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Engineering Materials in EE

Engineering Materials in EE
Almost the entire mass of an atom is concentrated in the

 electrons.
 neutrons.
 protons.
 nucleus.

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Engineering Materials in EE
The numberof atoms per unit cell in a B.C.C structure is

 4.
 7.
 12.
 2.

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Engineering Materials in EE
When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as

 magnetostriction.
 magnetic expansion.
 magneto-calorisation.
 magnetic hysteresis.

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

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

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

 Lack holes
None of these
 Share electrons
 Share holes

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Engineering Materials in EE
The number of rings in the Bohr model of any element is determined by what?

 Row number on periodic table.
 Column number on periodic table.
 Atomic number.
 Atomic mass.

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