Question # 1

The SI unit of stress is

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N/m²

Nmc

dynes/m

N

In a cubic crystal, All solids meet at:

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60^o

90^o

109^o

30^o

10^o

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

The solids which has structure in-between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

In a semi-conductor material, the total current is

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only the +ve current

only the electronic current

sum of +ve and electronic current

all of them

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all of them

An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as

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magnetic

magnetic dipole

magnetic monopole

none of them

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

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

A unit cell is smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

Every crystalline solid has

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definite melting point

different melting points

may or may not be definite

none of them

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