PT143.S2.P4.Q26

PrepTest 143 - Section 2 - Passage 4 - Question 26

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P1

To glass researchers it seems somewhat strange that many people throughout the world share the persistent belief that window glass flows slowly downward like a very viscous liquid. ████████ ██ █████████ ██████ ██ ███████ ████████ ███ ██████████ ███ ████ ███ █████ ████ ███████ ██ ███████ ██████ ███████ ██ ███ ███████ ███

Common belief · Glass flows downward like a liquid
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Origin of false belief · People misunderstand the fact that glass atoms aren't in a fixed structure
Because the atoms aren't fixed, people think that glass is like a liquid. By using "myth," the author indicates the common belief is false.
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Features of glass · Transition temperature
Cooled below the transition temperature, glass has physical properties of solid, even though it has non-fixed structure.
P2

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Debunking hypothesis about windows · People think stained glass windows are thicker at the bottom than the top because glass flows downward
Even though glass does very slightly flow downward, research shows this belief about stained glass windows is wrong.
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Study debunking hypothesis · Zanotto's research
It would take too long for the thicker bottoms of windows to result from glass flowing downward.
P3

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Elaborating on study · Although composition of windows can make glass flow faster, still not fast enough
P4

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Author's hypothesis · Thicker bottoms of glass are due to manufacturing methods
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Support for hypothesis · In 19th century, had to make glass in way that thickened the edges
People probably put thicker edges toward bottom for structural stability.
Passage Style
Critique or debate
Phenomenon-hypothesis (RC)
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26.

Which one of the following ██ ████ █████████ ██ ███ ██████████ ██████ █████ █████ █████████ ██ ███ ████████

a

Most people believe ████ ███ ████████ ██ ███████ ███████ ██ ██████ ████████ ██████ ██ █████████ ██████ ███ █████████████ ████████

Unsupported. We don’t know what most people believe about the manufacturing process of glass––we only hear what the author thinks about the manufacturing process (in P4). Because of this, a claim about what most people think about a manufacturing process isn’t analogous to the persistent popular belief about glass that is discussed in the passage.

6%
b

Most people believe ████ ███████ █████ ██ █████ ███████ ████ ██████ ██ ███ ████████ ████ ██████ ████ ███ ███████ ████ ██ █████████████ ███ ████████

The persistent belief in the passage is that something about glass as a material is what caused imperfections in windows. (B) is analogous because it illustrates an example of an object (pottery) with flaws that come from some property of the material rather than from the process of making the object.

79%
c

Most people believe ████ ██████████ █████████ ██ █████████████ ██████████ ████████ ███ ████ ████ ██ █████ ███████████

Unsupported. The passage doesn’t mention a persistent belief about something that shortened the lifespan of glass, so (C) isn’t analogous to the persistent belief mentioned in the passage.

4%
d

Most people believe ████ ██████ █████████ ████ ██ ██ ████████ ████ ██ ████████ ██ ████████████ ███████ ██████████

Unsupported. The persistent belief mentioned in the passage doesn’t compare mass produced glass with individually crafted glass, so (D) isn’t analogous to the persistent belief mentioned in the passage.

5%
e

Most people believe ████ ██████ █████████ ███ ████ ██ █████████ ███████████ ███████ ████ ███ ████ ████ ████ ███████ █████████ ████ ████ █████ ██████████

Unsupported. The persistent belief in the passage doesn’t compare the durability of modern glass and older glass, so (E) isn’t analogous to the persistent belief mentioned in the passage.

6%

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