Download Test 3 Version 3 1. Milky Way halo stars follow: (a) differential

Test 3
Version 3
1. Milky Way halo stars follow: (a) differential rotation, (b) solid disk rotation, (c) randomly inclined
elliptical orbits, (d) randomly inclined circular orbits.
2. Which of the following is false: The Milky Way is (a) diffuse band of light across the sky, (b) a spiral
galaxy, (c) the galaxy the sun is in, (d) the nearest galaxy outside our own.
3. Which one of the following statements is true? (a) stars in the halo are deficient in heavy elements, (b)
stars in the galactic disk are deficient in heavy elements, (c) stars in the nucleus have the largest amounts of
heavy elements, (d) all chemical elements are distributed more or less uniformly throughout all parts of the
galaxy.
4. The observed distribution of globular clusters indicates that the gas cloud from which the galaxy formed
was: (a) disk-shaped, (b) spherical, (c) highly elliptical.
5. The disk-like shape of our galaxy provides evidence that the early galaxy: (a) was a strong x-ray emitter,
(b) had a high temperature, (c) had a strong magnetic field, (d) rotated, (e) had a high abundance of heavy
elements.
6. A galaxy whose color is reddish would be: (a) spiral, (b) elliptical, (c) irregular, (d) indeterminate; color
has nothing to do with galaxy type.
Matching: (a) spiral galaxies, (b) elliptical galaxies
7. Most are roughly the same size and mass. A
8. Show the largest spread in luminosity. B
9. Most numerous types in the universe. A
10. Reddish color. B
11. Composed only of cool stars. B
12. Have almost no gas or dust. B
13. Have no current star formation. B
14. Spiral arms are marked by: (a) white dwarfs, (b) high mass stars, (c) solar-type stars, (d) globular
clusters, (e) all of the above.
15. If star formation occurs early during the collapse of a gas cloud to form a galaxy, the result will be a(n):
(a) elliptical galaxy, (b) normal spiral galaxy, (c) barred spiral galaxy, (d) irregular galaxy.
16. The spiral arms of a spiral galaxy are thought to have been caused by: (a) Newton’s laws, (b) relativity,
(c) self-propagating (stochastic) star-formation, (d) density waves (e) c & d
17. As the galaxy ages, the percentage of metals in the newer stars should: (a) increase, (b) decrease,
(c) remain the same.
18. The Hubble constant is most closely related to the - - - of the universe: (a) size, (b) mass, (c) age,
(d) luminosity.
19. The observed temperature of the microwave background is nearly: (a) 3 K, (b) 10 K, (c) 30 K, (d) 100 K,
(e) 1000 K.
20. The age of the universe is estimated by astronomers to be about: (a) 50,000 years, (b) 4.6 billion years,
(c) 14 billion years, (d) 24 billion years, (e) 1 trillion years.
21. Except for hydrogen, the most abundant element formed in the big bang was: (a) helium, (b) oxygen,
(c) nitrogen, (d) carbon, (e) iron.
22. The abundances of helium and hydrogen in the universe were set during the first: (a) half hour,
(b) century, (c) 1000 years, (d) million years.
23. Immediately after the Big Bang, the universe was made up of: (a) galaxies, (b) radiation, (c) quasars,
(d) matter, (e) none of the above.
24. When we observe distant galaxies we are observing objects that APPEAR: (a) very young, (b) very old,
(c) objects having the approximate age of our galaxy, (d) no statement can be made about age.
Matching
The distance determination techniques in the right hand column should be matched to the most
appropriate class of objects in the left hand column. Use a different letter for each question.
25. Nearby stars
B
a) spectroscopic parallax
26. Nearby galaxies
C
b) trigonometric parallax
27. Planets in our solar system
D
c) variable stars
28. Distant stars in the Milky Way
A
d) radar
29. Moderately distant galaxies
E
(e) HII region size
30.
A quasar is an active galaxy where a) we are looking at a distant galaxy viewing it edge-on
b) a nearby galaxy being viewed edge-on
c) a distant galaxy viewed nearly face-on
d) a nearby galaxy viewed nearly face-on
31.
Evidence obtained over the last few years indicates that a quasar is most probably
A) the remnant core of an exploding star or supernova.
B) the focused image of a distant galaxy by the gravitational lens effect of a closer galaxy.
C) evidence of very intense star-building activity in certain distant dust and gas clouds.
D) the central nucleus of very distant, very active galaxy.
32.
Variations in the output of quasars within a few hours are an indication
A) of the rapid rotation of the sources.
B) that these objects are actually binary systems in which we see mutual eclipses.
C) of the relatively small size of the emitting regions.
D) of obscuring gas and dust clouds moving in front of them from our point of view.
33. Which of the following is not a theoretical characteristic of a black hole, according to the general theory
of relativity?
A to an outside observer, an object falls into the black hole very quickly.
B an outside observer will never see an object reach the black hole.
C an observer falling into a black hole takes a very short time to reach the object at its center.
D an outside observer loses contact with an observer falling into a black hole when the black hole
boundary is crossed.
34. light which approaches the event horizon of a black hole is
A totally reflected
B only partially reflected
C totally absorbed
D reflected before it reaches the surface
35. Which of the following can escape from within a "black hole radius" of a black hole?
A photons
B anti-particles
C gamma rays
D none of the above or anything else, for that matter
36. black holes
A have been proven to exist by direct observation, i.e. we can see the black hole itself
B probably do not exist
C may be inferred to exist from observations in the last few decades
D can be produced in the laboratory
Above is a sketch of the Milky Way, seen edge on. Please designate the location of the following:
37. Halo E
38. Disk B
39. Globular cluster D
40. Bulge A