Question # 1

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 critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

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

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

The SI unit of stress is

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N/m²

Nmc

dynes/m

N

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

Polymers are the chemical combination of carbon with:

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Nitrogen

Oxygen

Hydrogen

All of these

None of these

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

The critical temperature of aluminium is

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1.18 K

4.2 K

3.72 K

7.2 K

Amorphous solids:

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Have definite melting points

Are called glassy solids

Have no definite melting point

Both (B) and (C)

Both (A) and (C)

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

Any superconductor with critical temperature above 77 K, is referred as

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low temperature superconductor

high temperature superconductor

very low temperature superconductor

none of them

Polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all of them

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