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Current Electricity question

2004 · Shift 0 · Q136
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Current Electricity question

2004 · Shift 0 · Q136

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
Thermistors are usually made of
  1. A
    metal oxides with high temperature coefficient of resistivity
  2. B
    metals with high temperature coefficient of resistivity
  3. C
    metals with low temperature coefficient of resistivity
  4. D
    semiconducting materials having low temperature
View written solutionFree

Correct answer: A

  1. What is a thermistor?
    A thermistor is a temperature-sensitive resistor whose resistance changes significantly with temperature.

  2. Material used for thermistors
    Thermistors are generally made from semiconducting materials, often in the form of metal oxides such as oxides of manganese, nickel, cobalt, copper, etc.

  3. Temperature coefficient
    Thermistors have a large temperature coefficient of resistivity (usually negative for common thermistors, i.e. resistance decreases rapidly with increase in temperature).

  4. Check the options

    • A: metal oxides with high temperature coefficient of resistivity
      This matches the usual construction of thermistors. ✅
    • B: metals with high temperature coefficient of resistivity
      Metals are used in ordinary resistance thermometers, not thermistors. ❌
    • C: metals with low temperature coefficient of resistivity
      Not correct for thermistors. ❌
    • D: semiconducting materials having low temperature
      This statement is incomplete/incorrect; thermistors are semiconductors with high temperature sensitivity, not "having low temperature." ❌

  5. Final answer
    Therefore, the correct option is: A\boxed{\text{A}}A​

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