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

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

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Materials and Components
An atom of a rare gas is placed is an electric field E. Then

The nucleus will be shifted in the direction of E by an amount which is proportional to E.
The nucleus will be shifted in a direction opposite to that of E.
The nucleus will be shifted in the direction of E by an amount which is independent of E.
The nucleus will not be shifted.

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Materials and Components
When a material is in superconducting state and a magnetic field is applied

The superconducting property is not affected
The superconducting property may be affected and resistivity may increase from zero to a low value
The material may become an insulator
The superconducting property may be destroyed

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

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
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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