mt2-sample-mc - Sample MidTerm #2 Covers Chs.14-18 Name_...

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Sample MidTerm #2 Covers Chs.14 - 18 Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What is the Sun made of? A) 98 percent hydrogen, 2 percent helium and other elements B) 50 percent hydrogen, 25 percent helium, 25 percent other elements C) 100 percent hydrogen and helium D) 70 percent helium, 28 percent hydrogen, 2 percent other elements E) 70 percent hydrogen, 28 percent helium, 2 percent other elements 1) 2) Using groud - based telescop;es, the most distant stars we can measure stellar parallax for are approximately A) 100 parsecs away. B) 5 parsecs away. C) 10,000 parsecs away. D) in the Andromeda Galaxy. E) halfway across the Milky Way Galaxy. 2) 3) Which of the following statements comparing open and globular star clusters is not true? A) Stars in open clusters are relatively young while stars in globular clusters are very old. B) For both open and globular clusters, we can assume that all the stars in a particular cluster are about the same age. C) Open clusters are found only in the disk of the galaxy while globular clusters may be found both in the disk and the halo of the galaxy. D) Open and globular clusters each typically contain a few hundred stars. 3) 4) What happens when a star exhausts its core hydrogen supply? A) It contracts, becoming hotter and brighter. B) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness. C) It expands, becoming bigger but dimmer. D) It contracts, becoming smaller and dimmer. E) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. 4) 5) What is a protostar ? A) a star that has planets B) a star that is still in the process of forming C) a star in its ±nal stage of life D) an intermediate - mass star 5) 1
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6) What kind of star is most likely to become a white - dwarf supernova? A) a white dwarf star with a red giant binary companion B) a star like our Sun C) a binary M star D) a pulsar E) an O star 6) 7) From the center outward, which of the following lists the "layers" of the Sun in the correct order? A) core, corona, radiation zone, convection zone, photosphere, chromosphere B) core, convection zone, radiation zone, photosphere, chromosphere, corona C) core, convection zone, radiation zone, corona, chromosphere, photosphere D) core, radiation zone, convection zone, photosphere, chromosphere, corona E) core, radiation zone, convection zone, corona, chromosphere, photosphere 7) 8) When is/was gravitational contraction an important
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This note was uploaded on 02/01/2012 for the course PHYS 133 taught by Professor Staff during the Fall '08 term at University of Delaware.

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mt2-sample-mc - Sample MidTerm #2 Covers Chs.14-18 Name_...

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