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Because of the proximity and likeness of Mars to Earth, scientists hav

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Because of the proximity and likeness of Mars to Earth, scientists hav  [#permalink]

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New post Updated on: 07 Aug 2018, 06:28
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Life on Mars
Because of the proximity and likeness of Mars to Earth, scientists have long speculated about the possibility of life on Mars. As early as the mid 17th century, astronomers observed polar ice caps on Mars, and by the mid-19th century, scientists discovered other similarities to Earth, including the length of day and axial tilt. But in 1965, photos taken by the Mariner 4 probe revealed a Mars without rivers, oceans or signs of life. And in the 1990s, it was discovered that Mars, unlike Earth, no longer possessed a substantial global magnetic field, allowing celestial radiation to reach the planet's surface and solar wind to eliminate much of Mars's atmosphere over the course of several billion years.

More recent probes have focused on whether there was once water on Mars. Some scientists believe that this question is definitively answered by the presence of certain geological landforms. Others posit that different explanations, such as wind erosion or carbon dioxide oceans, may be responsible for these formations. Mars rovers Opportunity and Spirit, which have been exploring the surface of Mars since 2004, have both discovered geological evidence of past water activity. These findings substantially bolster claims that there was once life on Mars.

1. The author’s stance on the possibility of life on Mars can best be described as
(A) optimistic
(B) disinterested
(C) skeptical
(D) simplistic
(E) cynical



2. The passage is primarily concerned with which of the following?
(A) disproving a widely accepted theory
(B) initiating a debate about the possibility of life on Mars
(C) presenting evidence in support of a controversial claim
(D) describing the various discoveries made concerning the possibility of life on Mars
(E) detailing the findings of the Mars rovers Opportunity and Spirit



3. Each of the following discoveries is mentioned in the passage EXCEPT
(A) Wind erosion and carbon dioxide oceans are responsible for certain geological landforms on Mars.
(B) Mars does not have a substantial global magnetic field.
(C) Mars does not currently have water activity.
(D) The length of day on Mars is similar to that on Earth.
(E) The axial tilt of Mars is similar to that of Earth.



4. In the first paragraph, the author most likely mentions the discovery of polar ice caps to
suggest that

(A) until recently Mars’ polar ice caps were thought to consist largely of carbon dioxide
(B) Martian polar ice caps are made almost entirely of water ice
(C) Mars has many similarities to Earth, including the existence of polar ice caps
(D) Mars has only a small fraction of the carbon dioxide found on Earth and Venus
(E) conditions on the planet Mars were once very different from what they are at present



5. Each of the following can be inferred from the passage EXCEPT
(A) The presence of certain geological landforms is not definitive proof that there was once life on Mars.
(B) It is likely that there were few significant discoveries related to the possibility of life on Mars prior to the mid-17th century.
(C) The absence of a substantial global magnetic field on Mars suggests that it would be difficult to sustain life on Mars.
(D) The presence of water activity on Mars is related to the possibility of life on Mars.
(E) The claim that there was once water on Mars has only limited and indirect support from recent discoveries.





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Originally posted by BrainLab on 08 Mar 2015, 02:56.
Last edited by workout on 07 Aug 2018, 06:28, edited 1 time in total.
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Re: Because of the proximity and likeness of Mars to Earth, scientists hav  [#permalink]

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New post 08 Mar 2015, 23:57
7 mins-- All correct
Please ignore Question 1 as TONE questions are almost killed by the test pattern. In mgmat site also Stacey has suggested to ignore that question.
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Re: Because of the proximity and likeness of Mars to Earth, scientists hav  [#permalink]

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New post 09 Mar 2015, 01:26
in question 5 how can B be inferred … pls explain
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Re: Because of the proximity and likeness of Mars to Earth, scientists hav  [#permalink]

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New post 09 Mar 2015, 02:22
Udai wrote:
in question 5 how can B be inferred … pls explain



Hi

Few basically means lack of something

The first para says " scientists have long speculated about the possibility of life on Mars. As early as the mid-17th century "

This means that scientists have been working before the 17th century and got some healthy results in 17th and dr was some lack of evidence before that.
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Re: Because of the proximity and likeness of Mars to Earth, scientists hav  [#permalink]

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New post 18 Sep 2018, 17:20
9 mins ques 5 wrong rest correct

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Re: Because of the proximity and likeness of Mars to Earth, scientists hav &nbs [#permalink] 18 Sep 2018, 17:20
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