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 millisecond
C.
a millenium
D.
a century
Question #2
A star will evolve off the main sequence only when
A.
the star reaches a certain mass.
B.
the star reaches a certain size.
C.
the core has virtually no hydrogen left.
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.
an RR Lyrae type of variable star.
B.
a supernova.
C.
a main sequence star.
D.
a Cepheid variable star
Question #4
The final result of the evolution of a low-mass star will be
A.
an oxygen ball.
B.
a helium ball.
C.
a carbon 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, white dwarf, red giant
C.
Protostar, main-sequence, red giant, white dwarf
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.
its strong magnetic fields keep its iron in its atmospheres.
C.
its core never gets hot enough for it to make iron by nucleosynthesis.
D.
all the iron will be ejected when it becomes a planetary nebula.
Question #7
The final product of the evolution of a low-mass star is
A.
primarily a hydrogen ball with a helium core.
B.
a hydrogen ball, with a helium shell surrounding a hot carbon core.
C.
a helium ball.
D.
primarily a helium ball with a hydrogen core.
Question #8
Cepheid variable stars regularly change their
A.
temperature, luminosity, mass
B.
temperature, luminosity, absolute magnitude, size
C.
temperature, color, 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.
Cepheid
B.
Protostar
C.
neutron
Question #11
The outer most layers of an evolved medium mass star are expelled from the star to form a
A.
molecular nebula
B.
planetary nebula
C.
brown dwarf
D.
supernova remnant
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.
in the instability strip.
C.
outside the HR Diagram as missing items.
D.
just above and to the right of B type stars.
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.
50 million degrees Kelvin
D.
600 million degrees Kelvin
Question #14
The remnant of a star that was once a 30-solar-mass main sequence star is now a
A.
neutron star.
B.
helium ball.
C.
black hole.
D.
white dwarf.
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