Question # 1

Each atom in metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about center of a crystal

None of these

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)

The first super conductor was discovered in

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1811

1890

1901

1911

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

When a stress changes the shape, it is called the

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compressional stress

tensile stress

shear stress

any one 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 critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

Whenever a covalent bond is broken in an intrinsic semi-conductor

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hole is created

an electron is created

an electron-hole pair is generated

all of them

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

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

There are some whose resistivity becomes zero below a certain temperature, called

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absolute zero

0°C

critical temperature

lower fixed point

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

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deformation

stretching

compressing

elasticity

The transition from solid to liquid is actually from:

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Order to disorder

Disorder to order

Order to order

Disorder to disorder

None of these

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all 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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