Question # 1

Yield stress is another name of

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Plasticity

Proportional limit

Elastic limit

Both (b) and (c)

the substances in which the atoms do not form magnetic dipoles are called.

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Diamagnetic

Para magnetic

Ferro magnetic

Crystal

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

Glass and high steel carbon are example of.

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Ductile substances

Brittle substances

Soft substances

Hard substances

A wire stretched to double of its length, its strain is:

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2

1

0

0.5

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

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

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Free electrons

Holes

Protons

Mesons

The number of crystal system are

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Three

Five

Seven

Fifteen

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

Curie temperature is

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Differen for chromium oxide and cobalt

Same for chromium oxide and cobalt

Same for iron and cobalt

None of these

The word amorphous means:

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Regular structured

Without form or structure

Frozen structured

None of above

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

There is regular arrangement of molecules in:

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Amorphous solids

Crystalline solids

Both a and b

None of above

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

Coercive force is used to

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Demagnetize the material

Magnetize the material

Extend it

None of these

Which one is not a crystalline solid.

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Zinc

Copper

Nylon

None of these

To get N-Type the Ge is doped with

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Aluminium

Arsenic

Boron

Indium

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

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