Final Study Guide

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What percentage of a star's total lifetime is spent on the main sequence?

Answer:
a)  100%
b)  20%
c)  90%
d)  10%
e)  50%
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  • Answered in Final Study Guide
    Why is Supernova 1987A particularly important to astronomers?
    a)It provided the first observational evidence that supernovae actually occur
    b)It provided the first evidence that neutron stars exist.
    c)It was the first supernova detected in nearly 400 years.
    d)It occurred only a few dozen light-years away from Earth.
    e)It was the nearest supernova detected in nearly 400 years.
    e)It was the nearest supernova detected in nearly 400 years.
  • Answered in Final Study Guide
    After a supernova event occurring in a high-mass star, what is left behind?
    a)Always a white dwarf
    b)always a black hole
    c)always a neutron star
    d)either a neutron star or a black hole
    e)either a white dwarf or a neutron star
    d)either a white dwarf or a neutron star
  • Answered in Final Study Guide
    Which event marks the beginning of a supernova?
    a)the expansion of a low-mass star into a red giant
    b)the onset of helium burning after a helium flash in a star with mass comparable to that of the sun.
    c)the sudden collapse of an iron core into a compact ball of neutrons
    d)the beginning of neon burning in extremely massive star
    e)the sudden outpouring of X-rays from a newly formed accretion disk.
    c)the sudden outpouring of X-rays from a newly formed accretion disk.
  • Answered in Final Study Guide
    What type of star is our Sun?
    a)a high-mass star
    b)an intermediate-mass star
    c)a low-mass star
    c)a low-mass star
  • Answered in Final Study Guide
    How many helium nuclei fuse together when making carbon?
    a)4
    b)3
    c)2
    d)It caries depending on the reaction
    e)Helium cannot fuse into carbon
    b)Helium cannot fuse into carbon
  • Answered in Final Study Guide
    Compared to the star it evolved from, a white dwarf is
    a)cooler and dimmer
    b)the same temperature and brightness
    c)hotter and dimmer
    d)cooler and brighter
    e)hotter and brighter
    c)hotter and brighter
  • Answered in Final Study Guide
    Which two energy sources can help a star maintain its internal thermal pressure?
    a)nuclear fusion and chemical reactions
    b)nuclear fission and gravitational contraction
    c)chemical reactions and gravitational contraction
    d)nuclear fusion and nuclear fission
    e)nuclear fusion and gravitational contraction
    e)nuclear fusion and gravitational contraction
  • Answered in Final Study Guide
    You discover a binary star system in which one member is a 15 solar mass main-sequence star and the other star is a 10 solar mass giant star. How do we believe that a star system such as this might have come to exist?
    a)Other than the very low odds of finding a system with two such massive stars, there is nothing surprising about the fact that such systems exist.
    b)Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main-sequence star millions of years later than its less massive companion.
    c)The giant must once have been the more massive star but transferred some of its mass to its companion.
    d)The main-sequence star probably is a pulsating variable star and therefore appears to be less massive than it really is.
    e)The two stars probably were once separate but became a binary when a close encounter allowed their mutual gravity to pull them together.
    c)The two stars probably were once separate but became a binary when a close encounter allowed their mutual gravity to pull them together.
  • Answered in Final Study Guide
    What is a shock wave?
    a)An electromagnetic wave that can create electrical shocks
    b)a pressure wave that moves faster than the speed of sound
    c)a pressure wave that moves faster than the speed of light
    d)An electromagnetic wave created when electrons recombine with protons
    e)A pressure wave that moves slower than the speed of sound
    b)A pressure wave that moves slower than the speed of sound
  • Answered in Final Study Guide
    Compared to spiral galaxies, elliptical galaxies are
    a)bluer and flattened
    b)always much smaller
    c)redder and flattened
    d)bluer and rounder
    e)redder and rounder
    e)redder and rounder
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Free Quiz Question From Final Study Guide
Question: What percentage of a star's total lifetime is spent on the main sequence?
Answer:
100%
20%
90%
10%
50%