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After evidence was obtained in the 1920s that the universe

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Joined: 26 Sep 2012
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Re: After evidence was obtained in the 1920s that the universe [#permalink] New post 26 Aug 2013, 10:41
9 mins, 3 correct. please explain q116 and q117.
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After evidence was obtained in the 1920s that the universe [#permalink] New post 28 Aug 2014, 11:47
This can be done within 10 mins. I goofed up in 117 but then realized my mistake. 116 is tricky :)
115. The passage is primarily concerned with
(A) defending a controversial approach
(B) criticizing an accepted view
(C) summarizing research findings
>>
P1: Problem is introduced.
P2: A Research is introduced in this regard.
P3: Closes the discussion with a final note on the research.
So overall its summarizing the research.

(D) contrasting competing theories
(E) describing an innovative technique

116. The authors’ study indicates that, in comparison with the outermost regions of a typical spiral galaxy, the region just outside the nucleus can be characterized as having
(A) higher rotational velocity and higher luminosity
(B) lower rotational velocity and higher luminosity
(C) lower rotational velocity and lower luminosity
(D) similar rotational velocity and higher luminosity
>> Instead we have found that the rotational velocity in spiral galaxies either remains constant with increasing distance from the center or increases slightly.

(E) similar rotational velocity and similar luminosity

117. The authors’ suggestion that “as much as 90 percent of the mass of the universe is not radiating at any wavelength with enough intensity to be detected on the Earth” (lines 34–37) would be most weakened if which of the following were discovered to be true?
(A) Spiral galaxies are less common than types of galaxies that contain little nonluminous matter.
>> Author concludes that its the low intensity wavelength of NLM because of which it cant be detected on earth. so assumption is, spiral galaxy is full of NLM. But what if there is not ample or very little NLM in spiral galaxy.Then it weakens the conclusion as its the scarcity and not the WL of the NLM which is resulting in this behavior.

(B) Luminous and nonluminous matter are composed of the same basic elements.
(C) The bright nucleus of a typical spiral galaxy also contains some nonluminous matter.
(D) The density of the observable universe is greater than most previous estimates have suggested.
(E) Some galaxies do not rotate or rotate too slowly for their rotational velocity to be measured.

118. It can be inferred from information presented in the passage that if the density of the universe were equivalent to significantly less than three hydrogen atoms per cubic meter, which of the following would be true as a consequence?
(A) Luminosity would be a true indicator of mass.
(B) Different regions in spiral galaxies would rotate at the same velocity.
(C) The universe would continue to expand indefinitely.
(D) The density of the invisible matter in the universe would have to be more than 70 times the density of the luminous matter.
(E) More of the invisible matter in spiral galaxies would have to be located in their nuclei than in their outer regions.

119. The authors propose all of the following as possibly contributing to the “missing matter” in spiral galaxies EXCEPT
(A) massive black holes
(B) small black holes
(C) small, dim stars
(D) massive stars
(E) large planets
_________________

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Regards :)

After evidence was obtained in the 1920s that the universe   [#permalink] 28 Aug 2014, 11:47
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