MATERIALS AND COMPONENTS QUIZ

In an intrinsic semiconductor, at a given temperature T

The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination

The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination

Any of the above

The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination

TRUE ANSWER : ?
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In van der walls crystals, there exists a high degree of stability of the outer electron shell.

False

True

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Which inductor is linear?

Sheet steel cored

Iron alloy cored

Air cored

Cast iron cored

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Electric dipole moment is expressed in debye unit.

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

Normal to both current and magnetic field

In a direction anti parallel to magnetic field

None of these

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On the basis of the type of chemical bonds, solids may be classified into

Ionic and valence crystals

Ionic crystals, valence crystals, metal and vander wall crystals

Ionic crystal, valence crystals and metals

Ionic crystals

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At room temperature the number of conducting electrons in an intrinsic semiconductor

Is about half the number of valence electrons

Is small as compared to the number of valence electrons

Is a very small fraction of the number of valence electrons

Is almost equal to the number of valence electrons

TRUE ANSWER : ?
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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

Curie rule

Matthiessen’s rule

Onne’s rule

Debye rule

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The most important set of specifications of transformer oil include

dielectric strength and flash point

viscosity and flash point

dielectric strength and viscosity

flash point and viscosity

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A characteristic property of crystal is its periodicity of structure.

True

False

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YOUR ANSWER : ?

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