Question # 1

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

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

Recent studies of ferromagnetism have shown that there exists in ferromagnetic substances small regions called

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tiny regions

domains

vectors

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

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

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none 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

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

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 bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

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 electrons occupying the conduction band are known as

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conduction electrons

free electrons

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

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either (A) or (B)

Either (B) or (C)

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

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