Question

1. Rotational velocity outside the visible boundary of our galaxy is _____ than would be expected on the basis of observed stars and gas, indicating the presence of ______.
(A) Zero; vaccum
(B) Lower; Gas
(C) Smaller; White dwarfs
(D) Higher; Dark matter
2. Which of the following may explain the failure to observe population III stars?
(A) We don't expect to observe population III stars, because pure hydrogen and helium stars never formed.
(B) Population III stars had their surfaces contaminated by remnants of massive stars.
(C) The stars to be formed in the Milky Way were very massive and therefore short-lived.
(D) All of the above
(E) Only (B) and (C) above
3. The _________ theory offers a likely explanation for the formation of ________.
(A) High rotation speed; spiral arms
(B) Density wave; galactic bulge
(C) Density wave; spiral arms
(D) Density wave; dark matter
4. Dust and gas in the Milky Way
(A) Are spread evenly through halo and disk.
(B) Are concentrated in a thin layer in the disk.
(C) Are found in different places: Dust and primarily in the disk and gas in the primarily in the halo.
(D) Are found in different places: gas primarily in the disk and dust primarily in the halo.
5. According to the wave density theory, spiral arms are blue because
(A) contain many reflection nebulae from sites of younger star formation
(B) Contain only young stars, whose formation was triggered by the explosion of older red stars just in front of the spiral arms
(C) Contain a lot of young stars formed from the clouds compressed by the density wave.
(D) Have too much metal content to form red stars.
6. Sir William Herschel counted the no. of stars in different directions, and getting similar numbers in each direction along the disk, concluded the sun was near the center of a disk-like collection of stars. Herschel came to the wrong conclusion about the sun's location because
(A) He was predisposed to believe that the Sun was in the center of the Milky Way
(B) He didn't know that the interstellar dust made it hard for him to see a large part of the Milky Way's disk.
(C) He only counted globular stars, and not regular stars.
(D) The Sun's position in the Milky Way at that particular time was very unusual and skewed his results.
7. Which statement is true about open clusters?
(A) After a molecular cloud has collapsed and formed many stars, the cloud dissipates and the stars spread out into an open cluster.
(B) Open clusters usually contain many blue stars.
(C) Open clusters are gravitationally bound and therefore have a spherical shape.
(D) Open clusters typically contain dozens to hundreds of stars.
8. Why is it not possible to use visible light to investigate the center of our galaxy?
(A) Intervening gas locating in the disk of the Galaxy blocks our view of the galactic center.
(B) The massive Black Hole located at the center of our Galaxy prevents light from escaping the region.
(C) There are no sources of visible light found at the center of the galaxy.
(D) The density of stars towards the galactic center is so high that it is not possible to see through them.
9. One difference between population I and population II stars in the Milky Way is
(A) That population I stars produce energy by fusion and population II by fission.
(B) That population I stars have very few metals and Population II stars have orbits that pass through the disk.
(C) That population I stars have orbits in the disk and population II stars have orbits that pass through the disk.
(D)That population I stars produce energy by fusion and population II stars through gravitational contraction.
10. In a telescopic observation of a field stars, you see an irregularly shaped dark patch. This is most likely to be
(A) An area where there are no stars.
(B) A Black Hole.
(C) The dusty center of a globular cluster.
(D) A dark nebula.
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Answer 1

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