MATERIALS AND COMPONENTS QUIZ

Electrical contact materials used in switches, brushes, relay must possess

High thermal conductivity and low melting point

Low thermal conductivity and low melting pointL

High thermal conductivity and high melting point

Low thermal conductivity and high melting point

TRUE ANSWER : ?
YOUR ANSWER : ?

A characteristic property of crystal is its periodicity of structure.

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

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

The material may become an insulator

The superconducting property may be destroyed

The superconducting property is not affected

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

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Curie rule

Onne’s rule

Debye rule

Matthiessen’s rule

TRUE ANSWER : ?
YOUR ANSWER : ?

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 : ?
YOUR ANSWER : ?

With increase in temperature, the electrical conductivity would

Increase in metals but decrease in intrinsic semiconductor

Decrease in metals but increase in intrinsic semiconductor

Decrease in metals as well as in intrinsic semiconductor

Increase in metals as well as in intrinsic semiconductor

TRUE ANSWER : ?
YOUR ANSWER : ?

In solid insulator materials having only one kind of atom, the types of polarization which exist are

Electronic and ionic

Electronic only

Electronic, ionic and permanent

TRUE ANSWER : ?
YOUR ANSWER : ?

Which inductor is used at high frequencies?

Iron alloy cored

Cast iron cored

Ceramic cored

Sheet steel cored

TRUE ANSWER : ?
YOUR ANSWER : ?

As the atoms of rare gases become larger, electronic polarizability

Remains the same

Decreases

Increases

May increase or decrease

TRUE ANSWER : ?
YOUR ANSWER : ?

Debye temperature of metals is

About 600 K

About 200 K

About 10 K

About 2 K

TRUE ANSWER : ?
YOUR ANSWER : ?