Question # 1

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 word amorphous means:

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Without any structure

With definite structure

Regular arrangement of molecules

Both (B) and (C)

None of these

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 results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

The SI unit of stress is

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N/m²

Nmc

dynes/m

N

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

In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:

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Adhesive force

Nuclear forces

Inter atomic cohesive force

Electromagnetic force

None of these

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

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 substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all 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 ratio of linear stress/linear strain is called as

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Yong's modulus

Bulk modulus

Shear modulus

Modulus

There are some whose resistivity becomes zero below a certain temperature, called

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absolute zero

0°C

critical temperature

lower fixed point

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

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plastic point

elastic limit

yield point

ultimate tensile strength

Examples of crystalline solids are:

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Cooper

NaCl

Zirconia

Both (A) and (B)

All of these

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

Recent studies of ferromagnetism have shown that there exists in ferromagnetic substances small regions called

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tiny regions

domains

vectors

none of them

When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

In the stress-strain graph, stress is increased linearly with strain until a point is reached, this point is known as

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plastic limit

plastic deformation

proportional limit

elastic behaviour

The ratio of shearing stress/shearing strain is called as

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Modulus

Pascal modulus

Hooker's modulus

Shear modulus

When relatively simple molecules are chemically combined into massive molecules, the reaction is called:

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Fission reaction

Fusion reaction

Polymerization

Any of these

None of these

A structure of polymeric solid is:

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An ordered structure

A disordered structure

Intermediate between order and disorder

Any of these

None of these

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)

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one of them

A unit cell is smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

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