Exam 1 Sample - Multiple Choice Answers - Astro 250 1- a 13- c 2- d 14- b 3- c 15- c 4- d 16- b 5- a 17- b 6- a 18- d 7- a 19- a 8- d 20- a (or c) 9- b 21- c 10- c 22- d 11- c 23- c 12- b