Discussion
Which of the following is highly sensitive transducer ?
Answer: D
The key names the thermistor as the highly sensitive transducer.
The passage defines sensitivity as the ratio of the change in output to the change in input. A thermistor's resistance changes by several percent for each degree Celsius (about -4 % per degree for a typical NTC type), which is far more than a thermocouple, whose output changes by only some tens of microvolts per degree. A potentiometer is a position transducer with a change per unit of travel set by its supply, and its output is not small-signal sensitive in the same way.
A photodiode is also very sensitive to light, which is why this item is a best-answer one; the key reads the question as being about temperature-type transducers, where the thermistor is the highly sensitive choice.
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