Question # 1

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

The SI unit of stress is

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N/m²

Nmc

dynes/m

N

Polymers are the chemical combination of carbon with:

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Nitrogen

Oxygen

Hydrogen

All of these

None of these

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

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

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

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

The solids which has structure in-between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

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energy bands

energy shells

states

all of them

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

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deformation

stretching

compressing

elasticity

Which of the following theory completely explain the three types of materials

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Bohr model of electron distribution

Rutherford atomic model

Pauli's exclusion principle

energy band theory

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

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

The ratio of linear stress/linear strain is called as

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Yong's modulus

Bulk modulus

Shear modulus

Modulus

The force which maintain the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

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)

Polymeric solids have

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low specific gravity

high specific gravity

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

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 word amorphous means:

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Without any structure

With definite structure

Regular arrangement of molecules

Both (B) and (C)

None of these

Within each domain, the magnetic field of all the spinning electrons are

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parallel

antiparallel

perpendicular

all of them

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 solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all materials

a given material

all of them

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

none of them

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)

Which of the following can become a good temporarily magnet

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iron

steel

both of them

none of them

The molecules or ions in a crystalline solids are

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static

not static

randomly moving

all of them

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