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# Upwards of a billion stars in our galaxy have burnt up their internal

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Re: Upwards of a billion stars in our galaxy have burnt up their internal [#permalink]
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The author's primary purpose in the passage is to

(A) describe the formation and nature of singularities. Correct -Author starts by explaining singularity, brings in others more stable stars such as sun and ends by explaining limitations .
(B) explain why large numbers of stars become singularities. Incorrect- Passage does not tell why and also it’s not the main point.
(C) compare the characteristics of singularities with those of stars. Incorrect -No comparison is made of characteristics .
(0) explain what happens during the stages of a singularity's formation. Incorrect- Nothing is discussed regarding stages of singularity formation.
(E) imply that singularities could be more easily studied if observers could get closer to them. Incorrect- discussed, but not the main point .

The passage suggests which of the following about the Sun?

I. The Sun could evolve to a stage of collapse that is less dense than a singularity. Correct -
Refer These stars, of more than a few solar masses, evolve, in general, much more rapidly than does a star like the Sun. Moreover, it is just these more massive stars whose collapse does not halt at intermediate stages

II. In the Sun, the inward force of gravity is balanced by the generation of heat. Correct. Refer- singularity stars "can no longer produce the heat a star needs to oppose the inward force of gravity."
III. The Sun emits more observable light than does a white dwarf or a neutron star. Incorrect. Not as per passage .

(A) I only
(B) III only

(C) I and II only
(D) II and III only
(E) I, II, and III

Which of the following sentences would most probably follow the last sentence of the passage

(A) Thus, a physicist interested in studying phenomena near singularities would necessarily hope to find a singularity with a measurable gravitational field.
Measuring gravitational field is not discussed earlier -Eliminate
(B) Accordingly, physicists to date have been unable to observe directly any singularity. Correct. Author has intended to reflect this .
(C) It is specifically this startling phenomenon that has allowed us to codify the scant information currently available about singularities. Incorrect. no such stage is discussed- Eliminate.
(D) Moreover, the existence of this extraordinary phenomenon is implied in the extensive reports of several physicists. Eliminate- not as per passage.
(E) Although unanticipated, phenomena such as these are consistent with the structure of a singularity. Eliminate-not as per passage.
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Upwards of a billion stars in our galaxy have burnt up their internal [#permalink]
In Q3, how come B is right as in passage, it is give that " Unfortunately in most cases a distant observer cannot see the singularity"

Originally posted by jim441 on 27 Oct 2022, 07:32.
Last edited by jim441 on 27 Oct 2022, 08:33, edited 1 time in total.
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Re: Upwards of a billion stars in our galaxy have burnt up their internal [#permalink]
jim441 wrote:
In Q3, how come C is right as in passage, it is give that " Unfortunately in most cases a distant observer cannot see the singularity"

hi jim441,

The correct answer given is option B.
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Re: Upwards of a billion stars in our galaxy have burnt up their internal [#permalink]
jjanani222 wrote:
jim441 wrote:
In Q3, how come C is right as in passage, it is give that " Unfortunately in most cases a distant observer cannot see the singularity"

hi jim441,

The correct answer given is option B.

Yeah, I meant B. Doesn't make any sense
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Re: Upwards of a billion stars in our galaxy have burnt up their internal [#permalink]
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jim441 wrote:
In Q3, how come B is right

The end of the passage says...
It would be wonderful to observe a singularity...
Unfortunately in most cases a distant observer cannot see the singularity; [reasons why not]
.

This part is phrased as a hypothetical—implying that nobody has yet been able to do the thing described (= observe a singularity).
Just this statement alone is all you really need to answer this question correctly, but the following sentence sets up choice C even better by telling us, in detail, exactly why nobody has been able to see a singularity yet.

Given these two statements, the only logical follow-up is "...so, that's why we're still waiting to see one".
Re: Upwards of a billion stars in our galaxy have burnt up their internal [#permalink]
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