According to the consensus among those scientists who have studied the question, what is the scientific status of the notion that Earth is now or was in the past visited by extraterrestrial life?
A) Although extraterrestrial life is theoretically plausible, and there is observational evidence for it, most scientists still will not accept the conclusion that we have been visited because it seems too unconventional or "kooky."
B) Extraterrestrial life is theoretically plausible, and there is real observational evidence for it, which is why most scientists believe that we have been visited.
C) Although there is no real evidence that Earth has been visited by extraterrestrials, extraterrestrial life is theoretically plausible.
D) Extraterrestrial life is implausible on general theoretical grounds, and there is no real evidence that Earth has been visited by extraterrestrials.
E) Although extraterrestrial life is implausible on general theoretical grounds, there is observational evidence for it.
C
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It is desired to project an image of an object four times actual size with a lens of focal length 20 cm. What object distance should be used?
A) 100 cm B) 80 cm C) 4 cm D) 25 cm E) 5 cm
Where would you expect to isolate molecules in a fractionating tower that have a large number of interatomic forces?
A) near the bottom B) near the top C) near the middle D) Fractional distillation takes advantage of molecular weight. E) Fractional distillation takes advantage of the number of isomers.
If two atoms appear in the same column of the periodic table they will
a. form similar compounds. b. have similar physical characteristics. c. have similar melting points. d. do all of the above. e. do only (a) and (c) above.