Materials and Components
The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as

Debye rule
Onne’s rule
Matthiessen’s rule
Curie rule

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Materials and Components
If a small amount of Cu is added to Ni conductor, then

Residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres
Resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni
Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects
Resistivity of Ni remains the same

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Materials and Components
In an intrinsic semiconductor, at a given temperature T

The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination
The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
Any of the above
The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination

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