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

An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at:

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800^oC

500^oC

300^oC

100^oC

None of these

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

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

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

When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all materials

a given material

all of them

In the doping process, the ratio of the doping atoms to the semi conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

Polymers are the chemical combination of carbon with:

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Nitrogen

Oxygen

Hydrogen

All of these

None of these

Tick the one which is not a crystalline solid:

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Zirconia

Glass

Copper

Ceramic solid

An ionic compound

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 doped semi-conductor materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

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 curie temperature of iron is about

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250°C

500°C

750°C

1000°C

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ECAT Physics Chapter 17 Physics of Solids Online Test MCQs With Answers

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