Question # 1

In glass, molecules are irregularly arranged so it is known as.

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Solid

Liquid

Solid liquid

Gas

Semiconductors have conductivity of order:

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10^-8 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10² to 10⁵ (Ωm)^-1

10^-5 to 10^-7 (Ωm)^-1

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

Which one is not a ductile material

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Lead

Steel

Copper

Wrought Iron

The word amorphous means:

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Regular structured

Without form or structure

Frozen structured

None of above

There is regular arrangement of molecules in:

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Amorphous solids

Crystalline solids

Both a and b

None of above

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

The SI unit of Stress is:

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Nm

Nm²

NM^-2

Nm³

The conductors having the conductivity of the order of

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Which one is not a crystalline solid.

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Zinc

Copper

Nylon

None of these

A semiconductor in its extremely pure form is known as:

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Intrinsic

Extrinsic

Both a and b

None of above

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

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3

4

5

7

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

The substance which atom cooperates with each other in such a way so as to exhibit a strong magnetic field is called.

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Ferromagnetic

Paramagnetic

Diamagnetic

Non magnetic

Natural rubber is an example of:

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Crystalline solids

Amorphous solids

Polymeric solids

None of above

Yield stress is another name of

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Plasticity

Proportional limit

Elastic limit

Both (b) and (c)

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 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

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