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WorksheetsComposites
Total questions: 25
Worksheet time: 14mins
Which of these describes a composite?
Two or more different materials blended together so you can't tell them apart
Two or more different materials combined to create unique properties
Two or more similar materials that are combined to create properties like the larger material
Which of these is a natural composite?
Bricks
Concrete
Collagen
Carbon nanotubes
Choose ALL the materials that are composites
Concrete
Glass
Wood
Bone
Which pair of materials are in your bones?
Lignin and cellulose
Collagen and hydroxyapatite
Lignin and collagen
Cellulose and hydroxyapatite
Why did people add straw to bricks?
Mud has good compressive strength and good tensile strength
Mud has good compressive strength and poor tensile strength
Mud has poor compressive strength and good tensile strength
Mud has poor compressive strength and poor tensile strength
In concrete, the matrix is
cement
aggregate (small rocks)
What is the definition of a composite?
Composites are when you weld two or more metals together to form a new type of metal.
Composites are a combination of two or more materials that are bonded together to improve their mechanical or physical properties.
Composites are when you take 2 or more metals and fuse them through melting.
Composites are when you take 2 or more matrix and mix them to create a new material.
Laminated glass is often used to make...
Greenhouses
Windows in high-rise buildings
Windows in residential buildings
Vehicle windshields
What is the matrix used to join carbon fibers?
PVA
Epoxy resin
Cyanoacrylate
Urea formaldehyde
Composites always have at least a ______ and a _______
structure and tensile strength
matrix and structure
tensile strength and reinforcement
matrix and reinforcement
What are the properties of Kevlar?
Heavy, incredible strength, low cost
Flexible, elastic, ductile
Waterproof, rigid, low cost
Vibration absorption, incredible strength, abrasion resistance
What must be used to reinforce concrete when making large structures?
Glass fiber
Epoxy resin
Graphene
Steel reinforcement - steel bars
Advantages of Carbon fiber are ...
Mass production processes can be used to bring down costs
Low skilled workers to create complex shapes
Cheap to produce complex shapes
Complex shapes can be created that are extremely strong and lightweight
consist of particles of one material dispersed in a matrix of a second material
particle-reinforced composites
fiber-reinforced composites
structural composites
nanocomposites
Made of coarse aggregate, sand, cement and water.
Concrete
Plywood
Robotic materials
Reinforced polymers
Fibre/Carbon/Glass
Reinforced concrete contains __________ in the concrete pillars which makes them stronger than normal concrete and are able to support larger loads than normal concrete.
Steel rods
Steels sheets
Iron bars
Magnesium
Composite materials are easy to recycle?
True
False
Give a name of the test that determines behavior of materials under crushing loads.
Tensile test
Impact test
Drop test
Compression test
As refers to the above schematic diagram, choose the name of the testing.
Impact test
Drop test
Tensile Test
Compression test
"A system utilizing centre loading on a simple supported beam. A bar of rectangular cross section rests on two supports and is loaded by means of a loading nose midway between the supports."
The above statement is refers to .........................
Three point bending test
Four point bending test
Which is the test that can be measured toughness of the material?
Tensile test
Compression test
Impact Test
Shear test
Cement is mainly calcium oxide (lime) which is made by roasting calcium carbonate (limestone). The calcium carbonate breaks down in a thermal decomposition reaction: CaCO3 --> CaO + CO2
Very high temperatures are needed because this is an endothermic reaction. This means that it
releases energy to the surroundings
absorbs energy from the surroundings
absorbs energy from the reactants
releases energy and stores it in the products
