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

Resistivity of Ni remains the same
Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects
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

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Materials and Components
Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

In the same direction as current
None of these
In a direction anti parallel to magnetic field
Normal to both current and magnetic field

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

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