Question # 1

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

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

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

A unit cell is smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one of them

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

Polymeric solids have

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low specific gravity

high specific gravity

either of them

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 vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

Which of the following can become a good permanent magnet

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iron

steel

both of them

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 whole structure obtained by the repetition of unit cells is called:

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Crystal lattice

Amorphous solid

Polymeric solid

Polysterne

None of these

The 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

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

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

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

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 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

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none 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

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 band above the valence band is called

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high energy band

conduction band

empty band

none of them

The transition from solid state to liquid state is:

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Abrupt

Slow

Continous

Discontinous

Both (A) and (D)

The first super conductor was discovered in

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1811

1890

1901

1911

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

The ratio of shearing stress/shearing strain is called as

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Modulus

Pascal modulus

Hooker's modulus

Shear modulus

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ECAT Pre General Science Physics Chapter 17 Physics of Solids Online Test MCQs With Answers

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