MATERIALS AND COMPONENTS QUIZ

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

Normal to both current and magnetic field

In a direction anti parallel to magnetic field

In the same direction as current

None of these

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The number of protons in a silicon atom are

14

4

12

8

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

Matthiessen’s rule

Onne’s rule

Curie rule

Debye rule

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

False

True

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

False

True

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Which inductor is used at high frequencies?

Sheet steel cored

Iron alloy cored

Cast iron cored

Ceramic cored

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Debye temperature of metals is

About 200 K

About 10 K

About 600 K

About 2 K

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When a material is in superconducting state and a magnetic field is applied

The superconducting property may be destroyed

The superconducting property is not affected

The material may become an insulator

The superconducting property may be affected and resistivity may increase from zero to a low value

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Schrodinger wave equation is a

Differential equation

None of these

Linear equation

Partial differential equation

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The merger of hole and free electron is called

Covalent bonding

Recombination

Thermal energy

Free electrons

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