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

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

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

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

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

Any of the above
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
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

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