Question # 1

The electrons occupying the conduction band are known as

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conduction electrons

free electrons

both of them

none of them

An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as

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magnetic

magnetic dipole

magnetic monopole

none of them

The neighbours of every molecule in crystalline solids are arranged in

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an irregular manner

a regular manner

any manner

none 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

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

The charged nucleus of an atom itself spins its magnetic field

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equal to the field produced by orbital electrons

greater than the field produced by orbital electrons

much weaker than the field produced by orbital electrons

none of these

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

The smallest three dimensional basic structure in a crystalline solid is called

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lattice point

crystal lattice

cubic crystal

unit cell

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

none of them

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

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 vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

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

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