Chap 8 form 4

Question 1

What is a ceramic?

Answer 1

solid made up of inorganic an non-metallic substances

Question 2

Examples of ceramic products (3)

Answer 2

Aluminium oxide,silicon carbide,titanium carbide

Question 3

Basic properties of ceramics (5)

Answer 3

pg 11

Question 4

Why ceramic hard and resistant to compression?

Answer 4

atoms are bonded by strong covalent and ionic bonds

Question 5

Why ceramic brittle and weak?

Answer 5

Cannot slide over -force will break the bond between atoms

Question 6

Why cannot conduct electricty

Answer 6

electrons cannot move freely

Question 7

Eg of traditional ceramics

Answer 7

clay and kaolin

Question 8

Meaning of composite materials

Answer 8

hi

Question 9

Examples of composite materials

Answer 9

reinforced concrete,superconductor,fibre optic,fibreglas,photochromic glass

Question 10

Properties of concrete

Answer 10

• cannot withstand vibrations
• high compression strength
• low stretching strength
• resistant to corrosion

Question 11

Properties of steel

Answer 11

• high stretching strength
• corrodes easily
• high tensile strength(strong in tension)

Question 12

another name for steel

Answer 12

wire mesh

Question 13

reinforced concrete

Answer 13

• high compression strength
• high tensile strength
• can be moulded into any shape
• resistant to corrosion
• withstand high pressure

Question 14

uses of reinforced concrete

Answer 14

-to construct frameworks for bridges ,oil platforms .highways, high-rise buildings

Question 15

properties of superconductor

syarat

Answer 15

• zero resistance

- no loss of energy

Question 16

What is the low temp for superconductor called and how to achieve

Answer 16

transistion temp by helium

Question 17

What is perovskite made up of

how to obtain

Answer 17

copper 2 oxide,barium oxide and ytrium oxide(electric insulators)
liquid nitrogen

Question 18

What is perovskite made up of

how to obtain

Answer 18

copper 2 oxide,barium oxide and ytrium oxide(electric insulators)/high electric resistance
liquid nitrogen

Question 19

uses of superconductors (3)

Answer 19

• efficient generator
• transformer
• electric cable
• amplifier
• high speed levitated train

Question 20

uses of fibre optics

Answer 20

• can transmit electronic data or signal
• in the form of light instead of electron
• at a high speed
• uses in endocope

Question 21

What is fibre optics consist of ?(2)

Answer 21

core
-glass of higher refractive index
enclosed by
-glass cladding of lower refractive index

Question 22

benefits of fibre optic

Answer 22

• carry more data with less interference
• high chemical stability
• low chemical cost

Question 23

What is optical fibre made up of?2

Answer 23

plastic and glass fibre

Question 24

properties of plastic (optic fibre)

Answer 24

• high compression strength

- flexible

Question 25

Properties of glass fibre (optic fibre )

Answer 25

• low compression strength

- hard

Question 26

properties of optic fibre

Answer 26

• high compression strength

- flexible

Question 27

Function of alloying

Answer 27

1) increase hardness ad strength of metal
2) prevent corrosion or rusting
3) improve appearance

Question 28

carbon steel

Answer 28

major -iron

minor -carbon

Question 29

duralumin

Answer 29

body or airplanes
racing bikes

aluminium
copper
mg
mn

Question 30

bronze

Answer 30

medals
monuments
trophies

Question 31

brass

Answer 31

musical instrument

doorknob

Question 32

steel vs stainless steel

Answer 32

iron carbon

iron ,chromium ,nickel