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

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Materials and Components
Electrical contact materials used in switches, brushes, relay must possess

High thermal conductivity and high melting point
Low thermal conductivity and high melting point
High thermal conductivity and low melting point
Low thermal conductivity and low melting pointL

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

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