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Difficulty: EasyDirect Fact Retrieval

Night vision goggles (NVGs) require specific cleaning protocols to preserve optical coating integrity. Technicians must first use a soft camel-hair brush to gently dislodge abrasive dust particles from the objective lens. After brushing, the optical surface is wiped using lens tissue moistened with isopropyl alcohol. Applying liquid cleaner directly onto the optical housing is strictly forbidden, as fluid can seep past internal rubber O-rings and cause internal moisture fogging. Clean lenses ensure clear target recognition during night operations.

According to the passage, why is applying liquid cleaner directly onto the optical housing forbidden?

  1. A
    It dislodges abrasive dust particles across the objective lens
  2. Fluid can seep past rubber O-rings and cause internal foggingAnswer
  3. C
    It moistens the lens tissue prior to wiping the optical surface
  4. D
    Alcohol reacts chemically with ambient nitrogen to degrade the outer frame

Answer

Fluid can seep past rubber O-rings and cause internal fogging
The correct answer directly restates the explicit reason provided in the passage: liquid cleaner applied directly onto the housing can seep past internal rubber O-rings and cause internal moisture fogging.

Step-by-Step Solution

1
Scan the passage for the phrase 'strictly forbidden' or 'liquid cleaner directly'.
Located the sentence: 'Applying liquid cleaner directly onto the optical housing is strictly forbidden, as fluid can seep past internal rubber O-rings and cause internal moisture fogging.'
Direct fact retrieval requires locating the specific keyword phrase within the text.
2
Identify the cause following the indicator word 'as'.
The stated cause is that fluid seeps past internal rubber O-rings and causes internal moisture fogging.
The word 'as' directly provides the factual reason for the prohibition.

Key Concept

Direct Fact Retrieval
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Direct Fact Retrieval

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