Discussion
A thermistor is used to measure the temperature. Following characteristics are given
1. They exhibit positive temperature coefficient and poor sensitivity.
2. They exhibit negative temperature coefficient for resistance.
3. Their resistance decreases with the increase in temperature.
4. They are made of oxides of semi conductors. Which one of the following is correct ?
Answer: C
The correct statements are 2, 3 and 4. A thermistor is a thermally sensitive resistor made of oxides of semiconductors, with a negative temperature coefficient: its resistance falls as the temperature rises, and it is highly sensitive.
Statement 1 says it has a positive temperature coefficient and poor sensitivity, which is the opposite of the facts for a typical thermistor, so it is false. That removes the options that include statement 1.
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