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# mt2A - Astronomy 10 Fall 2008 Midterm 2 This test has 40...

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Astronomy 10 - Fall 2008 Midterm 2 November 13, 2008 This test has 40 multiple-choice questions. You need Scantron form 882-E to take it. You are allowed to use a calculator and one page (double-sided) of written notes. All other materials and references should be put away. Note the list of equations and physical quantities attached to the back of this test. Be sure to write your full name , SID , and section number on your Scantron form. 1. THIS EXAM IS VERSION A. PLEASE ANSWER A TO QUESTION 1. 2. Astronomers can use the parallax of a star to obtain its distance. What is the parallax? (a) the angular distance between the star and the celestial equator (b) the angular shift of the star due to the Earth’s orbital motion (c) the angular distance of the star above or below the ecliptic (d) the apparent angular size of the star on the sky 3. What force principally balances self-gravity in the Sun? (a) the centrifugal force caused by solar rotation (b) the force of the Sun’s internal magnetic field (c) the upward motion associated with convection (d) the outward push of gas pressure 1

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4. Consider a brown dwarf and a white dwarf that have both cooled to a very low temperature. Which is bigger? (a) the brown dwarf (b) the white dwarf (c) They have the same size. (d) There is not enough information to tell. 5. Consider a binary system so far away that you cannot resolve the separation of the individual stars. You know with certainty, however, that you are observing a binary, and that one star has twice the mass of the other. What piece of information, by itself, can tell you this? 6. Which of the following statements about novae is true?
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mt2A - Astronomy 10 Fall 2008 Midterm 2 This test has 40...

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