Question # 1

Which one is not a ductile material

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Lead

Steel

Copper

Wrought Iron

A solid in which there is not regular arrangement of molecules is called.

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Glassy solid

Amorphous solid

Crystalline solid

Both a and b

The first superconductor was discovered in:

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1831

1911

1921

1876

Which one of the following is polymeric solids

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Glass

Nylon

Copper

Zinc

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

After curie temperature.

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Ferromagnetic

Paramagnetic

Magnetic

Diamagnetic

The word amorphous means:

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Regular structured

Without form or structure

Frozen structured

None of above

Which one of the following is ductile substance.

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Copper

Lead

Wrought iron

All of them

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

In 'N' type material, the minority charge carriers are.

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Free electrons

Holes

Protons

Mesons

Natural rubber is an example of:

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Crystalline solids

Amorphous solids

Polymeric solids

None of above

Recently superconductor discovered is at temperature.

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110K

143K

16.3K

119K

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

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

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Silver

Lead

Germanium

Polythene

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