PHYS 284 FINAL exam questions with answers

PHYS 284 FINAL exam questions with
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answers

1) The earliest evidence for life on Earth dates to
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A) about 4.5 billion years ago.
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B) about 3.8 billion years ago.
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C) about 2 billion years ago.
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D) about 570 million years ago.
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E) about 65 million years ago. - CORRECT ANSWERS ✔✔B)
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about 3.8 billion years ago.
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1) Why do jovian planets bulge around the equator, that
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is, have a "squashed" appearance?
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A) They are much more massive than the terrestrial
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planets. |\

,B) Their large systems of moons and rings gravitationally
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attract the mass around the equator more.
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C) Their rapid rotation flings the mass near the equator
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outward. |\




D) Their internal heat sources exert a pressure against
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the sides of the planets.
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E) all of the above - CORRECT ANSWERS ✔✔C) Their rapid
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rotation flings the mass near the equator outward.
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1) Approximately, what basic composition are all stars
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born with? |\




A) half hydrogen, half helium, no more than 2 percent
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heavier elements |\ |\




B) three-quarters hydrogen, one-quarter helium, no more
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than 2 percent heavier elements
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C) 90 percent hydrogen, 10 percent helium, no more than
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1 percent heavier elements
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,D) one-quarter hydrogen, three-quarters helium, no more
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than 2 percent heavier elements
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E) 98 percent hydrogen, 2 percent helium - CORRECT
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ANSWERS ✔✔B) three-quarters hydrogen, one-quarter
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helium, no more than 2 percent heavier elements
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2) How much energy does Jupiter emit compared with
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how much it receives from the Sun?
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A) It emits 10 times as much.
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B) It emits twice as much.
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C) It emits half as much.
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D) It emits 10 percent as much.
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E) It emits 1 percent as much. - CORRECT ANSWERS
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✔✔C) It emits half as much.
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1) What is the meaning of the word cosmos?
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A) the origin of Earth and life upon it
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B) the light from a distant astronomical object
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, C) the Milky Way
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D) the sum total of all matter and energy, that is,
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everything within and between all galaxies |\ |\ |\ |\ |\ |\




E) the dark sky - CORRECT ANSWERS ✔✔D) the sum total
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of all matter and energy, that is, everything within and
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between all galaxies |\ |\




1) How many stars can you see with your naked eye on a
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clear, moonless night from a dark location?
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A) fewer than a thousand
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B) a few thousand
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C) about ten thousand
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D) about a hundred thousand
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E) more than you could count in your lifetime - CORRECT
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ANSWERS ✔✔B) a few thousand |\ |\ |\ |\




1) People of central Africa predicted the weather by
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A) recording the seasonal changes in average
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temperature. |\




B) observing the path of the planets across the sky.
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