Engineering Materials in EE
Why diamond is very hard ?

 Because of large cohesive energy
 Because of covalent solid
None of these
 Because of high melting point

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Engineering Materials in EE
The Bohr model of the atom

 explained the color lines in the hydrogen spectrum.
 had some made-up rules without explanations.
All of these
 could not explain the line spectrum of atoms larger than hydrogen.

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Engineering Materials in EE
Which statement is not true of ferromagnetic materials.

 They lose their nonlinearly property above the Curie temperature.
  They have fixed value of μr.
 Energy loss is proportional to the area of hysteresis loop.
 They have large magnetic susceptibility.

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