O Levels Physics (5054)•5054/11/M/J/21

Explanation
Thermocouple Thermometer Characteristics
Steps:
- Recall that a thermocouple uses the Seebeck effect, where two dissimilar metals generate voltage from temperature differences.
- Determine temperature range: thermocouples handle up to 2000°C, suitable for very high temperatures.
- Assess response time: direct metal junction allows rapid heat conduction, enabling quick response to changes.
- Compare to options: only D affirms both properties.
Why D is correct:
- Thermocouples measure high temperatures via Seebeck effect (voltage proportional to ΔT) and respond quickly due to low thermal mass.
Why the others are wrong:
- A: Falsely denies both; thermocouples excel in high temperatures and fast response.
- B: Denies high-temperature capability, but they routinely measure up to 2000°C.
- C: Denies quick response, but their design ensures near-instantaneous detection.
Final answer: D
Topic: Physical quantities and measurement techniques
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