Question # 1

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

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

The ratio of linear stress/linear strain is called as

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Yong's modulus

Bulk modulus

Shear modulus

Modulus

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

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

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all materials

a given material

all of them

In a cubic crystal, All solids meet at:

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60^o

90^o

109^o

30^o

10^o

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

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

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proportionality

elasticity

plasticity

none of them

Polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

Which of the following can become a good permanent magnet

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iron

steel

both of them

none 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

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

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)

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

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

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