Materials and Components
Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called

Curie temperature
Neel temperature
Debye temperature
Transition temperature

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

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

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Materials and Components
The residual resistivity of a binary alloy at 0 K is

Product of residual resistivities of component metals
Difference of residual resistivities of component metals
Dependent on the concentration of minor component in the alloy
Sum of residual resistivities of component metals

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