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Engineering Materials in EE

Engineering Materials in EE
Cryogenics is a branch of science dealing with which of the following?

 Crystal growth.
 High temperature.
 Friction and wear.
  Low temperature.

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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
Magnetic recording tape is most commonly made from

 iron-dust.
 small particles of iron.
 silicon-iron.
 ferric-oxide.

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Engineering Materials in EE
Absolute permittivity of a dielectric medium is represented by

 εoεr.
 εr / εo.
 εo / εr.
None of these

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Engineering Materials in EE
Positive magnetostriction exists when

 dipoles are attract each other.
 none of above.
 dipoles are repel other.
 both are correct.

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Engineering Materials in EE
The magnetisation and applied field in ferromagnetic materials are related

 non linearly.
 linearly.
 parabolically.
 sinusoidally.

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