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

It is currently 19 Aug 2018, 14:14

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

Cloud seeding can aid precipitation in three ways. Static mode seed

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

Hide Tags

Director
Director
User avatar
V
Status: Preparing for GMAT
Joined: 25 Nov 2015
Posts: 749
Location: India
GPA: 3.64
GMAT ToolKit User Premium Member Reviews Badge
Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post Updated on: 29 Jul 2018, 09:06
Question 1
00:00
A
B
C
D
E

Question Stats:

27% (03:12) correct 73% (04:01) wrong based on 37

HideShow timer Statistics

Question 2
00:00
A
B
C
D
E

Question Stats:

51% (00:47) correct 49% (01:01) wrong based on 39

HideShow timer Statistics

Question 3
00:00
A
B
C
D
E

Question Stats:

68% (01:06) correct 33% (01:36) wrong based on 40

HideShow timer Statistics

Question 4
00:00
A
B
C
D
E

Question Stats:

84% (00:32) correct 16% (00:32) wrong based on 38

HideShow timer Statistics

Question 5
00:00
A
B
C
D
E

Question Stats:

59% (01:01) correct 41% (01:01) wrong based on 34

HideShow timer Statistics

Cloud seeding can aid precipitation in three ways. Static mode seeding adds silver iodide or dry ice crystals to cold clouds, causing supercooled liquid water droplets to freeze. The ice embryos that are formed can, if conditions are favorable, grow into snowflakes that fall to the ground as either snow or rain, depending on surface temperatures. (Cold cloud seeding can actually take place in warm weather, since the upper portions of cumulus clouds are cold enough for the supercooling to take place.) In dynamic seeding, a larger number of crystals are added. The resulting freezing releases heat, thereby increasing the size and longevity of the cloud. In the third method, hygroscopic seeding, clouds are seeded with salt crystals by airplanes from above, or artillery or rockets from below. These crystals introduce condensation nuclei that can increase the formation of water droplets within the cloud. This type of seeding can be effective in continental clouds, but not maritime clouds.

Concern has been expressed that seeding will “steal” rain from surrounding areas. However, seeding does not produce enough precipitation for this to be a significant factor. There is also evidence that when cumuliform clouds are present, the atmosphere continually replenishes its moisture, and that seeding can even increase precipitation in areas surrounding the target area.

The real concern is simply that seeding has not yet been shown to be effective. Cloud seeding depends on the existence of clouds, and even when they are present, some clouds cannot be seeded. Furthermore, even the proper type of cloud is only useful early in its formation, perhaps for just a few minutes. If the timing is off, the cloud can be destroyed by the process. Even if the seeding is successful, there is no guarantee that a change in the wind won’t cause rain to fall in an unintended region. Furthermore, testing for effectiveness is difficult and expensive. The normal controls of scientific experimentation are problematic when one can never know for sure whether an unseeded cloud would have produced rain.

Cloud seeding, if it ever proves to be dependably effective, will be a boon, not only to farmers, but also to hydroelectric power facilities, ski areas, and many other commercial and non-commercial interests. The difficulties of making this a reality are, however, substantial, and in some cases, insurmountable.
1) Which of the following most accurately mimics the process of cloud seeding, as it is described in the passage above?
A) Making snow at a ski area by pumping water through pipes into snow guns, so that snow pack is increased along trails.
B) Fertilizing fruit trees in an orchard, so that they produce more fruit and do so more reliably.
C) Raising interest rates in a country, so that growth and inflation slow down to a sustainable rate.
D) Creating underwater aquaculture farms, so that mussels and oysters can flourish in places they would not naturally.
E) Constructing desalination plants, so that unusable salt water can be transformed into usable fresh water.


2) Which of the following would the author most likely regard as an accurate description of the prospects for successful cloud seeding?
A) Moderately encouraging
B) Vastly underrated
C) Inherently limited
D) Virtually non-existent
E) Impossible to gauge



3) In cloud seeding, which one of the following is mentioned as a factor in determining the form of precipitation that hits the ground?
A) The temperature in the upper portions of the clouds that are seeded
B) Whether silver iodide or dry ice crystals are used to seed the clouds
C) The number of crystals that are added to the clouds
D) The temperature at the surface below the cloud seeding
E) The type of cloud that is seeded



4) The author of the passage is primarily concerned with
A) providing an overview of the mechanics and difficulties of cloud seeding
B) arguing for a more realistic approach to cloud seeding
C) giving a brief history of cloud seeding
D) comparing the methods used to seed clouds
E) acknowledging that cloud seeding is unlikely to be very useful in the future



5) According to the passage, cloud seeding can increase the size of a cloud by
A) creating water droplets through the introduction of condensation nuclei.
B) causing supercooling to take place in the upper portion of cumulus clouds.
C) carefully targeting continental clouds at the right stage in their development.
D) using a larger number of ice crystals than is used in static mode seeding.
E) using salt crystals to release heat that expands cloud particles.



_________________

Please give kudos, if you like my post

When the going gets tough, the tough gets going...


Originally posted by souvonik2k on 29 Jul 2018, 08:58.
Last edited by souvonik2k on 29 Jul 2018, 09:06, edited 1 time in total.
Most Helpful Community Reply
Director
Director
User avatar
V
Status: Preparing for GMAT
Joined: 25 Nov 2015
Posts: 749
Location: India
GPA: 3.64
GMAT ToolKit User Premium Member Reviews Badge
Re: Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post 31 Jul 2018, 09:57
1
Official Explanation From Veritas Prep

1) Which of the following most accurately mimics the process of cloud seeding, as it is described in the passage above?
A) Making snow at a ski area by pumping water through pipes into snow guns, so that snow pack is increased along trails.
B) Fertilizing fruit trees in an orchard, so that they produce more fruit and do so more reliably.
C) Raising interest rates in a country, so that growth and inflation slow down to a sustainable rate.
D) Creating underwater aquaculture farms, so that mussels and oysters can flourish in places they would not naturally.
E) Constructing desalination plants, so that unusable salt water can be transformed into usable fresh water.

Solution - For this type of “mimic the reasoning” question, you need to summarize the process of cloud seeding from your initial reading, and then look for the answer that best matches that summary. In the passage, you should note that cloud seeding is a way to stimulate a natural process: by adding an artificial element into naturally forming clouds, precipitation can be enhanced. So you should be looking for the answer that best describes the artificial enhancement of a natural process.

While (A) might seem correct (since it relates to creating precipitation), snowmaking is a completely artificial process. The correct answer must be enhancing an already natural process and (B) matches this perfectly. Fertilization, like cloud seeding, involves enhancing a natural process (in clouds, the production of rain, and in fruit trees, the production of fruit) so this is correct. While (C) does relate to artificial influence on a “natural” process – the economy – the correct answer must be enhancing the process, not limiting it. (D) might be tempting but says “so that they flourish in places they would NOT naturally.” Therefore this is not enhancing an already natural process. If cloud seeding involved creating the clouds themselves, then indeed this would be correct. For (E), since this answer relates to producing more water (the subject matter of cloud seeding), some might find it correct. However, it has nothing to do with enhancing an already natural process so it can be confidently eliminated. Remember that in “mimic the reasoning” questions, it is not the topic that needs to be mimicked, but rather the overall logic. Only (B) matches the process of cloud seeding and is thus correct.

2) Which of the following would the author most likely regard as an accurate description of the prospects for successful cloud seeding?
A) Moderately encouraging
B) Vastly underrated
C) Inherently limited
D) Virtually non-existent
E) Impossible to gauge

Solution - This passage is primarily explanatory/descriptive but there is some subjectivity at the end of the passage: the final sentence states that “The difficulties of making this a reality are, however, substantial, and in some cases, insurmountable.” Clearly not everyone would agree with that and the author has inserted some mild opinion to end the passage (although that is not the primary intent). You should always note any subjectivity in a reading comp passage, as questions are usually made to assess it.

Given that final sentence, you know the author has a mildly negative view about the prospects for effective cloud seeding, so you should find the answer that best matches that tone. For (A), nothing in the final paragraphs suggests the author is particularly encouraged about the prospects of effective seeding. For (B), the author is not suggesting that cloud seeding is somehow better than most people believe. For (D) and (E), both of these are far too strong and therefore easy to eliminate: the author seems to believe that successful seeding is possible but unlikely, and the author believes that the success of seeding is difficult to gauge, but not impossible.

Only (C) gets the author’s mild tone correct: the use of the word “insurmountable” in the passage implies inherent or built-in limitations and “limited” matches the mildly negative tone noted earlier. The correct answer is (C).

3) In cloud seeding, which one of the following is mentioned as a factor in determining the form of precipitation that hits the ground?
A) The temperature in the upper portions of the clouds that are seeded
B) Whether silver iodide or dry ice crystals are used to seed the clouds
C) The number of crystals that are added to the clouds
D) The temperature at the surface below the cloud seeding
E) The type of cloud that is seeded

Solution - For this type of “specific” question, you need to go find where the unique keywords given in the question stem (in this case “form of precipitation that hits the ground are discussed.” Since the details of cloud seeding are mentioned mainly in the 1st paragraph, you should focus your attention there. The correct answer will be stated explicitly, albeit with different (and sometimes tricky) wording, or it might just be well hidden.

In the first paragraph you find: “The ice embryos that are formed can, if conditions are favorable, grow into snowflakes that fall to the ground as either snow or rain, depending on surface temperatures.“ From this you can conclude definitively that (D) is correct: the surface temperature definitely affects whether the precipitation is snow or rain. If you find that quickly and match it to (D), this problem is relatively straightforward. However, some of the other answers seem to be correct also, and only a close reading can eliminate them.

For (A), it would seem that the temperature in the upper portion of the clouds would be important, but it does not matter for what hits the ground. The passage only states that the temperature in the upper portion of the clouds allows cold cloud seeding in warmer weather, but says nothing about how this will affect the form of precipitation at ground level. For (B), there is no mention of any important difference at all between those two types of seedings, yet alone in relation to the form of precipitation. (C) is tricky as you learn in the passage that “ [when] a larger number of crystals are added…the resulting freezing releases heat, thereby increasing the size and longevity of the cloud.” So the number of crystals affects the cloud formation, but that still tells you nothing about the form of precipitation that will hit the ground. Lastly for (E), nothing is given in the passage that relates the type of cloud to the type of precipitation that hits the ground, so this too can be eliminated. Only (D) is explicitly stated in the passage and is thus correct.

4) The author of the passage is primarily concerned with
A) providing an overview of the mechanics and difficulties of cloud seeding
B) arguing for a more realistic approach to cloud seeding
C) giving a brief history of cloud seeding
D) comparing the methods used to seed clouds
E) acknowledging that cloud seeding is unlikely to be very useful in the future

Solution - For any primary purpose question, the correct answer needs to match the type of passage (opinionated or explanatory/descriptive) and the scope of the passage. You must also make sure that the correct answer is exactly “on-topic” to the content of the passage.

In this example, the passage is almost exclusively explanatory/descriptive, although there is some mild subjectivity in the last paragraph. The first two paragraphs provide the overview of the mechanics of cloud seeding (including a few challenges), while the rest of the passage focuses more on the challenges.

Given this, you can first eliminate answer choice (B), as the primary purpose is to convey information, not “argue” anything. Also, the word “acknowledging” in (E) suggests it should be a more opinionated passage overall, and this answer is far too narrow in scope - the difficulties are just one part of the passage and the passage exists more to describe those difficulties than to acknowledge them.

Answer choice (C) is decidedly off topic, as no history is given within the passage. For (D), the first two paragraphs mainly describe the three different types of seeding and the comparisons made between them are minimal. Even with some comparisons made in the passage, this answer is far too narrow in scope and does not capture the overall purpose.

Only (A) gets everything correct – “providing” matches the type of passage perfectly and “the mechanics and difficulties of cloud seeding” is exactly on scope and on topic. The correct answer is (A).

5) According to the passage, cloud seeding can increase the size of a cloud by
A) creating water droplets through the introduction of condensation nuclei.
B) causing supercooling to take place in the upper portion of cumulus clouds.
C) carefully targeting continental clouds at the right stage in their development.
D) using a larger number of ice crystals than is used in static mode seeding.
E) using salt crystals to release heat that expands cloud particles.

Solution - For this type of “specific” question, you need to go find where the unique keywords given in the question stem (in this case “cloud seeding can increase the size of a cloud”) are discussed. Since the details of cloud seeding are mentioned mainly in the 1st paragraph, you should focus your attention there. The correct answer will be stated explicitly, albeit with different (and sometimes tricky) wording, or it might be well hidden, as in this problem.

With so much specificity in the question stem, you should first find exactly where an increase in the size of clouds is discussed. In the 1st paragraph, after a discussion of static mode seeding, the author states that: “In dynamic seeding, a larger number of crystals are added. The resulting freezing can release heat, thereby increasing the size and longevity of the cloud.”

Given this section, you should see that (D) is correct: “a larger number of crystals [than in static seeding]” results in an increase in cloud size. For (A), “condensation nuclei” was only discussed regarding hygroscopic seeding (the third method) and there is no discussion of an increase in cloud size there. Similarly for (B), supercooling is only discussed in relation to cold cloud seeding (the first method) and no relation to an increase in cloud size is given. For (C), there is no link given in the passage between the timing of seeding or the type of cloud and an increase in the size of clouds. For (E), salt crystals were only discussed in relation to hygroscopic seeding (the third method) and as with (A), there is no discussion in the passage of whether this increases cloud size. The correct answer is (D).
_________________

Please give kudos, if you like my post

When the going gets tough, the tough gets going...

General Discussion
RC Moderator
User avatar
G
Status: Perfecting myself for GMAT
Joined: 22 May 2017
Posts: 440
Concentration: Nonprofit
Schools: Haas '21
GPA: 4
WE: Engineering (Computer Software)
GMAT ToolKit User Premium Member CAT Tests
Re: Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post 29 Jul 2018, 09:04
2
souvonik2k

Please format the passage according to rules mentioned here https://gmatclub.com/forum/rc-forum-rul ... 55874.html

Thank you.
_________________

If you like my post press kudos +1

New - RC Butler - 2 RC's everyday

Tag me in RC questions if you need help. Please provide your analysis of the question in the post along with the tag.

Manager
Manager
User avatar
B
Joined: 11 Aug 2016
Posts: 68
Reviews Badge CAT Tests
Re: Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post 31 Jul 2018, 04:30
souvonik2k wrote:
1) Which of the following most accurately mimics the process of cloud seeding, as it is described in the passage above?
A) Making snow at a ski area by pumping water through pipes into snow guns, so that snow pack is increased along trails.
B) Fertilizing fruit trees in an orchard, so that they produce more fruit and do so more reliably.
C) Raising interest rates in a country, so that growth and inflation slow down to a sustainable rate.
D) Creating underwater aquaculture farms, so that mussels and oysters can flourish in places they would not naturally.
E) Constructing desalination plants, so that unusable salt water can be transformed into usable fresh water.




Can you please post the OE for Question 1.
Also it would be great if someone could guide me develop approach to such Mimic the Reasoning questions.
Thanks !
_________________

-- --
R.
If my post was of any help to you, You can thank me in the form of Kudos!!

Manager
Manager
User avatar
B
Joined: 11 Aug 2016
Posts: 68
Reviews Badge CAT Tests
Re: Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post 31 Jul 2018, 04:38
souvonik2k wrote:
Cloud seeding can aid precipitation in three ways. Static mode seeding adds silver iodide or dry ice crystals to cold clouds, causing supercooled liquid water droplets to freeze. The ice embryos that are formed can, if conditions are favorable, grow into snowflakes that fall to the ground as either snow or rain, depending on surface temperatures. (Cold cloud seeding can actually take place in warm weather, since the upper portions of cumulus clouds are cold enough for the supercooling to take place.) In dynamic seeding, a larger number of crystals are added. The resulting freezing releases heat, thereby increasing the size and longevity of the cloud. In the third method, hygroscopic seeding, clouds are seeded with salt crystals by airplanes from above, or artillery or rockets from below. These crystals introduce condensation nuclei that can increase the formation of water droplets within the cloud. This type of seeding can be effective in continental clouds, but not maritime clouds.

Concern has been expressed that seeding will “steal” rain from surrounding areas. However, seeding does not produce enough precipitation for this to be a significant factor. There is also evidence that when cumuliform clouds are present, the atmosphere continually replenishes its moisture, and that seeding can even increase precipitation in areas surrounding the target area.

The real concern is simply that seeding has not yet been shown to be effective. Cloud seeding depends on the existence of clouds, and even when they are present, some clouds cannot be seeded. Furthermore, even the proper type of cloud is only useful early in its formation, perhaps for just a few minutes. If the timing is off, the cloud can be destroyed by the process. Even if the seeding is successful, there is no guarantee that a change in the wind won’t cause rain to fall in an unintended region. Furthermore, testing for effectiveness is difficult and expensive. The normal controls of scientific experimentation are problematic when one can never know for sure whether an unseeded cloud would have produced rain.

Cloud seeding, if it ever proves to be dependably effective, will be a boon, not only to farmers, but also to hydroelectric power facilities, ski areas, and many other commercial and non-commercial interests. The difficulties of making this a reality are, however, substantial, and in some cases, insurmountable.
5) According to the passage, cloud seeding can increase the size of a cloud by
A) creating water droplets through the introduction of condensation nuclei.
B) causing supercooling to take place in the upper portion of cumulus clouds.
C) carefully targeting continental clouds at the right stage in their development.
D) using a larger number of ice crystals than is used in static mode seeding.
E) using salt crystals to release heat that expands cloud particles.




Need help understanding Why D is the Correct Answer and not C.
The Question asks: "According to the passage, cloud seeding can increase the size of a cloud by"
IMO both C and D are potential candidates, but, since nothing is mentioned about the results of increasing the number of ice crystals and it is mentioned that targeting continental clouds at the right stage in their development merely increases the chances of successful seeding. See the part in RED.
_________________

-- --
R.
If my post was of any help to you, You can thank me in the form of Kudos!!

Director
Director
User avatar
V
Status: Preparing for GMAT
Joined: 25 Nov 2015
Posts: 749
Location: India
GPA: 3.64
GMAT ToolKit User Premium Member Reviews Badge
Re: Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post 31 Jul 2018, 05:05
1
Rumanshu1990 wrote:
souvonik2k wrote:
Cloud seeding can aid precipitation in three ways. Static mode seeding adds silver iodide or dry ice crystals to cold clouds, causing supercooled liquid water droplets to freeze. The ice embryos that are formed can, if conditions are favorable, grow into snowflakes that fall to the ground as either snow or rain, depending on surface temperatures. (Cold cloud seeding can actually take place in warm weather, since the upper portions of cumulus clouds are cold enough for the supercooling to take place.)In dynamic seeding, a larger number of crystals are added. The resulting freezing releases heat, thereby increasing the size and longevity of the cloud. In the third method, hygroscopic seeding, clouds are seeded with salt crystals by airplanes from above, or artillery or rockets from below. These crystals introduce condensation nuclei that can increase the formation of water droplets within the cloud. This type of seeding can be effective in continental clouds, but not maritime clouds.

Concern has been expressed that seeding will “steal” rain from surrounding areas. However, seeding does not produce enough precipitation for this to be a significant factor. There is also evidence that when cumuliform clouds are present, the atmosphere continually replenishes its moisture, and that seeding can even increase precipitation in areas surrounding the target area.

The real concern is simply that seeding has not yet been shown to be effective. Cloud seeding depends on the existence of clouds, and even when they are present, some clouds cannot be seeded. Furthermore, even the proper type of cloud is only useful early in its formation, perhaps for just a few minutes. If the timing is off, the cloud can be destroyed by the process. Even if the seeding is successful, there is no guarantee that a change in the wind won’t cause rain to fall in an unintended region. Furthermore, testing for effectiveness is difficult and expensive. The normal controls of scientific experimentation are problematic when one can never know for sure whether an unseeded cloud would have produced rain.

Cloud seeding, if it ever proves to be dependably effective, will be a boon, not only to farmers, but also to hydroelectric power facilities, ski areas, and many other commercial and non-commercial interests. The difficulties of making this a reality are, however, substantial, and in some cases, insurmountable.
5) According to the passage, cloud seeding can increase the size of a cloud by
A) creating water droplets through the introduction of condensation nuclei.
B) causing supercooling to take place in the upper portion of cumulus clouds.
C) carefully targeting continental clouds at the right stage in their development.
D) using a larger number of ice crystals than is used in static mode seeding.
E) using salt crystals to release heat that expands cloud particles.




Need help understanding Why D is the Correct Answer and not C.
The Question asks: "According to the passage, cloud seeding can increase the size of a cloud by"
IMO both C and D are potential candidates, but, since nothing is mentioned about the results of increasing the number of ice crystals and it is mentioned that targeting continental clouds at the right stage in their development merely increases the chances of successful seeding. See the part in RED.


Hi
Please refer the highlighted portion in the passage. According to the question - cloud seeding can increase the size of a cloud by --choice D mentions the part highlighted in the passage.
Hope it is clear.
_________________

Please give kudos, if you like my post

When the going gets tough, the tough gets going...

Intern
Intern
avatar
B
Joined: 07 Mar 2012
Posts: 5
GMAT 1: 630 Q49 V24
GMAT 2: 650 Q46 V36
Re: Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post 31 Jul 2018, 05:07
Rumanshu1990 wrote:
souvonik2k wrote:
1) Which of the following most accurately mimics the process of cloud seeding, as it is described in the passage above?
A) Making snow at a ski area by pumping water through pipes into snow guns, so that snow pack is increased along trails.
B) Fertilizing fruit trees in an orchard, so that they produce more fruit and do so more reliably.
C) Raising interest rates in a country, so that growth and inflation slow down to a sustainable rate.
D) Creating underwater aquaculture farms, so that mussels and oysters can flourish in places they would not naturally.
E) Constructing desalination plants, so that unusable salt water can be transformed into usable fresh water.




Can you please post the OE for Question 1.
Also it would be great if someone could guide me develop approach to such Mimic the Reasoning questions.
Thanks !



We need to understand what essentially is getting achieved by the process of cloud seeding. The first line says - Cloud seeding can aid precipitation...It means precipitation is supposed to happen anyway. Cloud seeding is just aiding the process possibly for more precipitation or for controlling when it's occurrence. This reflects correctly in "Fertilizing fruit trees in an orchard, so that they produce more fruit and do so more reliably." . Other options are not examples of aiding but are examples of main cause.
Manager
Manager
User avatar
B
Joined: 11 Aug 2016
Posts: 68
Reviews Badge CAT Tests
Re: Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post 31 Jul 2018, 05:13
souvonik2k wrote:
Rumanshu1990 wrote:
souvonik2k wrote:
Cloud seeding can aid precipitation in three ways. Static mode seeding adds silver iodide or dry ice crystals to cold clouds, causing supercooled liquid water droplets to freeze. The ice embryos that are formed can, if conditions are favorable, grow into snowflakes that fall to the ground as either snow or rain, depending on surface temperatures. (Cold cloud seeding can actually take place in warm weather, since the upper portions of cumulus clouds are cold enough for the supercooling to take place.)In dynamic seeding, a larger number of crystals are added. The resulting freezing releases heat, thereby increasing the size and longevity of the cloud. In the third method, hygroscopic seeding, clouds are seeded with salt crystals by airplanes from above, or artillery or rockets from below. These crystals introduce condensation nuclei that can increase the formation of water droplets within the cloud. This type of seeding can be effective in continental clouds, but not maritime clouds.

Concern has been expressed that seeding will “steal” rain from surrounding areas. However, seeding does not produce enough precipitation for this to be a significant factor. There is also evidence that when cumuliform clouds are present, the atmosphere continually replenishes its moisture, and that seeding can even increase precipitation in areas surrounding the target area.

The real concern is simply that seeding has not yet been shown to be effective. Cloud seeding depends on the existence of clouds, and even when they are present, some clouds cannot be seeded. Furthermore, even the proper type of cloud is only useful early in its formation, perhaps for just a few minutes. If the timing is off, the cloud can be destroyed by the process. Even if the seeding is successful, there is no guarantee that a change in the wind won’t cause rain to fall in an unintended region. Furthermore, testing for effectiveness is difficult and expensive. The normal controls of scientific experimentation are problematic when one can never know for sure whether an unseeded cloud would have produced rain.

Cloud seeding, if it ever proves to be dependably effective, will be a boon, not only to farmers, but also to hydroelectric power facilities, ski areas, and many other commercial and non-commercial interests. The difficulties of making this a reality are, however, substantial, and in some cases, insurmountable.
5) According to the passage, cloud seeding can increase the size of a cloud by
A) creating water droplets through the introduction of condensation nuclei.
B) causing supercooling to take place in the upper portion of cumulus clouds.
C) carefully targeting continental clouds at the right stage in their development.
D) using a larger number of ice crystals than is used in static mode seeding.
E) using salt crystals to release heat that expands cloud particles.




Need help understanding Why D is the Correct Answer and not C.
The Question asks: "According to the passage, cloud seeding can increase the size of a cloud by"
IMO both C and D are potential candidates, but, since nothing is mentioned about the results of increasing the number of ice crystals and it is mentioned that targeting continental clouds at the right stage in their development merely increases the chances of successful seeding. See the part in RED.


Hi
Please refer the highlighted portion in the passage. According to the question - cloud seeding can increase the size of a cloud by --choice D mentions the part highlighted in the passage.
Hope it is clear.


Hi Suvonik !
I guess I missed that part. I thought that the crystals referred to the static mode seeding.
Thanks for pointing out ! :thumbup:
_________________

-- --
R.
If my post was of any help to you, You can thank me in the form of Kudos!!

Manager
Manager
User avatar
B
Joined: 11 Aug 2016
Posts: 68
Reviews Badge CAT Tests
Re: Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post 31 Jul 2018, 05:16
ssoGMAT wrote:
Rumanshu1990 wrote:
souvonik2k wrote:
1) Which of the following most accurately mimics the process of cloud seeding, as it is described in the passage above?
A) Making snow at a ski area by pumping water through pipes into snow guns, so that snow pack is increased along trails.
B) Fertilizing fruit trees in an orchard, so that they produce more fruit and do so more reliably.
C) Raising interest rates in a country, so that growth and inflation slow down to a sustainable rate.
D) Creating underwater aquaculture farms, so that mussels and oysters can flourish in places they would not naturally.
E) Constructing desalination plants, so that unusable salt water can be transformed into usable fresh water.




Can you please post the OE for Question 1.
Also it would be great if someone could guide me develop approach to such Mimic the Reasoning questions.
Thanks !



We need to understand what essentially is getting achieved by the process of cloud seeding. The first line says - Cloud seeding can aid precipitation...It means precipitation is supposed to happen anyway. Cloud seeding is just aiding the process possibly for more precipitation or for controlling when it's occurrence. This reflects correctly in "Fertilizing fruit trees in an orchard, so that they produce more fruit and do so more reliably." . Other options are not examples of aiding but are examples of main cause.


So basically reading more carefully is what will help me in such questions ?
I guess as the passages move up the difficulty ladder, the more reasoning would be consolidated to a specific hidden keyword(such as this one, though not hidden)
_________________

-- --
R.
If my post was of any help to you, You can thank me in the form of Kudos!!

Intern
Intern
avatar
B
Joined: 07 Mar 2012
Posts: 5
GMAT 1: 630 Q49 V24
GMAT 2: 650 Q46 V36
Re: Cloud seeding can aid precipitation in three ways. Static mode seed  [#permalink]

Show Tags

New post 31 Jul 2018, 05:43
1
We need to understand what essentially is getting achieved by the process of cloud seeding. The first line says - Cloud seeding can aid precipitation...It means precipitation is supposed to happen anyway. Cloud seeding is just aiding the process possibly for more precipitation or for controlling when it's occurrence. This reflects correctly in "Fertilizing fruit trees in an orchard, so that they produce more fruit and do so more reliably." . Other options are not examples of aiding but are examples of main cause.[/quote]

So basically reading more carefully is what will help me in such questions ?
I guess as the passages move up the difficulty ladder, the more reasoning would be consolidated to a specific hidden keyword(such as this one, though not hidden)[/quote]

Your steps should be -
Step 1: Identify that it is an application question.
Step 2: Identify the "high level" action out of provided examples.
Step 3: Find Odd man out in answer choices.

We should know what we are looking for in the answer choices.
Re: Cloud seeding can aid precipitation in three ways. Static mode seed &nbs [#permalink] 31 Jul 2018, 05:43
Display posts from previous: Sort by

Cloud seeding can aid precipitation in three ways. Static mode seed

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

Events & Promotions

PREV
NEXT


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®.