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Engineering Materials in EE

Engineering Materials in EE
________ is the most detrimental impurity in the magnetic materials

 Nitrogen.
 Oxygen.
 Sulphur.
 Carbon.

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Engineering Materials in EE
When will be the electron pair bonding occurs ?

 Lack holes
 Share holes
None of these
 Share electrons

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Engineering Materials in EE
Two different isotopes of an element have different

 atomic number.
 numbers of protons.
 numbers of electrons.
 numbers of neutrons.

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Engineering Materials in EE
Why diamond is very hard ?

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

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Engineering Materials in EE
According to the Bohr model, an electron gains or losses energy only by

 jumping from one allowed orbit to another.
 jumping from one atom to another atom.
 moving faster or slower in an allowed orbit.
 being completely removed from an atom.

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Engineering Materials in EE
Which of the following gives materials in order of decreasing values of permeability?

 Silver, copper, aluminium, iron.
 Pure iron, silicon iron, aluminium, bismuth.
 Cobalt, nickel, aluminium, iron.
  Permalloy, nickel, air, water.

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