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 less 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 more than the number of electron-hole pairs lost per second due to recombination
Any of the above

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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

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

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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 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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