Stars
Practice Test
1.
Where does the Sun's energy originate in the figure?
a.
C
b.
B
c.
A
d.
A and C
2.
The difference of two stars' spectra is due to the difference of their __________.
a.
temperature
b.
composition
c.
apparent magnitude
d.
luminosity
3.
The Sun contains __________ percent of all the mass in our solar system.
a.
10
b.
100
c.
99
d.
1
4.
According to the H-R diagram, which are the most common stars.
a.
white dwarfs
b.
main sequence
c.
supergiants
d.
giants
5.
What layer of the Sun's atmosphere is above the chromosphere?
a.
stratosphere
b.
corona
c.
troposphere
d.
photosphere
6.
How is the composition of a white dwarf determined?
a.
by the size of its planetary nebula
b.
by how many reaction phases it went through
c.
by the size of the supernova
d.
by its luminosity
7.
Gas flows outward from the corona and forms the __________.
a.
solar flare
b.
sunspot
c.
aurora
d.
solar wind
8.
Why doesn't apparent magnitude actually measure the brightness of the star?
a.
It doesn't account for energy output.
b.
It doesn't account for distance.
c.
It doesn't account for composition.
d.
It doesn't account for temperature.
9.
From what does a star form?
a.
a main sequence
b.
a spectra
c.
a binary
d.
a nebula
10.
A __________ is visible light arranged according to wavelength.
a.
solar flare
b.
auroras
c.
emission spectrum
d.
spectrum
11.
Why do astronomers rely on computer models for an explanation of the Sun's interior?
a.
The interior can't be directly observed.
b.
They need more than the observations of the interior.
c.
to remove the effects of the solar wind
d.
The interior is only visible during a solar eclipse.
12.
Which spectrum is used to identify the composition of a star?
a.
A
b.
B
c.
C
d.
all of the above
