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Question

Difficulty: HardRecognizing Implied Cause and Effect

Technicians at an optical manufacturing facility polished high-grade quartz lenses using a cerium oxide slurry chilled to sixty degrees Fahrenheit. During an extended production run, the refrigeration unit cycling rate slowed, and the slurry temperature climbed steadily throughout the afternoon. Operators noted an increase in surface friction across the polishing pads. Final inspection at the end of the shift revealed that all finished lenses exhibited perimeter micro-fractures.

Based on the passage, what most likely led to the structural damage on the finished lenses?

  1. A
    The development of perimeter micro-fractures produced elevated friction against the polishing pads.
  2. B
    The cerium oxide slurry was continuously chilled to sixty degrees Fahrenheit throughout the entire run.
  3. Inadequate slurry cooling allowed excessive friction and thermal stress to build during the polishing process.Answer
  4. D
    Technicians mixed an incorrect chemical concentration of cerium oxide before the shift began.

Answer

Inadequate slurry cooling allowed excessive friction and thermal stress to build during the polishing process.
The passage establishes that the refrigeration system slowed down, which allowed the slurry to warm up and caused friction between the lenses and polishing pads to rise. This sequence of events directly implies that the failure to keep the slurry cool led to high friction and thermal stress, which resulted in the perimeter micro-fractures found during final inspection.

Step-by-Step Solution

1
Analyze the sequential premises presented in the text.
Identified that the refrigeration cycling slowed, the slurry temperature rose, friction on polishing pads increased, and lenses developed micro-fractures.
Tracking the timeline of events reveals the unstated causal progression connecting system behavior to the final defect.
2
Deduce the unstated causal bridge between the cooling failure and lens fractures.
The breakdown in refrigeration permitted heat and pad friction to intensify on the quartz surfaces during polishing, causing thermal fracture.
The author presents these facts consecutively to imply a direct chain of cause and effect without using explicit conjunctions.
3
Evaluate the choices against the deduced implied cause.
The option highlighting inadequate slurry cooling and resulting friction/thermal buildup matches the logical conclusion.
Eliminating reversed causes, verbatim traps, and unsupported assumptions isolates the single valid deduction.

Key Concept

Recognizing unstated causal links between environmental conditions and material outcomes in technical passages.
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Topics

Recognizing Implied Cause and Effect

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