Question # 1

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 stress is

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N/m²

Nmc

dynes/m

N

In a semi-conductor material, current flows due to

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positive charge

negative charge

both 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

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

Tick the one which is not polymer solid:

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Zirconia

Polythene

Nylon

Synthetic rubber

None of these

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

The transition from solid to liquid is actually from:

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Order to disorder

Disorder to order

Order to order

Disorder to disorder

None of these

The amplitude of oscillation of each atom in a metallic crystal rises with the

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rise in temperature

decrease in temperature

even temperature remains constant

all of them

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all of them

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

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 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)

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

The ratio of linear stress/linear strain is called as

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Yong's modulus

Bulk modulus

Shear modulus

Modulus

The pattern of crystalline solid is:

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One dimesional

Two dimensional

Three dimensional

Either (A) or (B)

None of these

Each atom in metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about center of a crystal

None of these

The curie temperature of iron is about

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250°C

500°C

750°C

1000°C

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 transition from solid state to liquid state is:

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Abrupt

Slow

Continous

Discontinous

Both (A) and (D)

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

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

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

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 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 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)

The bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

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

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