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Engineering Materials in EE

Engineering Materials in EE
How many classes of insulating materials are there?

 7.
 5.
 6.
 8.

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

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

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Engineering Materials in EE
Permittivity of free space is equal to

 8.854 × 10 - 12 F / m.
 8.854 × 10 - 10 F / m.
 8.854 × 10 - 11 F / m.
 8.854 × 10 - 13 F / m.

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

 Share electrons
None of these
 Share holes
 Lack holes

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Engineering Materials in EE
Why diamond is very hard ?

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

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

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

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