Question # 1

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

The SI unit of stress is same as that of.

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Pressure

Force

Momentum

Work

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

Conductors have conductivities of order:

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10³(Ωm)-1

10⁷(Ωm)^-1

10⁷Ωm^-1

10^-6Ω

The conductors having the conductivity of the order of

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A cable breaks if stretched by more than 2mm. It is cut into two equal parts. How much either part can be stretched without breaking?

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25 m

1mm

2mm

0.5 m

Natural rubber is an example of:

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Crystalline solids

Amorphous solids

Polymeric solids

None of above

The word amorphous means:

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Regular structured

Without form or structure

Frozen structured

None of above

The first superconductor was discovered in:

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1831

1911

1921

1876

Out of the following which material is brittle.

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Wrought iron

Copper

Tungsten

High steel carbon

To get N-Type the Ge is doped with

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Aluminium

Arsenic

Boron

Indium

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

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Diamagnets

Paramagnets

Ferromagnets

All of these

Substance which break just after the elastic limit is reached are called as.

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Ductile substances

Hard substances

Britto substances

Soft substances

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

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3

4

5

7

Energy band theory is based upon

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Hund's Rule

Heisenberg uncertainty principle

Bohr's atomic Model

Wave mechanical model

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

Yield stress is another name of

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Plasticity

Proportional limit

Elastic limit

Both (b) and (c)

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