Question # 1

Minority carriers in P-Types , substances are.

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Electrons

Protons

Holes

Neutrons

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

Which of the following has least hysteresis loop area.

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Steel

Wrought Iron

Soft Iron

Cobalt

If both the length and radius of the rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

The number of crystal system are

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Three

Five

Seven

Fifteen

Those materials whose resistivity becomes zero at certain temperature is called:

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Semiconductor

Super conductor

Conductor

Insulator

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

The SI unit of stress is same as that of.

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Pressure

Force

Momentum

Work

Shear modulus is expressed as:

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G = tanθ/F/A

F/A/tanθ

F/tanθ

tanθ/A

Soft magnetic material is

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Sodium

Steel

Iron

Copper

Recentaly a complex crystalline structure known as yttrium barium copper oxide (Yba₂Cu₃O₃) have reported to become super conductor at

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163 K

169 K

200 K

100 K

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

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

An ordinary glass gradually softness into a paste like state before it becomes a very viscous liquid which is possible at

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900^oC

600^oC

800^oC

100^oC

Which one is not a ductile material

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Lead

Steel

Copper

Wrought Iron

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