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Engineering Materials in EE

Engineering Materials in EE
Which of following material has least value of dielectric constant?

  Paper.
  Ceramics.
  Glass.
  Oil.

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Engineering Materials in EE
Susceptibility is negative for

 non magnetic substances.
 diamagnetic substances.
 ferromagnetic substances.
 none of above.

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Engineering Materials in EE
In Bohr’s model of atomic structure, the nucleus consists of

 protons.
 electrons.
 protons and neutrons.
 electrons and protons.

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Engineering Materials in EE
The intensity of magnetization, M, of a ferro magnetic solid

 decreases with increasing temperature.
 depends on method of heating.
 is independent of temperature.
 increases with increasing temperature.

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Engineering Materials in EE
Magnetic recording tape is most commonly made from

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

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Engineering Materials in EE
In ferromagnetic materials

 the constituent is only iron.
 the atomic magnetic moments are antiparallel and unequal.
 the atomic magnetic moments are parallel.
 one of the constituent is iron.

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