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Byju's Answer
Standard X
Physics
Resistivity
The resistivi...
Question

The resistivity of alloys is ______ than its constituent elements.

A
higher
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B
lower
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C
same
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D
none of these
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Solution

The correct option is A higher
Metal alloy has greater resistivity than the corresponding metals because of lattice distortion from the alloying elements. A metal with no alloying elements would transport electron by drift oscillation over the lattice.
Difference in atomic radii of alloying elements and in electronegativity from base metal, the presence of alloying element changes locally electronic structure of base metal. Such change modulates the typical drift oscillation mechanism in electron conduction by scattering and leads to higher resistance.

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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).
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.
iv. If a conductor of length 65 cm has a resistance of 4Ω, the same conductor of length 260 cm will have the resistance of 16Ω.
v. The maximum amount of current that can pass through a conductor is 440 A.
Q.

Identify the alloy containing a non-metal as a constituent in it


Q. Alloys are homogeneous mixture of a metal with a metal or nonmetal. Which among the following alloys contain non-metal as one of its constituents?
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