Astronomy 120 - Stars and Galaxies » Fall 2022 » Unit 9 Quiz
Need help with your exam preparation?
Get Answers to this exam for $6 USD.
Get Answers to all exams in [ Astronomy 120 - Stars and Galaxies ] course for $25 USD.
Existing Quiz Clients Login here
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 millisecond
B.
a century
C.
a day
D.
a millenium
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.
a hydrogen ball.
B.
a carbon ball.
C.
an oxygen ball.
D.
a helium ball.
Question #5
Which of the following sequences correctly describes the basic evolutionary stages of a medium-mass star?
A.
Protostar, main-sequence, white dwarf, red giant
B.
Protostar, main-sequence, red giant, white dwarf
C.
White dwarf, red giant, main-sequence, protostar
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 helium ball with a hydrogen core.
B.
a hydrogen ball, with a helium shell surrounding a hot carbon core.
C.
primarily a hydrogen ball with a helium core.
D.
a helium ball.
Question #8
Cepheid variable stars regularly change their
A.
temperature, luminosity, absolute magnitude, size
B.
temperature, color, absolute magnitude, size
C.
temperature, luminosity, mass
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.
Cepheid
C.
Protostar
Question #11
The outer most layers of an evolved medium mass star are expelled from the star to form a
A.
molecular nebula
B.
supernova remnant
C.
planetary nebula
D.
brown dwarf
Question #12
Where are the Cepheid and RR Lyrae variable stars located on the HR Diagram?
A.
outside the HR Diagram as missing items.
B.
in the instability strip.
C.
just above and to the right of B type stars.
D.
just above and to the right of O type stars.
Question #13
The fusion of helium into carbon will take a temperature of at least
A.
50 million degrees Kelvin
B.
600 million degrees Kelvin
C.
100 million degrees Kelvin
D.
10 million degrees Kelvin
Question #14
The remnant of a star that was once a 30-solar-mass main sequence star is now a
A.
black hole.
B.
white dwarf.
C.
neutron star.
D.
helium ball.
Need help with your exam preparation?
Get Answers to this exam for $6 USD.
Get Answers to all exams in [ Astronomy 120 - Stars and Galaxies ] course for $25 USD.
Existing Quiz Clients Login here