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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:  Which of the following is true about the Hubble law?
A: The recessional speed of a galaxy is inversely proportional to its distance.
B: When used to find the distance to a nearby galaxy the result might be way off.
C: The recessional speed of a galaxy at a distance of 100 Mly is about 1000 km/s.
D: The ratio between recessional speed and distance is a constant of nature, just like the gravitational constant.
E: It can only be applied to galaxies at great distances from us.

2:  Which of the following is true about the Tully-Fisher relation?
A: From the galaxy's rotation speed we find its absolute magnitude.
B: In order to find the distance to a galaxy, we need to know its apparent magnitude.
C: The wider the 21-cm line of a spiral galaxy, the greater its luminosity.
D: (All of the above.)
E: (Only two of the choices A, B, and C.)

3:  Gravitational lenses
A: can be caused by massive black holes.
B: can be caused by massive galaxies.
C: can be caused by clusters of galaxies.
D: can give rise to an Einstein ring.
E: (All of the above.)

4:  Which of the following is true for a spiral galaxy?
A: Its nucleus contains Population II stars.
B: Its halo contains very young stars.
C: It contains small amounts of gas and dust.
D: Its spiral arms are composed mostly of Population II stars.
E: (All of the above.)

5:  An elliptical galaxy looks
A: reddish in the nucleus and bluish elsewhere (especially along the arms where new stars are forming).
B: reddish, because most of its stars are in their red giant phase.
C: reddish, because star formation happened a very long time ago.
D: bluish, because of active star formation.
E: (None of the above.)

6:  Which of the following is true for quasars?
A: Their apparent visible magnitudes are very small.
B: Their brightness varies on very short time scales, implying that they are small in size.
C: They have large blueshifts.
D: They are the nuclei of recently formed galaxies.
E: They are the nuclei of very old galaxies.

7:  The radio emission seen from a typical radio galaxy
A: comes from its radio lobes.
B: comes from the area surrounding the entire galaxy.
C: comes from its spiral arms.
D: comes mostly from the jets emanating from the central black hole.
E: comes mostly from the region around the central black hole.

8:  We say that quasars, blazars, and radio galaxies are really the same thing because
A: they are really the same objects.
B: their spectra are the same.
C: we can explain observations of these objects with a single model.
D: they all show superluminal motions.
E: they all form identical gravitational lenses.

9:  Observations show that clusters of galaxies are filled with
A: a high temperature, high density gas.
B: a low temperature, low density gas.
C: a low temperature, high density gas.
D: a high temperature, low density gas.
E: (The statement is misleading. The space between galaxies in a cluster is a perfect vacuum.)

10:  A redshift of z = 5 corresponds to a recessional speed of
A: 5/6 the speed of light.
B: 84.6% of the speed of light.
C: 5 times the speed of light.
D: 1/5 the speed of light.
E: 35/37 of the speed of light.

11:  Cold dark matter
A: makes up about 20% of the universe.
B: is low-energy normal matter.
C: can be detected by the radiation it emits; however, this is very difficult to do because of the radiation's low energy.
D: particles move at speeds close to the speed of light.
E: (All of the above.)

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