Question # 1

The vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all 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

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

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 case of the three dimensional deformation, when volume is involved, the ratio of applied stress to volumetric strain is called

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Young's modulus

Bulk modulus

Shear modulus

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

The first super conductor was discovered in

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1811

1890

1901

1911

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 measure of the deformation in a solid when stress is applied to its is called

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elastic constant

young's modulus

strain

elasticity

The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

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 band above the valence band is called

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high energy band

conduction band

empty band

none of them

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

The pattern of crystalline solid is:

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One dimesional

Two dimensional

Three dimensional

Either (A) or (B)

None of these

Recent studies of ferromagnetism have shown that there exists in ferromagnetic substances small regions called

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tiny regions

domains

vectors

none of them

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

The critical temperature of aluminium is

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1.18 K

4.2 K

3.72 K

7.2 K

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

The SI unit of stress is

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N/m²

Nmc

dynes/m

N

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

Polymers are the chemical combination of carbon with:

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Nitrogen

Oxygen

Hydrogen

All of these

None of these

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 neighbours of every molecule in crystalline solids are arranged in

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an irregular manner

a regular manner

any manner

none of them

The force which maintain the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

The amplitude of oscillation of each atom in a metallic crystal rises with the

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rise in temperature

decrease in temperature

even temperature remains constant

all of them

Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at

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125 K

25 K

263 K

163 K

Whenever a covalent bond is broken in an intrinsic semi-conductor

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hole is created

an electron is created

an electron-hole pair is generated

all of them

Electrons of an isolated atom are bound to the nucleus, and

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy levels

none of these

There is a regular arrangement of molecules in a

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amorphous solids

polymeric solids

crystalline solids

none of them

In the stress-strain graph, stress is increased linearly with strain until a point is reached, this point is known as

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plastic limit

plastic deformation

proportional limit

elastic behaviour

When a silicon crystal is doped with a pentavalent element, such an extrinsic semi-conductor is called

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p-type semi-conductor

n-type semi-conductor

either of them

none of them

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