Question # 1

The doped semi-conductor materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

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 bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all of them

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

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

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

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 maximum stress that a material can withstand, is known as

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plastic point

elastic limit

yield point

ultimate tensile strength

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

Crystalline solids are in the form of:

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Metals

Ionic Compounds

Ceramics

Both (A) and (B)

All of these

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none 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

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