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

Question

Upwards of a billion stars in our galaxy have burnt up their internal energy sources, and so can no longer produce the heat a star needs to oppose the inward force of gravity. 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 (that is, as white dwarfs or neutron stars). Instead, the collapse continues until a singularity (an infinitely dense concentration of matter) is reached . It would be wonderful to observe a singularity and obtain direct evidence of the undoubtedly bizarre phenomena that occur near one. Unfortunately in most cases a distant observer cannot see the singularity; outgoing light rays are dragged back by gravity so forcefully that even if they could start out within a few kilometers of the singularity, they would end up in the singularity itself.    1 
 A 
  The author's primary purpose in the passage is to

(A) describe the formation and nature of singularities
(B) explain why large numbers of stars become singularities
(C) compare the characteristics of singularities with those of stars
(0) explain what happens during the stages of a singularity's formation
(E) imply that singularities could be more easily studied if observers could get closer to them

2 
 C 
 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.
II. In the Sun, the inward force of gravity is balanced by the generation of heat.
III. The Sun emits more observable light than does a white dwarf or a neutron star.

(A) I only
(B) III only
(C) I and II only
(0) II and III only
(E) I, II, and III

3 
 B 
 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.
(B) Accordingly, physicists to date have been unable to observe directly any singularity.
(C) It is specifically this startling phenomenon that has allowed us to codify the scant information currently available about singularities.
(D) Moreover, the existence of this extraordinary phenomenon is implied in the extensive reports of several physicists.
(E) Although unanticipated, phenomena such as these are consistent with the structure of a singularity.

RC Butler 2021  -  Practice Two RC Questions Everyday.   
Passage # 219 Date: 03-Jun-2021
 This question is a part of RC Butler 2021 .  Click here for Details

LaveenaPanchal · Accepted Answer

The author's primary purpose in the passage is to

(A) describe the formation and nature of singularities.  Correct The passage begins with explaining a type of stars and continues till end to explain about the singularities phenomena of the stars. 
(B) explain why large numbers of stars become singularities.  Incorrect While the passage explain the singularities but it does not provide its reasons. 
(C) compare the characteristics of singularities with those of stars.  Incorrect No comparison in singularities. 
(0) explain what happens during the stages of a singularity's formation.  Incorrect no such details on stages of singularity formation. 
(E) imply that singularities could be more easily studied if observers could get closer to them.  Incorrect This is intended only during the end of the passage.

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 this is suggested by the following line "Instead, the collapse continues until a singularity (an infinitely dense concentration of matter) is reached" Thus Sun could evolve to collapse at less dense stage than a singularity 
II. In the Sun, the inward force of gravity is balanced by the generation of heat.  Correct. It is suggested in the passage that 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. No such comparison given in the 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.  Incorrect it is mentioned in the passage that the Observation of a singularity would be wonderful but alongwith a measurable gravitational field is not intended. 
(B) Accordingly, physicists to date have been unable to observe directly any singularity.  Correct. It is implied in the passage and hence correct .
(C) It is specifically this startling phenomenon that has allowed us to codify the scant information currently available about singularities.  Incorrect. The phenomena mentioned in the end of the passage does not allow us to observe the singularity and does not help to codify the information about singularities. 
(D) Moreover, the existence of this extraordinary phenomenon is implied in the extensive reports of several physicists.  Incorrect No such inference can be made as per the information in the passage. 
(E) Although unanticipated, phenomena such as these are consistent with the structure of a singularity.  Incorrect This cannot be implied by the information in the passage.

GAngstA · Answer

third question asked us to find interference....

sumitkrocks · Answer

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.

jim441 · Answer

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"

jjanani222 · Answer

hi  jim441 ,

The correct answer given is option B.

jim441 · Answer

Yeah, I meant B. Doesn't make any sense

RonTargetTestPrep · Answer

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;   .

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".

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

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

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615 to 715 in 15 Days (Ria's Strategies)

More than Quant/Verbal Abilities: Speed vs. Accuracy

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