LESSON 2(PART2) Classification of Material

Question 1

Properties of Materials

Answer 1

Mechanical Properties
CHEMICAL PROPERTIES
ELECTRICAL PROPERTIES
MAGNETIC PROPERTIES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
OTHER PROPERTIES

Question 2

The resistance of a material to the __________ is found out by dividing the difference in weights of specimens prior to and after ______ with the area of ________.

Answer 2

Abrasion

Question 3

In many applications, the building materials are required to sustain steady loads for long periods

Answer 3

Creep

Question 4

When a load is applied to a material, there is a
change in its shape and dimension.

Answer 4

ELASTICITY

Question 5

two types of deformation

Answer 5

ELASTIC DEFORMATION
PLASTIC DEFORMATION

Question 6

A deformation is said to be _______ when the solid deforms when it is loaded but returns to its original position when unloaded

Answer 6

Elastic Deformation

Question 6

A deformation is said to be ______ when the solid retains full or partly the change in shape after the load is removed

Answer 6

Plastic Deformation

Question 7

When the materials are subjected to a repetitive or fluctuating stress, they will fail at a stress much lower than that required to cause fracture under steady loads.

Answer 7

Fatigue

Question 8

The ability of a material to resist penetration by a harder body

Answer 8

Hardness

Question 9

Scale of hardness

Answer 9

Mohs’ scale of hardness

Question 10

Lowest remarks of hardness

Answer 10

Talc

Question 11

Highest remarks of hardness

Answer 11

Diamond

Question 12

The _______ strength of a material is the quantity of work required to cause its failure per its unit volume

Answer 12

Impact Strength

Question 13

defined as its ability to change its shape under load without cracking and to retain its shape after the removal of load. The _______ materials fail suddenly under pressure without appreciable deformation preceding the failure.

Answer 13

Plasticity and Brittleness

Question 14

The ability of a material to resist failure under the action of stresses caused by a load

Answer 14

Strength

Question 15

The failure of a material under the combined actions of abrasion and impact

Answer 15

Wear

Question 16

material suggest the tendency of the material to combine with other substances, its reactivity, solubility and effects like corrosion, chemical composition, acidity, alkalinity, etc.

Answer 16

Chemical Properties

Question 17

When iron reacts with oxygen, iron oxide is formed which is red in color and iron metal is coated with it

Answer 17

Corrosion

Question 18

the ability of the material to resist the flow of an electric current and they include conductivity, dielectric strength and resistivity.

Answer 18

Electrical Properties

Question 19

This refers to the ability of the material to allow the passage of electricity or heat.

Answer 19

Conductivity

Question 20

the measure of magnetization that a material obtains in response to an applied magnetic field

Answer 20

Permeability

Question 21

a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past

Answer 21

hysteresis

Question 22

the value of the external magnetic field that brings to zero the magnetization or magnetic flux density of a magnetic body when that external magnetic field is caused to operate in the opposite direction from the orientation of the magnetization of the magnetic body

Answer 22

Coercive force

Question 23

Optical Properties:

Answer 23

1. Color
2. light transmission
3. refractive index
4. reflectivity

Question 24

used to mean the mass of a unit volume of material in its natural state i.e. including pores and voids. It is obtained by finding out the ratio of mass of specimen to the volume of specimen in its natural state

Answer 24

Bulk Density

Question 25

The ability of material to withstand the action of acids, alkalis, gases and salt solution.

Answer 25

Chemical Resistance

Question 26

The ratio of compressive strength of material saturated with water to that in dry state

Answer 26

Coefficient of Softening

Question 27

The ratio of bulk density of a material to its density and it thus denotes the degree to which its volume is filled up with solid matter

Answer 27

Density Index

Question 28

material is defined as the mass of a unit volume of homogeneous material. It is obtained by working out the ratio of mass of material to the volume of material in homogeneous state.

Answer 28

Density

Question 29

The property of a material to resist the combined action of atmospheric and other factors

Answer 29

Durability

Question 30

used to mean the ability of a material to resist the action of high temperature without losing its load-bearing capacity.

Answer 30

Fire Resistance

Question 31

The ability of a water-saturated material to resist repeated freezing and thawing without considerable decrease of mechanical strength or visible signs of failure is known as the frost resistance

Answer 31

Frost Resistance

Question 32

The property of a material to absorb water vapor from air

Answer 32

Hygroscopicity

Question 33

used to indicate the degree by which the volume of a material is occupied by pores.

Answer 33

Porosity

Question 34

ability of a material to withstand prolonged action of high temperature without melting or loosing shape.

Answer 34

Refractoriness

Question 35

The ability of a material to endure a certain number of cycles of sharp temperature variations without failing it mainly depends on the coefficients of linear expansion of its constituents.

Answer 35

Spalling Resistance

Question 36

defined as the quantity of heat, expressed in kilocalories, required to heat 1 N of material by 1°C.

Answer 36

Specific Heat

Question 37

The property of a material to absorb heat

Answer 37

Thermal Capacity

Question 38

the amount of heat in kilocalories that will flow through unit area of the material with unit thickness in unit time when difference of temperature on its faces is also unity.

Answer 38

Thermal Conductivity

Question 39

The ability of a material to absorb and retain water and shape of pores, present in the material.

Answer 39

Water Absorption

Question 40

The capacity of a material to allow water to pass through it under pressure

Answer 40

. Water Permeability

Question 41

Other Properties

Answer 41

Thermal Properties: Technological Properties:

Question 42

specific heat, thermal expansion and conductivity

Answer 42

Thermal Properties: