Question # 1

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structure are

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5

7

9

14

Each atom in metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about center of a crystal

None of these

Lead, copper and wrought iron are examples of

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brittle substances

ductile substances

plastic substances

elastic substances

In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:

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Adhesive force

Nuclear forces

Inter atomic cohesive force

Electromagnetic force

None of these

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all materials

a given material

all of them

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

The word amorphous means:

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Without any structure

With definite structure

Regular arrangement of molecules

Both (B) and (C)

None of these

In metallic crystals which of the following thing remains constant

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amplitude of oscillations

temperature of solid

average atomic positions

all of them

The substances which break just after the elastic limit is reached, are known as

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brittle substances

ductile substances

plastic substances

elastic substances

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

all of them

The doped semi-conductor materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

When relatively simple molecules are chemically combined into massive molecules, the reaction is called:

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Fission reaction

Fusion reaction

Polymerization

Any of these

None of these

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

Under the elastic region, the deformation produced in the material, the deformation produced in the material will be

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permanent

temporary

either of them

none of them

when the deformation produced in the material become permanent, this type of behaviour is called

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proportionality

elasticity

plasticity

none of them

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