Question # 1

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 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

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

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

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

On heating, glass gradually softens into a paste like before it becomes a very viscous liquid at almost

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600°C

7600°C

800°C

900°C

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

The critical temperature of mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

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

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 bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

The critical temperature of aluminium is

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1.18 K

4.2 K

3.72 K

7.2 K

In a cubic crystal, All solids meet at:

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60^o

90^o

109^o

30^o

10^o

The molecules or ions in a crystalline solids are

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static

not static

randomly moving

all 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

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)

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

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parallel

antiparallel

perpendicular

all of them

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

There is a regular arrangement of molecules in a

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amorphous solids

polymeric solids

crystalline solids

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

The measure of the deformation in a solid when stress is applied to its is called

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elastic constant

young's modulus

strain

elasticity

The magnetism produced by electrons within an atom can arise from

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electrons orbiting the nucleus

electrons posses a spin

both motions

none of these motions

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 substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all 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

The bands below the valence band are

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completely filled and play active part in conduction process

completely filled and plays no part in conduction process

completely filled and play active part in conduction process

not completely filled and play no part in conduction process

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

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

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