Question # 1

When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

Tick the one which is not polymer solid:

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Zirconia

Polythene

Nylon

Synthetic rubber

None of these

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one of them

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

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permanent

temporary

either of them

none of them

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

A structure of polymeric solid is:

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An ordered structure

A disordered structure

Intermediate between order and disorder

Any of these

None of these

An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at:

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800^oC

500^oC

300^oC

100^oC

None of these

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

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ECAT Physics Chapter 17 Physics of Solids Online Test MCQs With Answers

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