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Difficulty: MediumDirect Fact Retrieval

Expendable bathythermograph (XBT) probes are deployed from survey vessels to record water temperature profiles at varying ocean depths. As the probe descends through the water column at a known terminal velocity, a fine copper wire unspools from both the probe and the onboard launcher to transmit continuous resistance readings. Inside the streamlined zinc nose cone, a precision thermistor detects minute temperature fluctuations. The recording system converts the measured electrical resistance directly into temperature values, pairing each reading with an elapsed-time calculation to determine exact depth without requiring an active acoustic transmitter.

According to the passage, which component detects temperature fluctuations inside the probe?

  1. A
    A fine copper wire
  2. B
    An active acoustic transmitter
  3. A precision thermistorAnswer
  4. D
    An elapsed-time calculation unit

Answer

A precision thermistor
The passage directly states that 'Inside the streamlined zinc nose cone, a precision thermistor detects minute temperature fluctuations.' Therefore, the precision thermistor is the exact component responsible for detecting temperature.

Step-by-Step Solution

1
Scan the passage for key terms related to temperature detection
Identified the sentence: 'Inside the streamlined zinc nose cone, a precision thermistor detects minute temperature fluctuations.'
Direct fact retrieval requires locating the exact sentence that matches the question stem's target action.
2
Extract the specific component identified as performing the detection
The precision thermistor is the component explicitly credited with detecting temperature fluctuations.
Matching the explicit subject to the stated function confirms the correct fact without relying on inference.

Key Concept

Direct Fact Retrieval
Estimated Time:1m 0s
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Topics

Direct Fact Retrieval

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