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Materials and Components

Materials and Components
The number of protons in a silicon atom are

4
14
8
12

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Materials and Components
A vacant electronic state moves in the same direction as would a positive charge carrier.

True
False

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Materials and Components
The materials which become polarized on the application of mechanical stress are called piezoelectric.

False
True

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Materials and Components
Electric dipole moment is expressed in debye unit.

True
False

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Materials and Components
Which of the following are true for relative dielectric constant?1. It is dimensionless.2. It is equal to 1 for vacuum.3. It is equal to 1 for all substances.

1, 2 and 3
2 and 3 only
1 and 2 only
1 and 3 only

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Materials and Components
The elements which become superconducting at extremely low temperatures are

Relatively poor conductors at room temperature
Insulators at room temperature
Good conductors at room temperature
Ferromagnetic at room temperature

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