Question # 1

Semiconductors have conductivity of order:

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10^-8 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10² to 10⁵ (Ωm)^-1

10^-5 to 10^-7 (Ωm)^-1

There is regular arrangement of molecules in:

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Amorphous solids

Crystalline solids

Both a and b

None of above

The dimension of stress is

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[MLT^-1]

[ML^-1T]

[ML^-1T^-1]

[ML^-1T^-2]

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

A solid having regular arrangement of molecules throughout its structure is called.

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

Which of the following has bulk modulus?

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Water

Gas

Honey

All

A material which is insulator at 0 K and conduct at room temperature is.

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Silver

Lead

Germanium

Polythene

The temperature at which, semiconductor behaves as insulators:

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10k

0k

237k

None of above

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

In extrinsic semiconductors doping is of the order of.

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1 atom to 10⁴

1 atom to 10⁶

1 atom to 10⁸

1 atom to 10³

The number of crystal system are

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Three

Five

Seven

Fifteen

Shear modulus is expressed as:

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G = tanθ/F/A

F/A/tanθ

F/tanθ

tanθ/A

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

The critical temperature of mercury is.

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1.18 K

4.2 K

3.72 K

7.2 K

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

Young's modulus for water's is

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Zero

1

2

3

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