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Study Quizzes

Please read each question and select your answer from the choices provided. You must complete all of the questions in order to view your results. At the end of each exam, you have the option to e-mail your results to your instructor.


1:  With respect to the main sequence on the H-R diagram, protostars are located
A: on the lower part of the main sequence.
B: below and to the left of the main sequence.
C: above and to the right of the main sequence.
D: on the upper part of the main sequence.
E: (The statement is misleading. Protostars cannot appear on the H-R diagram.)

2:  Reflection nebulae look _____ than the star whose light they are scattering.
A: "redder"
B: "yellower"
C: "bluer"
D: (The statement is misleading. Reflection nebulae always look red.)
E: (The statement is misleading. Reflection nebulae always look blue.)

3:  Dark nebulae are
A: regions in space filled with very cool stars.
B: clouds of dust and gas.
C: regions of space that were cleared out by explosions of nearby stars.
D: holes in the heavens.
E: (We do not know what they are.)

4:  Interstellar extinction refers to
A: the ionization of a gas cloud around a star.
B: the 21-cm radiation emitted by interstellar hydrogen.
C: the 21-cm radiation absorbed by interstellar hydrogen.
D: the "clearing-out" of dust and gas particles in certain regions of space due to explosions of nearby stars.
E: the absorption and scattering of starlight by the interstellar material.

5:  T-Tauri stars
A: are characterized by very high temperatures.
B: rotate very fast.
C: are only found in the constellation Taurus.
D: show rapid and erratic changes in their brightness.
E: are normal stars of high mass.

6:  The study of star clusters
A: helps us understand how stars form.
B: provided evidence that low-mass protostars take longer to reach the main sequence than more massive protostars.
C: provided evidence that low-mass protostars take less time to reach the main sequence than more massive protostars.
D: reveals when stars end their main sequence part of their lives.
E: (All of the above but C.)

7:  The luminosity of a one-solar mass protostar is much higher than the Sun's luminosity. This energy
A: results from the gravitational collapse of the protostar.
B: results from nuclear reactions in the protostar's core.
C: comes from a nearby star, whose explosion started the collapse of the cloud forming the protostar.
D: comes from emission of light from the ionized gas cloud in which the protostar is forming.
E: (None of the above.)

8:  A star like our Sun takes about _____ years to form.
A: 5 billion
B: 30 million
C: 300,000
D: 30 thousand
E: 3000

9:  The presence of an emission nebula suggests the presence of
A: interstellar gas and a cool star.
B: interstellar gas and a hot star.
C: interstellar gas and dust.
D: interstellar dust and a cool star.
E: interstellar dust and a hot star.

10:  You are observing a star. A cloud, cooler than the star, is along the line of sight and is approaching Earth. The observed spectrum is
A: an absorption spectrum in which lines shift back and forth.
B: an absorption spectrum with additional redshifted lines.
C: an absorption spectrum with additional blueshifted lines.
D: an emission spectrum with additional blueshifted lines.
E: an emission spectrum with additional redshifted lines.

11:  Polycyclic aromatic hydrocarbons
A: are inorganic molecules found in interstellar dust.
B: are organic molecules found in the interstellar medium.
C: provide a tool to understanding the abundances of chemicals related to life.
D: are common in daily life.
E: (All of the above but A.)

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