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Materials and Components

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

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Materials and Components
The resistance of a photoconductor

May increase or decrease with increase in light intensity
Remains constant
Decreases with increase in light intensity
Increases with increase in light intensity

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Materials and Components
Nickel is a non-magnetic material.

False
True

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Materials and Components
The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as

Onne’s rule
Debye rule
Matthiessen’s rule
Curie rule

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Materials and Components
Debye temperature of metals is

About 600 K
About 200 K
About 2 K
About 10 K

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