The GATE Grind

GATE 2021 BM – Question 20

Sensors and Bioinstrumentation · Sensors and Signal Conditioning · 1 mark · Multiple choice

Which temperature sensor is used in contact-type digital thermometers for measuring body temperature?

  1. Thermocouple
  2. Thermistor
  3. Resistance temperature detector
  4. Infrared LED–photodetector pair

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Correct answer: (B) Thermistor

Explanation

A thermistor provides a strong, predictable resistance change over the body-temperature range and is commonly used in contact digital clinical thermometers. Thus B. Infrared detection instead supports noncontact optical temperature measurement rather than the contact sensing described here.

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