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28 Which of the following instruments can be used to analyze celestial objects in the UV part of the spectrum (a) A radar telescope (b) A spectrophotometer (c) An interferometer (d) A Keplerian refractor (e) A Galilean refractor 29 Most telescope eyepieces have focal lengths ranging from approximately (a) 04 to 4 mm (b) 4 to 40 mm (c) 40 to 400 mm (d) 40 cm to 4 m (e) 4 to 40 m 30 A Cassegrain reflector (a) has a concave objective mirror and a flat secondary mirror (b) has a concave objective mirror and a convex secondary mirror (c) has a longer tube than an equivalent Newtonian reflector (d) suffers from lens sag if the diameter of the objective is too large (e) has the eyepiece mounted in the side of the tube 31 Fill in the blank to make the following sentence correct: For best viewing, the ________ of a pair of binoculars should be the same as the diameter of the pupils of the observer s eyes when adjusted to the darkness (a) objective-lens diameter (b) eyepiece diameter (c) magnification (d) exit pupil (e) focal length 32 One theory concerning the nature of x-ray stars suggests that they consist of (a) diffuse gas and dust congealing into new stars (b) remnants of supernovae (c) binary systems in which a neutron star pulls matter from a normal star (d) cool stars with intense magnetic fields (e) pairs of neutron stars in mutual orbit 33 In an interplanetary or intergalactic spacecraft, the oxygen supply can be supplemented by (a) burning flammable materials (b) electrolysis of water (c) combining water with hydrogen (d) hydrogen fusion (e) none of the above
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34 A Cassegrain reflector has an objective measuring 25 cm in diameter The magnification of the telescope is 250 What is the f-ratio of this instrument (a) f/25 (b) f/250 (c) f/10 (d) f/010 (e) It cannot be calculated from this information 35 Which, if any, of the following (a, b, c, or d) has not been suggested as a good reason for humanity to venture into space (a) Extraterrestrial objects contain natural resources we can use (b) We should strive to encounter and learn from extraterrestrial beings (c) Relativistic space travel will allow us to travel back in time and correct our past mistakes (d) The Sun will eventually die and we will need to find a new home (e) All of the above have been suggested as good reasons for humanity to venture into space 36 Radar astronomy has proven valuable in mapping the surface of (a) Neptune (b) Uranus (c) Saturn (d) Jupiter (e) Venus 37 The Bussard ramjet is a proposed form of (a) aircraft propulsion system (b) hydrogen-fusion propulsion system (c) chemical propulsion system (d) matter-antimatter propulsion system (e) laser-beam propulsion system 38 When light from the Sun shines on a spherical, reflective object such as a steel ball bearing, the reflected rays (a) are all parallel (b) diverge (c) converge (d) focus to a point hot enough to start fires (e) behave unpredictably 39 When an astronaut lives for a long time at zero-g, (a) the body becomes stronger because it doesn t have to constantly work against the pull of gravity (b) the bones lose calcium, which is excreted in the urine; this weakens the skeleton and can cause kidney stones (c) the lung capacity increases because the thin air requires that they grow larger to get enough oxygen
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(d) the body gradually loses its need for sleep so that by the end of a long journey, space travelers can stay awake and alert indefinitely (e) nothing in particular happens to the body 40 Karl Jansky was the first experimenter to discover radio noise coming from outer space He found especially high levels of rf energy when his antennas were aimed at (a) the Moon (b) the north celestial pole (c) the center of the galaxy (d) the horizon (e) the zenith
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