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Standard XII
Physics
NCERT
Question

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).

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Solution
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(a) Alloys of metals usually have greater resistivity than that of their constituent metals.
(b) Alloys usually have much lower temperature coefficients of resistance than pure metals.
(c) The resistivity of the alloy manganin is nearly independent of increase of temperature.
(d) The resistivity of a typical insulator is greater than that of a metal by a factor of the order of 1022.

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Q1
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).
View Solution
Q2
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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Q3
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.
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Q4
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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Q5
The resistivity of alloys is usually
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