Question # 1

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

The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

Within each domain, the magnetic field of all the spinning electrons are

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parallel

antiparallel

perpendicular

all of them

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

Amorphous solids are also called as

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crystalline solids

polymeric solids

glassy solids

any one of them

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

The smallest three dimensional basic structure is called as:

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An atom

Unit cell

Crystal lattice

Polymer

None of these

The solids are classified as:

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Metals

Crystalline

Amorphous

Polymeric

All except (A)

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

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impurification

adding

doping

extrinsivity

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

Polymers are the chemical combination of carbon with:

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Nitrogen

Oxygen

Hydrogen

All of these

None of these

Polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

There are some whose resistivity becomes zero below a certain temperature, called

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absolute zero

0°C

critical temperature

lower fixed point

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