Question # 1

The measure of the deformation in a solid when stress is applied to its is called

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elastic constant

young's modulus

strain

elasticity

An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as

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magnetic

magnetic dipole

magnetic monopole

none of them

Polymers are the chemical combination of carbon with:

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Nitrogen

Oxygen

Hydrogen

All of these

None of these

The domains are of macroscopic size of the order of

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centimeters

meters

millimeters

nanomneters

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

The doped semi-conductor materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

The band above the valence band is called

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high energy band

conduction band

empty band

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)

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

The ratio of shearing stress/shearing strain is called as

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Modulus

Pascal modulus

Hooker's modulus

Shear modulus

The maximum stress that a material can withstand, is known as

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plastic point

elastic limit

yield point

ultimate tensile strength

Under the elastic region, the deformation produced in the material, the deformation produced in the material will be

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permanent

temporary

either of them

none of them

The magnetism produced by electrons within an atom can arise from

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electrons orbiting the nucleus

electrons posses a spin

both motions

none of these motions

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

either of them

none of them

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

On heating, glass gradually softens into a paste like before it becomes a very viscous liquid at almost

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600°C

7600°C

800°C

900°C

The first super conductor was discovered in

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1811

1890

1901

1911

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

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

In the doping process, the ratio of the doping atoms to the semi conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

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 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 SI unit of strain is

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N

Dynes

Pascal

Dimensionless

The SI unit of stress is

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N/m²

Nmc

dynes/m

N

Crystalline solids are in the form of:

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Metals

Ionic Compounds

Ceramics

Both (A) and (B)

All of these

A semi-conductor in its extremely pure form is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none 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

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as

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conductors

insulators

semi-conductors

all of them

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 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

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ECAT Pre General Science Physics Chapter 17 Physics of Solids Online Test MCQs With Answers

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