QUIZ - II



1.- What two observations of an object allow for deriving the rotation curve of the Milky Way?

(1) Object's velocity and distance from the galactic center.
(2) Object's age and distance from the galactic center.
(3) Object's luminosity and age.
(4) Object's velocity and color.
(5) Object's size and luminosity.

2.- What type of variable star was used by Hubble to determine the distance to the Andromeda galaxy?

(1) Cepheids.
(2) RR Lyrae.
(3) T Tauri.
(4) Neutron stars.
(5) Novae

3.- Which is the correct description of the Sun's location within the Milky Way?

(1) In the disc and about one-half a galactic radius from the center.
(2) At the outer edge of the galactic bulge but in the plane of the disc.
(3) In the disc but at its outer edge.
(4) In the center of the galaxy.
(5) In the halo.

4.- Which of the following is not found in the Galaxy's halo?

(1) Emission nebulae containing young stars.
(2) Globular clusters
(3) Old stars
(4) Stars with random, three dimensional orbits
(5) Red stars

5.- What property is common to all spiral galaxies?

(1) All of the other four answers are correct.
(2) The existence of a disk, a bulge, and a halo.
(3) Abundant interstellar gas.
(4) Ongoing star formation.
(5) Spiral arms.

6.- What distance indicator is used to map the positions of the most distant galaxies known so far?

(1) The Hubble Law.
(2) The Cepheids Luminosity-Period relationship.
(3) The Tully-Fisher relationship.
(4) The H-R Diagram.
(5) Radar.

7.- Which of the following is the Hubble Law?

(1) The greater the distance to a galaxy, the greater its redshift.
(2) The greater the distance to a galaxy, the fainter it is.
(3) The more distant a galaxy is, the older it appears.
(4) The greater the distance to a galaxy, the greater its blueshift.
(5) All of the other four answers are correct.

8.- What are the three main galaxy morphological types?

(1) Ellipticals, Spirals, and Irregulars.
(2) Disk, bulge, and halo.
(3) Spiral arms, bars, and star formation regions.
(4) Globular clusters, open clusters, and molecular clouds.
(5) None of the other four answers are correct.

9.- What observations provide evidence that there is a misterious dark matter in the universe that does not emit radiation?

(1) Spiral galaxies have flat rotation curves at very large radii, and galaxies in clusters have higher velocity dispersions than those inferred from the observed stellar masses.
(2) Our galaxy has many dust obscured regions and many dark molecular clouds.
(3) The night sky is dark.
(4) There are supermassive black holes in the centers of galaxies.
(5) All of the other four answers are correct.

10.- What is the "bottom-up" scenario of structure formation in the universe?

(1) Small, dwarf galaxy-size lumps of matter form first and then merge to make more massive galaxies and clusters of galaxies.
(2) Pancake-like mass structures form first and grow until they collapse and fragment into galaxies.
(3) Galaxies form first the disk, then the bulge above the disk, and finally the halo high above the disk.
(4) Low-mass stars form first and then merge to form larger stars.
(5) Nuclei form first and then cpature the electrons to form the atoms.

11.- What parameters do you need to measure in order to use Cepheids as distance indicators?

(1) Period and luminosity
(2) Rotation and luminosity
(3) Color and luminosity
(4) Size and luminosity
(5) Composition and luminosity

8.- What are the three types of active galaxies?

(1) Seyfert galaxies, quasars, and radio galaxies
(2) Disk, bulge, and halo.
(3) Ellipticals, spirals, and irregulars
(4) Interacting galaxies, merging galaxies, and irregulars
(5) Blue galaxies, red galaxies, and radio galaxies

8.- What is the most likely source of energy in the core of active galaxies?

(1) A supermassive black hole
(2) A large group of Cepheids
(3) A supermassive stellar cluster
(4) A large amount of gas
(5) A large number of Supernovae

8.- What is the large scale structure?

(1) The distribution of galaxies and galaxy clusters over 100 Mpc scales
(2) The distribution of large dust clouds within the Galaxy
(3) The distribution of globular clusters around the galaxy
(4) The distribution of galaxies in the Local Group.
(5) The distribution of stars in the Galaxy bulge.

8.- What is the morphology of the galaxy image shown below?

(1) SBb
(2) E5
(3) Sa
(4) Sb
(5) Sc