Question # 1

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

In a cubic crystal, All solids meet at:

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60^o

90^o

109^o

30^o

10^o

The critical temperature of aluminium is

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1.18 K

4.2 K

3.72 K

7.2 K

When relatively simple molecules are chemically combined into massive molecules, the reaction is called:

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Fission reaction

Fusion reaction

Polymerization

Any of these

None of these

Zirconia is classified as:

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Ceramic solid

Ionic compound

Metal

Either (A) or (B)

Either (B) or (C)

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

The domains are of macroscopic size of the order of

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centimeters

meters

millimeters

nanomneters

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 first super conductor was discovered in

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1811

1890

1901

1911

In case of the three dimensional deformation, when volume is involved, the ratio of applied stress to volumetric strain is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

The pattern of NaCl particles have a shape which is :

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Cubic

Body centred cubic

Simple cubic

face centred

Both (A) and (C)

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 maximum stress that a material can withstand, is known as

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plastic point

elastic limit

yield point

ultimate tensile strength

In a semi-conductor material, the total current is

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only the +ve current

only the electronic current

sum of +ve and electronic current

all of them

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all of them

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

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

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