Question # 1

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 pattern of NaCl particles have a shape which is :

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Cubic

Body centred cubic

Simple cubic

face centred

Both (A) and (C)

The band above the valence band is called

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high energy band

conduction band

empty band

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

Examples of crystalline solids are:

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Cooper

NaCl

Zirconia

Both (A) and (B)

All of these

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

The doped semi-conductor materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

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 a semi-conductor material, the total current is

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only the +ve current

only the electronic current

sum of +ve and electronic current

all of them

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

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deformation

stretching

compressing

elasticity

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 molecules or ions in a crystalline solids are

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static

not static

randomly moving

all 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

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

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Physics ECAT Pre Engineering Chapter 17 Physics of Solid Online Test MCQs With Answers

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