PrepTest 128, Section 4, Question 14
In the early 1900s, most astronomers mistakenly believed(458 more words not shown)
The passage provides enough information(8 more words not shown)
- ADoes the iron(10 more words not shown)
- BWho first proved(10 more words not shown)
- CDo any objects(12 more words not shown)
- DWhat percentage of(7 more words not shown)
- ECan the fusion(8 more words not shown)
Reading the passage
This asks what we have enough information to answer, not what we might know about astronomy. Be especially careful with the numbers: an old, rejected estimate isn't the actual iron percentage, and the hydrogen percentage doesn't tell us exactly how much iron remains.
Working the answers
- A
We learn that Earth contains iron, not whether iron makes up more than half its mass.
- B
No person is identified as the first to prove this. Einstein's equation contributed to the later understanding, but that doesn't answer who first proved that fusion generates the sun's heat.
- CCorrect
Yes: the second paragraph says that iron is present both on Earth and in every asteroid known at the time. The asteroids supply objects besides Earth and the sun.
- D
Sixty-six percent was the mistaken view. Ninety percent hydrogen, followed by mostly helium, doesn't give an exact percentage for iron among the remaining elements.
- E
We learn that hydrogen fusion produces energy. Whether fusion involving other kinds of atoms can do so isn't addressed.
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