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Byju's Answer
Standard XII
Physics
Dependence of Resistance on Temperature
The thermisto...
Question

The thermistors are usually made of:

A
Metals with low temperature coefficient of resistivity.
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B
Metals with high temperature coefficient of resistivity.
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C
Metal oxides with high temperature coefficient of resistivity.
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D
Semiconducting materials having low temperature coefficient of resistivity.
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Solution

The correct option is D Metal oxides with high temperature coefficient of resistivity.
Thermistors are the resistors whose resistance decreases rapidly with the increase of temperature. This property is seen in the semiconductors. Metal oxides possess this property. Their temperature coefficient of resistivity is highly negative.

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Q. Consider the following statements A and B and identify the correct answer
A : Thermistors can have only -ve temperature coefficient of resistors.
B : Thermistors with -ve temperature coefficients of resistance are used as resistance thermometers to measure low temperature of the order of 10K
Q. Consider the following statements A and B and identify the correct answer :
A : Thermistors can have only negative temperature coefficients of resistances.
B : Thermistors with negative temperature coefficients of resistance are used as resistance thermometers, to measure low temperatures of the order of 10 K.
Q. Two metallic wires A and B of equal dimensions but made of different materials, having resistivities ρ and 2ρ, temperature coefficients of resistivities 2α and α are connected in series. The temperature coefficient of resistance of the composite wire equals:
Q.

Choose the correct alternative:

(a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals.

(b) Alloys usually have much (lower/higher) temperature coefficients of resistance than pure metals.

(c) The resistivity of the alloy manganin is nearly independent of/increases rapidly with increase of temperature.

(d) The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of (1022/103).

Q. Assertion :The temperature coefficient of resistance is always positive Reason: On increasing the temperature the resistance of metals and alloys increase
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