Question # 1

A unit cell is smallest basic structure which is:

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One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

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

On heating, glass gradually softens into a paste like before it becomes a very viscous liquid at almost

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600°C

7600°C

800°C

900°C

The critical temperature of tin is

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1.18 K

4.2 K

3.72 K

7.2 K

Amorphous solids are also more like

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crystalline solids

gases

liquids

any one of them

Examples of crystalline solids are:

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Cooper

NaCl

Zirconia

Both (A) and (B)

All 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

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

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 vast majority of solids are in the form of

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amorphous structure

polymeric structure

crystalline structure

all of them

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

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 molecules or ions in a crystalline solids are

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static

not static

randomly moving

all of them

Each atom in metal crystal:

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Remains fixed

Vibrates about a fixed point

Moves randomly

Rotates about center of a crystal

None of these

The electrons in the outermost shell of an atom are called

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core electrons

valence electrons

high energy electrons

none of them

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Physics ECAT Pre Engineering Chapter 17 Physics of Solid Online Test MCQs With Answers

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