Astronomy 120 - Stars and Galaxies » Fall 2022 » Unit 9 Quiz
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Question #1
RR Lyrae variable stars are a class of pulsating variable stars that have variations in their light output. The period (time associated) with this light variability (brightening and dimming and brightening up again) of RR Lyrae stars is approximately
A.
a day
B.
a millenium
C.
a century
D.
a millisecond
Question #2
A star will evolve off the main sequence only when
A.
the star reaches a certain size.
B.
the core has virtually no hydrogen left.
C.
the star reaches a certain mass.
D.
the core reaches a certain temperature.
Question #3
Once helium ignites in the core of a medium-mass star, the star grows unstable. It becomes
A.
a Cepheid variable star
B.
a supernova.
C.
a main sequence star.
D.
an RR Lyrae type of variable star.
Question #4
The final result of the evolution of a low-mass star will be
A.
a carbon ball.
B.
an oxygen ball.
C.
a helium ball.
D.
a hydrogen ball.
Question #5
Which of the following sequences correctly describes the basic evolutionary stages of a medium-mass star?
A.
White dwarf, red giant, main-sequence, protostar
B.
Protostar, main-sequence, red giant, white dwarf
C.
Protostar, main-sequence, white dwarf, red giant
D.
Protostar, red giant, main-sequence, white dwarf
Question #6
A star like the Sun will not form an iron core during its evolution because
A.
the iron it makes by nucleosynthesis is all fused into uranium.
B.
all the iron will be ejected when it becomes a planetary nebula.
C.
its strong magnetic fields keep its iron in its atmospheres.
D.
its core never gets hot enough for it to make iron by nucleosynthesis.
Question #7
The final product of the evolution of a low-mass star is
A.
primarily a hydrogen ball with a helium core.
B.
primarily a helium ball with a hydrogen core.
C.
a helium ball.
D.
a hydrogen ball, with a helium shell surrounding a hot carbon core.
Question #8
Cepheid variable stars regularly change their
A.
temperature, color, absolute magnitude, size
B.
temperature, luminosity, mass
C.
temperature, luminosity, absolute magnitude, size
Question #9
The most massive stars last the longest time on the main sequence.
A.
False
B.
True
Question #10
A(n) star is a high mass star that changes its brightness significantly and repeatedly.
A.
neutron
B.
Protostar
C.
Cepheid
Question #11
The outer most layers of an evolved medium mass star are expelled from the star to form a
A.
brown dwarf
B.
planetary nebula
C.
supernova remnant
D.
molecular nebula
Question #12
Where are the Cepheid and RR Lyrae variable stars located on the HR Diagram?
A.
just above and to the right of O type stars.
B.
just above and to the right of B type stars.
C.
outside the HR Diagram as missing items.
D.
in the instability strip.
Question #13
The fusion of helium into carbon will take a temperature of at least
A.
100 million degrees Kelvin
B.
10 million degrees Kelvin
C.
600 million degrees Kelvin
D.
50 million degrees Kelvin
Question #14
The remnant of a star that was once a 30-solar-mass main sequence star is now a
A.
helium ball.
B.
neutron star.
C.
white dwarf.
D.
black hole.
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