Materials and Components
With increase in temperature, the electrical conductivity would

Decrease in metals as well as in intrinsic semiconductor
Increase in metals as well as in intrinsic semiconductor
Increase in metals but decrease in intrinsic semiconductor
Decrease in metals but increase in intrinsic semiconductor

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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 more than 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
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
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
None of these
In a direction anti parallel to magnetic field
In the same direction as current

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Materials and Components
At room temperature the number of conducting electrons in an intrinsic semiconductor

Is about half the number of valence electrons
Is small as compared to the number of valence electrons
Is a very small fraction of the number of valence electrons
Is almost equal to the number of valence electrons

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