Question # 1

The pattern of crystalline solid is:

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One dimesional

Two dimensional

Three dimensional

Either (A) or (B)

None of these

The conduction band in a solid

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may be empty

cannot be empty

should be filed

all of them

Glass and high carbon steel are the examples of

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brittle substances

ductile substances

plastic substances

elastic substances

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

The substances in which, atom are so oriented that their fields support each other and the atoms behave like tiny magnets, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

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

In the doping process, the ratio of the doping atoms to the semi conductor atom is

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1 to 10

1 to 10³

1 to 10⁶

1 to 10⁹

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

Which of the following can become a good temporarily magnet

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iron

steel

both of them

none of them

Any superconductor with critical temperature above 77 K, is referred as

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low temperature superconductor

high temperature superconductor

very low temperature superconductor

none of them

Amorphous solids:

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Have definite melting points

Are called glassy solids

Have no definite melting point

Both (B) and (C)

Both (A) and (C)

The charged nucleus of an atom itself spins its magnetic field

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equal to the field produced by orbital electrons

greater than the field produced by orbital electrons

much weaker than the field produced by orbital electrons

none of these

The domains are of macroscopic size of the order of

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centimeters

meters

millimeters

nanomneters

A unit cell is smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

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