Question # 1

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

In metallic crystals which of the following thing remains constant

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amplitude of oscillations

temperature of solid

average atomic positions

all of them

The molecules or ions in a crystalline solids are

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static

not static

randomly moving

all of them

Arsenic, antimony and phosphorus are the elements from

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third group

fourth group

fifth group

none of them

The bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:

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Adhesive force

Nuclear forces

Inter atomic cohesive force

Electromagnetic force

None of these

Synthetic materials fall into the category of

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crystalline solids

amorphous

polymeric solids

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 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 maximum stress that a material can withstand, is known as

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plastic point

elastic limit

yield point

ultimate tensile strength

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

The crystalline structure of NaCI is

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rectangular

hexagonal

tetrahedral

cubical

The word amorphous means:

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Without any structure

With definite structure

Regular arrangement of molecules

Both (B) and (C)

None of these

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 cohesive forces between atoms, molecules or ions in crystalline solids maintain the strict

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short range order

long range order

both of them

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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