VERSION C

Write your name at the top of this quiz as well as on your answer sheet. WRITE YOUR VERSION ON YOUR ANSWER SHEET. Feel free to write or draw on the quiz. Please put away all electronic devices. You will not need a calculator for this quiz.

CHOOSE THE BEST ANSWER FOR EACH PROBLEM.

1. Which of the following objects has the largest radius?
a) a one solar mass white dwarf.
b) a two solar mass neutron star.
c) the event horizon of a one solar mass black hole.
d) the event horizon of a Jupiter mass black hole.
e) the event horizon of an Earth mass black hole.

a) a one solar mass white dwarf.

2. The Chandrasekhar limit is:
a) The closest distance one can get to a black hole, and still be able to escape from the black hole.
b) The upper limit to the mass of a neutron star.
c) The upper limit to the mass of a white dwarf.
d) The upper limit to the mass of a black hole.
e) The upper limit to the mass of a brown dwarf.

c) The upper limit to the mass of a white dwarf.

3. Neutron stars:
a) Can sometimes be detected as X-ray bursters.
b) Can sometimes be detected as pulsars.
c) Are sometimes produced in supernovae explosions.
d) Have masses between 1.4 and 3 solar masses.
e) All of the above.

e) All of the above.

4. Which of the following measurements is NOT yet possible, even with modern astronomical instruments?
a) Observing a globular cluster in the bulge of the Milky Way.
b) Measuring the rotation of galaxies in the plane of the sky.
c) Measuring the period of Cepheid variables in the Andromeda Galaxy.
d) Measuring the mass of the black hole in the center of the Milky Way.
e) Measuring the stellar parallax of alpha Centauri.

b) Measuring the rotation of galaxies in the plane of the sky.

5. The Small and Large Magellanic Clouds are:
a) Small companion galaxies to the Milky Way.
b) Dense molecular clouds near the center of the Milky Way.
c) Two Planetary nebulae seen in the southern sky.
d) Two remnants of supernovae seen in the southern sky.
e) Elliptical galaxies in the Virgo Cluster of galaxies.

a) Small companion galaxies to the Milky Way.

6. An object with a diameter of about 20 km and a mass of about 2 solar masses is likely a:
a) white dwarf.
b) neutron star.
c) brown dwarf.
d) main sequence M star.
e) horizontal branch star.

b) neutron star.

7. RR Lyrae stars are:
a) brown dwarfs.
b) neutron stars that produce regular pulses of light.
c) normal stars in a mass transfer binary system with a black hole.
d) normal stars in a mass transfer binary system with a white dwarf.
e) variable stars that lie above the main sequence on the H-R diagram.

e) variable stars that lie above the main sequence on the H-R diagram.

8. Jocelyn Bell is best known for:
a) discovering the period-luminosity relation for Cepheid variable stars.
b) discovering the first pulsar.
c) proving that `spiral nebulae' are outside of the Milky Way.
d) being the first person to show that the Sun is not the center of the Milky Way.
e) being the first person to accurately measure stellar parallax.

b) discovering the first pulsar.

9. Sagittarius A* is the name of:
a) The first pulsar ever found.
b) A 10 solar mass black hole.
c) The black hole in the center of the Milky Way.
d) A small companion galaxy to the Milky Way.
e) A small companion galaxy to the Andromeda galaxy.

c) The black hole in the center of the Milky Way.

10. Light produced from accelerated charged particles is called:
a) Thermal radiation.
b) Linear radiation.
c) Line radiation.
d) Synchrotron radiation.
e) Heat radiation.

d) Synchrotron radiation.

11. Who was the first person to classify spiral and elliptical galaxies into sub-types according to their appearance?
a) Henrietta Leavitt.
b) Harlow Shapley.
c) Edwin Hubble.
d) William Herschel.
e) Robert Trumpler.

c) Edwin Hubble.

12. Which of the following objects has an escape velocity greater than the speed of light?
a) a black hole.
b) a neutron star.
c) a white dwarf.
d) a brown dwarf.
e) all of the above.

a) a black hole.

13. The rotation curves of the outer parts of spiral galaxies provide evidence for:
a) black holes.
b) dark matter.
c) electron degeneracy pressure.
d) neutron stars.
e) neutron degeneracy pressure.

b) dark matter.

14. Most of the following types of objects are mainly found in the disk of the Milky Way. Which of the following is the exception, also being seen regularly in the bulge and halo?
a) open clusters.
b) HII regions.
c) SN Type II.
d) O and B main sequence stars.
e) globular clusters.

e) globular clusters.

15. What is the main difference between E0 and E7 galaxies?
a) E0 galaxies are much larger, in physical diameter.
b) E7 galaxies are flatter in appearance, while E0 galaxies are round.
c) E7 galaxies have spiral arms; E0 galaxies do not.
d) E0 galaxies have bars in the center; E7 galaxies do not.
e) E0 galaxies have tightly wrapped spiral arms; E7 galaxies have loosely wrapped spiral arms.

b) E7 galaxies are flatter in appearance, while E0 galaxies are round.

16. The best-known example of a ring galaxy is the Cartwheel galaxy, shown in the picture at the right. This was likely formed by:
a) the merger of two spiral galaxies of equal mass.
b) an elliptical galaxy evolving into a spiral galaxy.
c) the head-on collision between a small galaxy and a disk galaxy.
d) a central black hole eating away at the center of the galaxy, producing a ring.
e) two equal-mass spiral galaxies interacting, producing tidal tails that resemble a ring.

c) the head-on collision between a small galaxy and a disk galaxy.

17. A white dwarf in a mass transfer binary system may eventually become:
a) A nova.
b) A Type I supernova.
c) A Type II supernova.
d) Either or both a) and b) above.
e) All or any of a), b) and c) above.

d) Both a) and b) above.

18. A galaxy with a large bulge relative to the disk and tightly wrapped spiral arms is most likely a/an:
a) Sc galaxy.
b) E0 galaxy.
c) S0 galaxy.
d) Sd galaxy.
e) Sa galaxy.

e) Sa galaxy.

19. The first evidence that the so-called `spiral nebulae' are large objects outside of our own galaxy was found by:
a) Adriaan van Maanen
b) Harlow Shapley
c) Edwin Hubble
d) Henrietta Leavitt
e) Robert Trumpler

c) Edwin Hubble

20. The long tails seen in visible light photographs of the Antennae galaxies were produced from:
a) the collision of two spiral galaxies.
b) the collision of two elliptical galaxies.
c) jets of charged particles from a massive black hole.
d) the head-on collision of a dwarf elliptical galaxy and a disk galaxy.
e) the galaxy probably originally formed in that shape, for unknown reasons.

a) the collision of two spiral galaxies.