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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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explanation
Q1 - not going by options cause i feel the right way to approach such ques is nt by options but by thinking abt the purpose by yourself first

Purpose - To discuss and explain why The star has started reducing the frequency of flickering

Options that come close - B and D
D - wrong as the structure of psg has not been made in a way that an argument is being defended or an argument has been mentioned and then we are defending it
So ans - B

2 - straight from psg "This drop in amplitude suggests a cessation of the internal conditions that drive the pulsations will result in a disappearance of the pulsations."


3 - same as mentioned by Sajjad1994
- drop in amplitude is nt the pt , drop in frequency is the pt
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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please explain the 5th one
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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aryan3 wrote:
please explain the 5th one


One has to read the complete passage to answer this question, in the passage there is no concrete evidence or reason provided for the pulsations of Polaris or gradually slowing pulsations of Polaris. Different scenarios are provided in which the pulsation of Polaris is slowing down but not the main reason.

A. Water in a beaker contracts as it cools until it reaches a point just above freezing, after which it begins to expand, and continues to expand through its phase change into ice.

B. The echo off a canyon wall takes longer to return to a listener as the origin of the noise moves further away from the wall.

C. A tuning fork is struck, giving off a high-pitched tone, and the pitch gets lower as the vibration of the tines slows over time.

D. An unevenly weighted lump of clay begins to rotate in an eccentric manner as a potter's wheel increases its speed of revolution.

E. The earth's moon goes through a nightly cycle of becoming more visible until it is in its full phase, and then incrementally wanes until it is no longer visible.

Due to the text in Red in above incorrect options the answer choices are not a fit analogy. Only C is better one.

Answer: C
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
Can someone explain why Option C in question 4 is the right answer to an inference question, even though the passage explicitly states what is given in Option C. Additionally, wouldn't Option E be more accurate for the same question?
Bunuel CrackVerbal
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
can someone plz explain Q7
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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MalharPagay wrote:
Can someone explain why Option C in question 4 is the right answer to an inference question, even though the passage explicitly states what is given in Option C. Additionally, wouldn't Option E be more accurate for the same question?
Bunuel CrackVerbal


Hi MalharPagay

If you read the passage again you might come to know that E is a bit awkward and extreme to consider for the answer, the words "lengthy transition" make this option out of the scope of the passage. On the other hand, C is very straight forward and lies within the boundaries of the passage.

PS: Mostly test makers trap the test takers by using the information in the answer choice which is explicitly written in the passage but it is not the case at all the times. So if the answer option is containing information which can be explicitly validated by the passage the answer choice might not the trap in this case we make sure the answer by reading and comparing the remaining choices.

Thank you
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Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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Eakansh12 wrote:
can someone plz explain Q7


Explanation


7. The passage suggests that the pulsations of Polaris can be expected to

Difficulty Level: 500

Explanation

First, read the question then find the support of the answer in the passage, below is the text from the passage which to the answer:

The results of these studies also suggest that the four-day pulsation period is slowly lengthening, and establish that this decline is occurring gradually rather than by abrupt jumps, slowing as the star ages, cools, and expands.

Another here

This drop in amplitude suggests a cessation of the internal conditions that drive the pulsations will result in a disappearance of the pulsations.

The perfect lead here

it provides the most logical explanation of the decline in both the frequency and the amplitude of the star’s pulsations.

Now read the answer choices

A. continue to decline in both frequency and amplitude as the star becomes more stable

Correct! according to the above text taken from the passage

B. continue at the current rate of frequency and degree of amplitude indefinitely

Out of scope of the passage

C. build in frequency and drop in amplitude until the star reaches a stable state

Trap: Half right and half wrong answer choice

D. increase in both frequency and amplitude as the star leaves its unstable phase

This is at 180, totally opposite.

E. remain perceptible and stable for at least 40 QO0 years while internal forces cease

Same as the (B) Out of scope of the passage

Answer: A
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
question 2 please and why B not A.
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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Official Explanation


2. According to the passage, the pulsations of a Cepheid variable most probably cease

Difficulty Level: 700

Explanation

This is a retrieval question, as shown by the words according to the passage. The task of the question is indicated by the words according to the passage. The subject of the question is when the pulsations of a Cepheid variable most probably cease. In order to answer this question, determine what the passage says about the subject, then evaluate each answer choice, eliminating any choice that cannot be supported by the text. The passage says cessation of the internal conditions that drive the pulsations will result in a disappearance of the pulsations.

Choice A: No. This choice may be attractive because of the recycled phrase 40,000 years, but this choice is recycled language. The passage says Cepheids spend 40,000 years or more, which is quite different from no more than 40,000 years old.

Choice B: Correct. The passage says a cessation of the internal conditions that drive the pulsations will result in a disappearance of the pulsations.

Choice C: No. While this choice may seem appealing because the passage states that there is a transition, which lasts only a short time, this choice is a memory trap. The transition may last only a short time, but the pulsations disappear at the end of the transition, not its beginning.

Choice D: No. This choice is appealing, as the passage mentions pulsations slowing as the star ages, cools, and expands. However, this choice is a memory trap. The pulsations slow as the star cools and expands, but do not immediately cease.

Choice E: No. While this choice may seem attractive because the passage says that the four-day pulsation period is slowly lengthening. But this is a reversal since the pulsation period is not shortening but lengthening.

The correct answer is choice B.


GAngstA wrote:
question 2 please and why B not A.
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
Hello Sajjad1994! could you please provide the official explanation of question 6?. Furthermore, could you please provide the difficulty level of each question?. Thank you in advance for your help, your replay will be much appreciated.
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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JCGF2021 wrote:
Hello Sajjad1994! could you please provide the official explanation of question 6?. Furthermore, could you please provide the difficulty level of each question?. Thank you in advance for your help, your replay will be much appreciated.


Hello JCGF2021

OE is not available let me try it on my own.

Explanation


6. The passage suggests that all of the following are accurate statements about Polaris EXCEPT

Difficulty Level: 700

Explanation

The question asks us to find what cannot be inferred from the passage. Let's read each option.

A. Its distance from the earth has not been precisely established.

Can be inferred: "Classified as a Cepheid variable and about 500 to 800 light-years from Earth,"

B. Its pulsations are now longer than the four-day period previously recorded.

Can be inferred from the first paragraph.

C. It can be located in the Northern hemisphere of the night sky.

This one is tough to find or infer from the passage but the only text which suggests this is: "Polaris, the North Star," This is a weak inference though. An official question or a quality question must have a strong logical inference.

D. The amplitude of its pulsations has been declining for 40,000 years.

This cannot be inferred, the only seemingly related text in the passage is "Cepheids spend 40,000 years or more in an unstable, pulsating phase before reaching non-pulsing stability"

But it does not suggest that the amplitude of its pulsations has been declining for 40,000 years. This seems ok.

E. Its current transition status is a comparatively brief phase.

Yes, it is brief and given in the first paragraph.

Answer: D
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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JCGF2021 wrote:
Hello Sajjad1994! could you please provide the official explanation of question 6?. Furthermore, could you please provide the difficulty level of each question?. Thank you in advance for your help, your replay will be much appreciated.


The difficulty level should be the following in my opinion.

Question #1: 500
Question #2: 650-700
Question #3: 600
Question #4: 600
Question #5: 700
Question #6: 700
Question #7: 500

Overall: 600-650
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
Sajjad1994 wrote:
JCGF2021 wrote:
Hello Sajjad1994! could you please provide the official explanation of question 6?. Furthermore, could you please provide the difficulty level of each question?. Thank you in advance for your help, your replay will be much appreciated.


Hello JCGF2021

OE is not available let me try it on my own.

Explanation


6. The passage suggests that all of the following are accurate statements about Polaris EXCEPT

Difficulty Level: 700

Explanation

The question asks us to find what cannot be inferred from the passage. Let's read each option.

A. Its distance from the earth has not been precisely established.

Can be inferred: "Classified as a Cepheid variable and about 500 to 800 light-years from Earth,"

B. Its pulsations are now longer than the four-day period previously recorded.

Can be inferred from the first paragraph.

C. It can be located in the Northern hemisphere of the night sky.

This one is tough to find or infer from the passage but the only text which suggests this is: "Polaris, the North Star," This is a weak inference though. An official question or a quality question must have a strong logical inference.

D. The amplitude of its pulsations has been declining for 40,000 years.

This cannot be inferred, the only seemingly related text in the passage is "Cepheids spend 40,000 years or more in an unstable, pulsating phase before reaching non-pulsing stability"

But it does not suggest that the amplitude of its pulsations has been declining for 40,000 years. This seems ok.

E. Its current transition status is a comparatively brief phase.

Yes, it is brief and given in the first paragraph.

Answer: D


Hi Sajjad,

If in Question 6 we cannot infer from the passage that the amplitude of pulsation is declining for 40000 years then, how is Answer to Question 7 says exactly the same thing - that both frequency and amplitude decreases gradually. Is it not actually the anti-thesis of the same, kind of paradox if you will.

Please explain this.

Regards,
Mayukh
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
Expert Reply
Mayukhca2018 wrote:
Sajjad1994 wrote:
JCGF2021 wrote:
Hello Sajjad1994! could you please provide the official explanation of question 6?. Furthermore, could you please provide the difficulty level of each question?. Thank you in advance for your help, your replay will be much appreciated.


Hello JCGF2021

OE is not available let me try it on my own.

Explanation


6. The passage suggests that all of the following are accurate statements about Polaris EXCEPT

Difficulty Level: 700

Explanation

The question asks us to find what cannot be inferred from the passage. Let's read each option.

A. Its distance from the earth has not been precisely established.

Can be inferred: "Classified as a Cepheid variable and about 500 to 800 light-years from Earth,"

B. Its pulsations are now longer than the four-day period previously recorded.

Can be inferred from the first paragraph.

C. It can be located in the Northern hemisphere of the night sky.

This one is tough to find or infer from the passage but the only text which suggests this is: "Polaris, the North Star," This is a weak inference though. An official question or a quality question must have a strong logical inference.

D. The amplitude of its pulsations has been declining for 40,000 years.

This cannot be inferred, the only seemingly related text in the passage is "Cepheids spend 40,000 years or more in an unstable, pulsating phase before reaching non-pulsing stability"

But it does not suggest that the amplitude of its pulsations has been declining for 40,000 years. This seems ok.

E. Its current transition status is a comparatively brief phase.

Yes, it is brief and given in the first paragraph.

Answer: D


Hi Sajjad,

If in Question 6 we cannot infer from the passage that the amplitude of pulsation is declining for 40000 years then, how is Answer to Question 7 says exactly the same thing - that both frequency and amplitude decreases gradually. Is it not actually the anti-thesis of the same, kind of paradox if you will.

Please explain this.

Regards,
Mayukh


Answer to question #6 is:

D. The amplitude of its pulsations has been declining for 40,000 years.

Ans answer to question #7 is:

A. continue to decline in both frequency and amplitude as the star becomes more stable

Declining for 40,000 years and continue to decline are two different scenarios. Both statements are not exact but rather different.
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Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
Sajjad1994 wrote:
Mayukhca2018 wrote:
Sajjad1994 wrote:
Hello Sajjad1994! could you please provide the official explanation of question 6?. Furthermore, could you please provide the difficulty level of each question?. Thank you in advance for your help, your replay will be much appreciated.


Hello JCGF2021

OE is not available let me try it on my own.

Explanation


6. The passage suggests that all of the following are accurate statements about Polaris EXCEPT

Difficulty Level: 700

Explanation

The question asks us to find what cannot be inferred from the passage. Let's read each option.

A. Its distance from the earth has not been precisely established.

Can be inferred: "Classified as a Cepheid variable and about 500 to 800 light-years from Earth,"

B. Its pulsations are now longer than the four-day period previously recorded.

Can be inferred from the first paragraph.

C. It can be located in the Northern hemisphere of the night sky.

This one is tough to find or infer from the passage but the only text which suggests this is: "Polaris, the North Star," This is a weak inference though. An official question or a quality question must have a strong logical inference.

D. The amplitude of its pulsations has been declining for 40,000 years.

This cannot be inferred, the only seemingly related text in the passage is "Cepheids spend 40,000 years or more in an unstable, pulsating phase before reaching non-pulsing stability"

But it does not suggest that the amplitude of its pulsations has been declining for 40,000 years. This seems ok.

E. Its current transition status is a comparatively brief phase.

Yes, it is brief and given in the first paragraph.

Answer: D


Hi Sajjad,

If in Question 6 we cannot infer from the passage that the amplitude of pulsation is declining for 40000 years then, how is Answer to Question 7 says exactly the same thing - that both frequency and amplitude decreases gradually. Is it not actually the anti-thesis of the same, kind of paradox if you will.

Please explain this.

Regards,
Mayukh


Answer to question #6 is:

D. The amplitude of its pulsations has been declining for 40,000 years.

Ans answer to question #7 is:

A. continue to decline in both frequency and amplitude as the star becomes more stable

Declining for 40,000 years and continue to decline are two different scenarios. Both statements are not exact but rather different.[/quote]

Sajjad1994
According to answer stem from question 6, we could infer that the the amplitude of pulsation is not declining since 40 years while answer stem 7 says that both frequency and amplitude would decline as the star becomes stable. This is somewhat counter intuitive.
Also, I am not able to understand why is option D in accurate for Polaris, when we know that drop in pulsation is linked with lowering of the amplitude of brightness.
Also, how do we infer that the transition time is brief(understood as long)
Thanks in Advance
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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jim441 wrote:
Can you please clarify the answer of Q6. i am unable to uunderstand why the answer is D rather than E!


Read the explanation in the post in the link below

https://gmatclub.com/forum/classified-a ... l#p3010343

Best.
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Re: Classified as a Cepheid variable and about 500 to 800 light-years from [#permalink]
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