Question # 1

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

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 units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

The bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

Amorphous solids are also more like

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crystalline solids

gases

liquids

any one of them

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

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

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

A semi-conductor in its extremely pure form is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

The pattern of NaCl particles have a shape which is :

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Cubic

Body centred cubic

Simple cubic

face centred

Both (A) and (C)

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

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

Polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

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

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

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

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ECAT Physics Chapter 17 Physics of Solids Online Test MCQs With Answers

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