Question # 1

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

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 metallic crystals which of the following thing remains constant

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amplitude of oscillations

temperature of solid

average atomic positions

all of them

Any superconductor with critical temperature above 77 K, is referred as

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low temperature superconductor

high temperature superconductor

very low temperature superconductor

none of them

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

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deformation

stretching

compressing

elasticity

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 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 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

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

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lattice point

crystal lattice

cubic crystal

unit cell

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one of them

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

Whenever a covalent bond is broken in an intrinsic semi-conductor

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hole is created

an electron is created

an electron-hole pair is generated

all of them

Crystalline solids are in the form of:

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Metals

Ionic Compounds

Ceramics

Both (A) and (B)

All of these

Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at

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125 K

25 K

263 K

163 K

There is a regular arrangement of molecules in a

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amorphous solids

polymeric solids

crystalline solids

none of them

Polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

The smallest three dimensional basic structure is called as:

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An atom

Unit cell

Crystal lattice

Polymer

None of these

The arrangement or molecules or atoms in a crystalline solid can be studied by using:

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Chemical methods

Neutrons

X-ray techniques

Copper atoms

Both (A) and (B)

In case of the three dimensional deformation, when volume is involved, the ratio of applied stress to volumetric strain is called

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Young's modulus

Bulk modulus

Shear modulus

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

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

Examples of crystalline solids are:

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Cooper

NaCl

Zirconia

Both (A) and (B)

All of these

In a cubic crystal, All solids meet at:

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60^o

90^o

109^o

30^o

10^o

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)

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

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

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

Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as

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critical temperature

curie temperature

high temperature

fixed temperature

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