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Lecture 3

Astronomy 2021A/B Lecture 3: UnitQuiz-3Exam

Course Code
ASTR 2021A/B
Martin Zinke- Allmang

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Unit Quiz 3 — ASTRONOMY 2021
From Chapter 7:
Question 1:
If we argue that organic molecules need to chemically react
in order to allow for life, this suggests we should search for
worlds in the solar system that have ...
A) either an atmosphere or a surface liquid medium such as
B) organic molecules on their surfaces
C) an atmosphere with a pressure high enough to sustain
water in the liquid state
D) rocky surfaces
E) an ocean spanning the entire surface
Question 2:
The planet Saturn is approximately 10 times farther away
from the Sun than the Earth is. Given this, how much sun-
light does it receive compared to the Earth?
A) 1/10,000th
B) 1/1000th
C) 1/100th
D) 1/10th
E) the same
Question 3:
A newly discovered asteroid is found to be 50% closer to the
Sun than the Earth is. Given this, how much sunlight does it
receive compared to the Earth?
A) one quarter as much
B) half as much
C) about the same
D) twice as much
E) four times as much
Question 4:
If ice were denser than water, during winter lakes and ponds
would ...
A) completely freeze
B) remain liquid
C) freeze on the surface but remain liquid beneath
D) freeze on the bottom but remain liquid at the surface
E) dry up by sublimation
Question 5:
Which of the following molecules (present on some planets
and moons) has the widest temperature range over which it
is a liquid?
A) ammonia
B) methanol
C) methane
D) ethane
E) carbon dioxide
Question 6:
Even though ethane (C2H6) has a liquid temperature range
almost as wide as water, it is not a good solvent for bio-
molecules for two reasons: first, it is not polar and would
therefore not dissolve most polar organic molecules and
salts, and second because it is a liquid at ...
A) much higher temperatures which would result in the
breakdown of fragile biological molecules
B) very high pressures that are unlikely to be found else-
C) very low pressures that are unlikely to be found else-
D) much lower temperatures which would result in ex-
tremely slow metabolic reactions
Question 7:
Venus may have been more Earth-like in the distant past
because ...
A) it was rotating more rapidly
B) the Sun was dimmer, putting out less solar radiation
C) it was not as close to the Sun
D) its atmosphere was thinner
E) its atmosphere didn't contain sulfuric acid
Question 8:
Although definitively ruled out, if Earth-like life could sur-
vive on Venus today, it would have to be ...
A) at the centre of the planet
B) just beneath the surface
C) on the surface
D) in Venus's oceans
E) floating high in the atmosphere
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