Question # 1

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

The ability of a body to return to its original shape is called.

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Strain

Stress

Elasticity

Plasticity

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

Which one of the following is ductile substance.

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Copper

Lead

Wrought iron

All of them

Young's modulus for water's is

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Zero

1

2

3

Which one of the following is crystalline solid.

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Zirconia

Glassy solid

Natural rubber

Poly strene

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

The word amorphous means:

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Regular structured

Without form or structure

Frozen structured

None of above

Soft magnetic material is

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Sodium

Steel

Iron

Copper

The solid with definite M.L are called:

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Crystalline

Amorphous

Polymeric

None of above

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

The first superconductor was discovered in:

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1831

1911

1921

1876

Minority carriers in P-Types , substances are.

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Electrons

Protons

Holes

Neutrons

Example of ductile substance is.

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Glass

Wood

Lead

Oxygen

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

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

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