Question # 1

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

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

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deformation

stretching

compressing

elasticity

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 neighbours of every molecule in crystalline solids are arranged in

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an irregular manner

a regular manner

any manner

none of them

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

The word amorphous means:

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Without any structure

With definite structure

Regular arrangement of molecules

Both (B) and (C)

None of these

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

The whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polysterne

None of these

There is a regular arrangement of molecules in a

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amorphous solids

polymeric solids

crystalline solids

none of them

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)

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

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

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