Materials and Components
Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called

Curie temperature
Transition temperature
Debye temperature
Neel temperature

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

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

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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 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
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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Materials and Components
If a small amount of Cu is added to Ni conductor, then

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 remains the same
Resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni

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