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 remains the same
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

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

Any of the above
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 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
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

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