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WorksheetsRECAP GRADE 8 METALS-PLASTICS
Total questions: 35
Worksheet time: 18mins
Which of the following is another name for plastic?
Polymer
Ploymer
Oil
Man made material
Which of the following properties of plastic is best shown in the image below?
Heat Insulation
Light weight
Colorful
Shiny
Plastics do NOT rust. True or False?
True
False
Plastics take a long time to break down. True or False?
True
False
Plastic is NOT made from Oil. True or False?
False
True
Which of the following items below contains plastic?
Which of the following items below contains plastic?
Select ALL of the following which are properties of plastics.
Light weight
Easy to manufacture
Brittle
Sonorous
Select the response below that best defines plastics.
These are clear liquid plastic products that hardens to create a thick, durable, glossy coating.
These are also chemical compounds where molecules are bonded together in long repeating chains.
This is one of the most used plastic material in the world and is usually white.
Plastics are divided into ___ groups.
2
3
4
5
Identify the group of plastics that soften when heated, harden when cooled and can be reshaped if heat is reapplied.
(a)
Identify the group of plastics that hardens under pressure, is permanently set and cannot be reshaped.
(a)
Identify ALL the plastics that soften when heated and hardens when cools.
Nylon
Urea
Vinyl
Polyester
Melamine
Identify ALL the plastics that hardens under pressure then it is permanently set.
Nylon
Urea
Vinyl
Polyester
Melamine
Identify ALL the disadvantages of plastics.
Combustible
Light weight
Produce toxic fumes
Non-renewable
Corrosion resistant
Identify ALL the disadvantages of plastics.
Combustible
Light weight
Produce toxic fumes
Non-renewable
Corrosion resistant
Identify ALL the properties of plastics.
Strong
Lightweight
Heavy
Renewable
Low Cost
Look at the image and identify the group of plastics in which it belongs.
Thermosetting Plastic
Thermoplastics
Look at the image and identify the group of plastics in which it belongs.
Thermosetting Plastic
Thermoplastics
Look at the image and identify the group of plastics in which it belongs.
Thermosetting Plastic
Thermoplastics
Look at the image and identify the group of plastics in which it belongs.
Thermosetting Plastic
Thermoplastics
Look at the image and identify the group of plastics in which it belongs.
Thermosetting Plastic
Thermoplastics
Look at the image and identify the group of plastics in which it belongs.
Thermosetting Plastic
Thermoplastics
Plastics are ________ in weight.
Very heavy
Light
Neglible
Heavy
Pastics are _________
Conductors
Semiconductors
Conductors at room temperature only
Insulators
Which of the following materials cannot be recycled?
aluminium
plastic bags
glass bottles
Cartoon Boxes
Plastics are renewable resources
True
False
Plastics are very combustible
True
False
Plastic is bad for environment because :
They are non biodegradable
The harm aquatic life
They are a toxin carrier
All of these
Some characteristic properties of plastic are:
Plastic is non-reactive and non-corrosive
Plastic is light, strong and durable.
Plastics are poor conductors of electricity
All above answers are correct
Plastics differ from metals as they are:
Weaker
Harder to corrode
Softer
All the above
Give the name of the metal that contains iron.
(a)
Give the name of the metal that DO NOT contains iron.
(a)
Select the one that best defines a metal.
This is a metal that contains one type of element.
This is usually a solid material which is typically hard, opaque, shiny, and having conductivity.
These are metal that are composed of two or more metals.
This is a metal that does not contain iron
Select the one that best defines an alloy.
This is a metal that contains one type of element.
This is usually a solid material which is typically hard, opaque, shiny, and having conductivity.
These are metals that are composed of two or more metals.
This is a metal that does not contain iron
