Life in the Universe 4th Edition By Jeffrey O. Bennett – Test Bank

Chapter 11 Extrasolar Planets: Their Nature and Potential Habitability
1) Stars are mostly made of
A) hydrogen and helium
B) pure hydrogen
C) carbon, hydrogen, oxygen and nitrogen
D) an equal mixture of all elements
Answer: A
2) Compared to young stars, very old stars have
A) exactly the same chemical composition
B) a lower proportion of elements heavier than helium
C) a higher proportion of elements heavier than helium
D) no elements heavier than helium at all
Answer: B
3) The presence of elements heavier than helium in stars is very important because
A) they provide the raw materials for the formation of planets and life
B) without them they could not form
C) they help stabilize their interiors
D) they are responsible for the fusion reactions at their centers
Answer: A
4) Stars spend most of their lives
A) fusing hydrogen into helium in their cores
B) slowly dimming as they die with no fusion occurring in their cores
C) as slowly brightening protostars
D) fusing helium into carbon in their cores
Answer: A
5) The most important property of a star which determines its evolution is its
A) chemical composition
B) surface temperature
C) mass
D) radius
Answer: C
6) What is the minimum possible mass for a star?
A) 0.01 solar masses
B) 0.008 solar masses
C) 0.1 solar masses
D) 0.08 solar masses
Answer: D
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7) The color of a star is a measure of its
A) surface temperature
B) chemical composition
C) mass
D) size
Answer: A
8) The intrinsic brightness of a star is referred to as its
A) radiance
B) luminosity
C) surface temperature
D) apparent brightness
Answer: B
9) One of the fundamental principles of stellar evolution is that the more massive a star is
A) the more heavy elements it contains
B) the more planets it has around it
C) the faster it evolves
D) the slower it evolves
Answer: C
10) A star less massive than our Sun
A) will have a longer lifetime
B) will have a shorter lifetime
C) will have the same lifetime as the Sun
D) could have either a longer lifetime or a shorter lifetime depending on its chemical
composition
Answer: A