PrepTest 143, Section 2, Question 24
To glass researchers it seems somewhat strange that(470 more words not shown)
The passage suggests that the(9 more words not shown)
- Abehave as a(9 more words not shown)
- Bbe noticeably deformed(14 more words not shown)
- Cbehave as a(10 more words not shown)
- Dflow downward under(12 more words not shown)
- Estop flowing only(10 more words not shown)
Reading the passage
Atomic arrangement and physical behavior are not the same thing here. Glass remains amorphous when cooled into a solid. Heating it into its transition range changes how it behaves without requiring us to imagine a fixed crystal structure being established first.
What we’re looking for
That lets us distinguish glass sitting in an ordinary window from glass heated enough to flow. The first paragraph explains the change of state; the later discussion connects heating with an appreciable ability to flow.
Working the answers
- A
This repeats the confusion the author corrects. Similar atomic structure does not mean glass continues behaving as a liquid after taking on solid properties.
- B
A few millennia means a few thousand years. The calculated time for a noticeable change in these windows is enormously longer, so this does not follow from the possibility of slight flow.
- C
The author locates solid physical properties below the lower end of the transition range. The range is where glass changes behavior, not a reason to expect it to remain behaving as a solid throughout the heating process.
- DCorrect
Heating glass to its transition range gives it the flowing behavior associated with its liquid state, so gravity can draw it downward. This combines the first paragraph's transition description with the later point that appreciable flow requires substantial heating. It does not describe an unheated old window.
- E
A fixed crystal structure is not required for solid behavior. Cooled glass retains an amorphous structure while taking on solid properties, directly undermining this proposed requirement.
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