Question # 1

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

In metallic crystals which of the following thing remains constant

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amplitude of oscillations

temperature of solid

average atomic positions

all of them

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

The force which maintain the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

Amorphous solids:

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Have definite melting points

Are called glassy solids

Have no definite melting point

Both (B) and (C)

Both (A) and (C)

A unit cell is smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

The greatest stress that a material can endure without losing the proportionality between stress and strain is called

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plastic line

breaking point

proportional limit

none of them

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

The transition from solid to liquid is actually from:

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Order to disorder

Disorder to order

Order to order

Disorder to disorder

None of these

The substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

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

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

when the deformation produced in the material become permanent, this type of behaviour is called

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proportionality

elasticity

plasticity

none of them

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

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