MATERIALS AND COMPONENTS QUIZ

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

Matthiessen’s rule

Curie rule

Onne’s rule

Debye rule

TRUE ANSWER : ?
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Wood is a diamagnetic material.

True

False

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Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.

True

False

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Many compounds also exhibit semiconducting properties.

True

False

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Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

In the same direction as current

None of these

Normal to both current and magnetic field

In a direction anti parallel to magnetic field

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As the viscosity of a liquid increases, the relaxation time

First decreases then increases

Increases

Remains constant

Decreases

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Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called

Debye temperature

Neel temperature

Transition temperature

Curie temperature

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The merger of hole and free electron is called

Free electrons

Covalent bonding

Recombination

Thermal energy

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The elements which become superconducting at extremely low temperatures are

Relatively poor conductors at room temperature

Ferromagnetic at room temperature

Good conductors at room temperature

Insulators at room temperature

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Which inductor is used at high frequencies?

Sheet steel cored

Cast iron cored

Iron alloy cored

Ceramic cored

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