Practice test H
Click on the circle in front of the appropriate response. There is only
correct response for each question. Make sure you answer each question.
Which of the following is NOT produced during the proton-proton reaction?
The temperature of the photosphere is roughly
a. 5000 K.
b. 50,000 K.
c. 100,000 K.
d. 1,000,000 K.
Which of the following statements about the Solar corona is FALSE?
a. it is a source of X rays
b. it has a smooth, spherical shape
c. it has a temperature of 1 to 2 million K
d. prominences are found there
If it were possible to observe stellar parallax from another planet, which planet listed below would provide the most accurate distances to the farthest stars?
Who is known for classifying over 200,000 stars and producing the Henry Draper Catalog?
a. Henry Draper
b. Edward C. Pickering
c. Henrietta Leavitt
d. Annie J. Cannon
Which of the following is NOT in itself useful for determining stellar temperature?
a. spectral class
c. absolute magnitude
d. degree of ionization
e. Wien's Law
Star A is a G3V, while Star B is a K3I. Which star is more luminous?
c. they have the same luminosity
d. not possible to determine luminosity from the information
Which of the following represents the approximate range of stellar masses?
a. all stars have roughly the same mass
b. 1.0 to 10 solar masses
c. 0.1 to 10 solar masses
d. 0.05 to 50 solar masses
e. 0.01 to 1000 solar masses
Low mass stars burn hydrogen in the __________ ; massive stars burn hydrogen in the __________ .
a. proton-proton chain; proton-proton chain
b. carbon-nitrogen-oxygen cycle; carbon-nitrogen-oxygen cycle
c. proton-proton chain; carbon-nitrogen-oxygen cycle
d. carbon-nitrogen-oxygen cycle; proton-proton chain
e. triple-alpha reaction; proton-proton chain
The production of more and more massive chemical elements requires ever increasing
a. amounts of hydrogen.
Stars on the upper end of the main sequence next evolve into
a. red dwarfs.
b. lower main sequence stars.
c. solar-type stars.
d. white dwarfs.
e. red giants.
Protostars in dark, dusty regions may be studied in the __________ spectral region.
As a star converts its hydrogen to helium, the position of the star in the H-R diagram moves mostly toward
a. higher density.
b. lower temperature.
c. higher luminosity.
d. lower luminosity.
e. lower radius.
Which of the following objects is electron degenerate?
a. A main sequence star.
b. A black hole.
c. A white dwarf.
d. A neutron star.
In the most massive stars, the heaviest element which will be produced in the core will be
A star which has a main sequence mass of 10 solar masses will most likely end up as
a. a T Tauri star.
b. a white dwarf.
c. a neutron star.
d. a black hole.
In a galaxy, supernova will be observed on average _______ every century.
a. 1000 times
b. 10 times
d. hardly ever
How can astronomers determine which type of supernovae they are observing?
a. Type I supernovae fade much more quickly than Type II
b. the brightnesses are different
c. the spectral features are different
d. by determining exactly which object produced the supernova
A millisecond pulsar may realistically have a frequency of approximately
a. a million pulses per second.
b. 1000 pulses per second.
c. 1 pulse per second.
d. 1 pulse per 10 seconds.
e. 1 pulse per minute.
Which of the following lists the stellar remnants in order of decreasing maximum mass?
a. neutron star, white dwarf, black hole
b. black hole, neutron star, white dwarf
c. white dwarf, black hole, neutron star
d. black hole, white dwarf, neutron star
e. they all have approximately the same mass
Place the most appropriate word or words in the blank. You may have to click on the blank to activate it before you start typing in your answer.
A rotating disk of gas surrounding a compact object formed by material falling inward is called a(n)
The specific nuclear reaction which produces energy in the Sun is called the
The two most abundant elements in the Sun are
The most important use of binary stars is in determining the property of
The specific hydrogen burning reaction occurring in stars more massive than the Sun is the
The very hot, extended outer atmosphere of the Sun and other cool main sequence stars is called the
A star in the
stage would be found to the left of the upper part of the main sequence on an H-R diagram..
Hydrogen burning for a 1 M star lasts for
A star with a main sequence mass of 40 or more solar masses will end up as a(n)
White dwarf stars cannot be more massive than
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