Question # 1

Tick the one which is not polymer solid:

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Zirconia

Polythene

Nylon

Synthetic rubber

None of these

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 electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

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

Electrons of an isolated atom are bound to the nucleus, and

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy levels

none of these

The cohesive forces between atoms, molecules or ions in crystalline solids maintain the strict

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short range order

long range order

both of them

none of them

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

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impurification

adding

doping

extrinsivity

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

The smallest three dimensional basic structure in a crystalline solid is called

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lattice point

crystal lattice

cubic crystal

unit cell

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either (A) or (B)

Either (B) or (C)

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

In a soft iron, domains are

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easily oriented along external field and do not return to original random positions

easily oriented along external field and readily returns to originally random position

do no oriented along external field and also do not returns to originally random position

none 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 critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

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

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