ASTRO 207 Midterm 2 Exam - Questions with 100% Correct Answers How much electrical charge does an atom with 6 protons, 6 neutrons, and 5 electrons have? A) a positive charge of +1 B) a total charge of +17 C) a positive charge of +7 D) a negative charge of -5 E) none of the above Suppose the angul...
ASTRO 207 Midterm 2 Exam How much electrical charge does an atom with 6 protons, 6 neutrons, and 5 electrons have? A) a positive charge of +1 B) a total charge of +17 C) a positive charge of +7 D) a negative charge of -5 E) none of the above Suppose the angular separation of two stars is smaller than the angular resolution of your eyes. How will the stars appear to your eyes? A) you will not be able to see these two stars at all B) you will see two distinct stars C) the two stars will appear to be to uching, looking rather like a small dumbbell D) the two stars will look like a single point of light E) you will see only the larger of the two stars, not the smaller one In which of the following cases would you feel weightless? A) while walking on the Moon B) while falling from a roof C) while falling from an airplane with your parachute open D) while traveling through space in an accelerating rocket E) none of the above Which of the following is not an advantage of spacecraft flybys over ground -based telescope observations? A) spacecraft can measure local magnetic fields B) spacecraft can monitor changed in a planet's atmosphere over long times C) spacecraft can make highly detailed imaged of the planet and its moons D) spacecraft can sample the gravitational field of a planet E) spacecraft can view "backlit" views of planetary rings Which of the following observations indicates that conditions on Mars may have been suitable for life in the past? A) There are very large extinct volcanoes on Mars B) Mas has polar caps made of "dry ice" C) Mars has two small moons D) there is a very deep and long canyon that extends across Mars E) there is liquid water as well as a significant number of dried -up riverbeds on Mars When light reflects off an object, what is the relation between the angle of incidence and the angle of reflection? A) angle of incidence + angle of reflection= 180 degrees B) angle of incidence + angle of reflection= 90 degrees C) angle of incidence= angle of reflection D) angle of incid ence - angle of reflection= 90 degrees E) it depends on the material that light reflects off What do astronomers mean by light pollution? A) light pollution refers to light used for human activities that brightens the sky and hinders astronomical observat ions B) light pollution refers to harmful gases emitted by common street lights C) light pollution refers to the lights that must be used inside major observatories and that make it difficult for astronomers' eyes to adapt to darkness D) light pollution is another name for sunlight, which makes it impossible to see stars in the daytime E) light pollution refers to pollution caused by light industry as opposed to heavy industry Which of the following statements correctly describes the law of conservation of energy? A) an object always has the same amount of energy B) the total quantity of energy in the universe never changes C) energy can change between many different forms, such as potential, kinetic, and thermal, but it is ultimately destroyed D) the fact that you can fuse hydrogen into helium to produce energy means that helium can be turned into hydrogen to produce energy E) it is not really possible for an object to gain or lose potential energy, because energy cannot be destroyed Which of the followin g statements about electrical charge is true? A) a positive charge and a negative charge will attract each other B) two positive charges will attract each other C) two negative charges will attract each other D) a positive charge and a negative charge wil l repel each other Which planet, other than Earth, has visible what ice on it? A) Mars
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