permalink]

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New post 26 Oct 2017, 12:18
@Gmatninja, Experts,

Please Explain , Totally Stumped by this one

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Re: Typically during thunderstorms most lightning strikes carry a negative [#permalink]

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New post 26 Oct 2017, 12:20
hazelnut wrote:
The Official Guide for GMAT Verbal Review 2018

Practice Question
Question No.: CR 179
Page:

Typically during thunderstorms most lightning strikes carry a negative electric charge; only a few carry a positive charge. Thunderstorms with unusually high proportions of positive-charge strikes tend to occur in smoky areas near forest fires. The fact that smoke carries positively charged smoke particles into the air above a fire suggests the hypothesis that the extra positive strikes occur because of the presence of such particles in the storm clouds.

Which of the following, if discovered to be true, most seriously undermines the hypothesis?

(A) Other kinds of rare lightning also occur with unusually high frequency in the vicinity of forest fires.
(B) The positive-charge strikes that occur near forest fires tend to be no more powerful than positive strikes normally are.
(C) A positive-charge strike is as likely to start a forest fire as a negative charge strike is.
(D) Thunderstorms that occur in drifting clouds of smoke have extra positive-charge strikes weeks after the charge of the smoke particles has dissipated.
(E) The total number of lightning strikes during a thunderstorm is usually within the normal range in the vicinity of a forest fire.


I chose A as it suggests that there is some alternate cause for the lightning near the fires

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Re: Typically during thunderstorms most lightning strikes carry a negative [#permalink]

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New post 05 Nov 2017, 23:25
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Typically during thunderstorms most lightning strikes carry a negative electric charge; only a few carry a positive charge. Thunderstorms with unusually high proportions of positive-charge strikes tend to occur in smoky areas near forest fires. The fact that smoke carries positively charged smoke particles into the air above a fire suggests the hypothesis that the extra positive strikes occur because of the presence of such particles in the storm clouds.

Which of the following, if discovered to be true, most seriously undermines the hypothesis?

(A) Other kinds of rare lightning also occur with unusually high frequency in the vicinity of forest fires.
(B) The positive-charge strikes that occur near forest fires tend to be no more powerful than positive strikes normally are.
(C) A positive-charge strike is as likely to start a forest fire as a negative charge strike is.
(D) Thunderstorms that occur in drifting clouds of smoke have extra positive-charge strikes weeks after the charge of the smoke particles has dissipated.
(E) The total number of lightning strikes during a thunderstorm is usually within the normal range in the vicinity of a forest fire.

kunal1608 wrote:
GMATNinja, Experts,

Please Explain , Totally Stumped by this one

According to the author, smoky areas near forest fires probably have extra positive strikes because the smoke carries positively charged smoke particles into the air above a fire. So we need an answer choice that would undermine that hypothesis:

Quote:
(A) Other kinds of rare lightning also occur with unusually high frequency in the vicinity of forest fires.

We are trying to explain positive strikes, and we don't care about other kinds of rare lightning. Choice (A) does not impact the hypothesis, so it can be eliminated.

Quote:
(B) The positive-charge strikes that occur near forest fires tend to be no more powerful than positive strikes normally are.

We are trying to explain why there are more positive strikes in smoky areas near forest fires. The hypothesis in question has nothing to do with how powerful the strikes are, so (B) can be eliminated.

Quote:
(C) A positive-charge strike is as likely to start a forest fire as a negative charge strike is.

Again, we are trying to explain WHY there are more positive strikes in smoky areas near forest fires. The likelihood of starting a forest fire has nothing to do with the hypothesis in question, so eliminate (C).

Quote:
(D) Thunderstorms that occur in drifting clouds of smoke have extra positive-charge strikes weeks after the charge of the smoke particles has dissipated.

According to the hypothesis described by the author, smoky areas near forest fires probably have extra positive strikes because the smoke carries positively charged smoke particles into the air. In other words, the presence of extra positively charged particles (from the smoke) causes extra positive strikes. But choice (D) tells us that extra positive strikes still occur weeks after the charge of the smoke particles has dissipated. If the charge of the smoke particles has dissipated and we are still seeing extra positive strikes, then how can we blame the extra strikes on the smoke particles? Choice (D) undermines the hypothesis, so keep this one.

Quote:
(E) The total number of lightning strikes during a thunderstorm is usually within the normal range in the vicinity of a forest fire.

This tells us that the TOTAL number of strikes is normal when there is a thunderstorm near a forest fire. However, this does not say anything about WHY there are more positive strikes near a forest fire. Choice (E) is not relevant to the hypothesis and can be eliminated.

So (D) is the best of the bunch.

I hope this helps!
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Re: Typically during thunderstorms most lightning strikes carry a negative [#permalink]

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New post 10 Nov 2017, 03:58
GMATNinja wrote:
Quote:
Typically during thunderstorms most lightning strikes carry a negative electric charge; only a few carry a positive charge. Thunderstorms with unusually high proportions of positive-charge strikes tend to occur in smoky areas near forest fires. The fact that smoke carries positively charged smoke particles into the air above a fire suggests the hypothesis that the extra positive strikes occur because of the presence of such particles in the storm clouds.

Which of the following, if discovered to be true, most seriously undermines the hypothesis?

(A) Other kinds of rare lightning also occur with unusually high frequency in the vicinity of forest fires.
(B) The positive-charge strikes that occur near forest fires tend to be no more powerful than positive strikes normally are.
(C) A positive-charge strike is as likely to start a forest fire as a negative charge strike is.
(D) Thunderstorms that occur in drifting clouds of smoke have extra positive-charge strikes weeks after the charge of the smoke particles has dissipated.
(E) The total number of lightning strikes during a thunderstorm is usually within the normal range in the vicinity of a forest fire.

kunal1608 wrote:
GMATNinja, Experts,

Please Explain , Totally Stumped by this one


So (D) is the best of the bunch.

I hope this helps!


Thankyou GMATNinja

Retrospectively, the only thing i think confused me is the reasoning given for the high occurrence of positive charge strikes. I got to thinking how can +ve attract +ve.

One more question, Do you recommend reading the question stem first for CR questions or do you think it hinders the ability to read/comprehend the details.

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Re: Typically during thunderstorms most lightning strikes carry a negative   [#permalink] 10 Nov 2017, 03:58
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