Question # 1

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

Amorphous solids are also more like

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crystalline solids

gases

liquids

any one 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

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

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

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

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

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 solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

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 crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

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

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

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are

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5

7

9

14

Amorphous solids are also called as

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crystalline solids

polymeric solids

glassy solids

any one 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

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

Polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

The smallest three dimensional basic structure is called as:

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An atom

Unit cell

Crystal lattice

Polymer

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 critical temperature of aluminium is

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1.18 K

4.2 K

3.72 K

7.2 K

Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at

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125 K

25 K

263 K

163 K

The bonding between the semi-conductor materials is

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covalent

ionic

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)

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 critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

The materials in which valence electrons are bound very tightly to their atoms and are not free, are known as

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conductors

insulators

semi-conductors

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 electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

There is a regular arrangement of molecules in a

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amorphous solids

polymeric solids

crystalline solids

none of them

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

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