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Standard X
Physics
Resistivity
The resistivi...
Question

The resistivity of alloys is usually

A
more than its constituents
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B
less than its constituents
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C
equal to its constituents
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D
none of these
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Solution

The correct option is A more than its constituents
Alloys have larger resistivity than its constituent elements. Alloys are so manufactured that they do not allow the flow of electrons through them. Resistivity of alloys decreases as the temperature increases.

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Q. The resistivity of alloys is ______ than its constituent elements.
Q. Statement 1: Nichrome is used to make the surface of the electric iron because it oxidises easily at high temperatures.

Statement 2: Electrical heating elements are made up of an alloy rather than a pure metal because the resistivity of an alloy is higher than the pure metal.

Which of the following statement is true?
Q. Which combination of statements is correct?
i. If electrical resistivity of metal X is lower than that of metal Y, it means metal X is better conductor of electricity than metal Y.
ii. If a wire of resistance 8Ω is doubled on itself, the resistance of the new wire will be 2Ω.
iii. The coils of electric toasters and irons are made of an alloy rather than a pure metal because resistivity of the alloy is higher than that of its constituent metals.
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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. Choose the correct alternative: (a) Alloys of metals usually have (greater/less) resistivity than thatof their constituent metals. (b) Alloys usually have much (lower/higher) temperaturecoefficients 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 thanthat of a metal by a factor of the order of (1022/1023).
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