LESSON 8 EXAM

1. Thermosets are:

Metals

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Polymers

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Natural materials

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Liquids

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2. Thermosets are plastic materials which:

Can be remolded after heating

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Cannot be affected by the application of heat

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Melt easily

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Are very flexible

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3. When thermosets are heated, they:

Can be remolded

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Set permanently and cannot be remolded

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Become liquid

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Evaporate

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4. Examples of thermoset products include:

Plastic plates and buckets

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Plastic handles of cooking utensils and knives

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Plastic cups

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Plastic containers

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5. Thermoset products also include:

Telephone parts

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Plastic buckets

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Plastic bottles

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Plastic bags

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6. Plastics are:

Very heavy

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Very light

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Medium weight

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Heavier than metals

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7. The price of plastics is:

Very expensive

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Very cheap

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Same as gold

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Higher than metals

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8. Plastics are:

Conductors of electricity

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Semi-conductors

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Insulators

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Magnets

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9. Plastics are:

Easily corroded

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Corrosion resistant

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Prone to rust

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Affected by water

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10. One advantage of plastics is that they are:

Heavy

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Lightweight

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Expensive

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Difficult to produce

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11. Plastics can be:

Moulded into different shapes and sizes

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Used in one shape only

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Never reshaped

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Only used as sheets

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12. Plastics are:

Very expensive to produce

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Relatively inexpensive to produce

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Impossible to produce

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Only produced in small quantities

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13. One disadvantage of plastics is that:

They are too heavy

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They are too expensive

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Some produce poisonous flames when burnt

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They conduct electricity

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14. Another disadvantage of plastics is that they:

Are too strong

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Litter the surroundings

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Are too expensive

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Cannot be molded

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15. Rubber is a:

Metal product

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Non-metal product

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Ceramic product

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Glass product

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16. Rubber looks like plastics but is:

Heavier than plastic

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More elastic than plastic

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Harder than plastic

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Less flexible than plastic

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17. Rubber can be:

Stretched easily

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Broken easily

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Melted easily

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Compressed only

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18. When rubber is released after being stretched, it:

Breaks

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Remains stretched

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Returns to its original length

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Becomes longer

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19. Rubber:

Allows water to pass through it

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Does not allow water to pass through it

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Absorbs water

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Dissolves in water

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20. When placed in water, rubber:

Sinks

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Floats

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Dissolves

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Breaks apart

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21. How many types of rubber are there?

One

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Two

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Three

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Four

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22. The two types of rubber are:

Hard and soft rubber

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Natural and synthetic rubber

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Heavy and light rubber

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Colored and colorless rubber

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23. Natural rubber comes from:

Petroleum

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A milky liquid called latex

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Metal ore

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Sand

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24. Latex is extracted from:

Metal

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The rubber tree

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Plastic

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Glass

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25. Synthetic rubber is produced from:

Rubber trees

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Organic material derived from petroleum

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Metal ore

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Clay

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26. Rubber is used to make:

Tyres for vehicles

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Hand gloves

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Electrical insulation

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All of the above

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27. Rubber can be used to make:

Buckets and rain coats

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Rain boots and catapults

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Both a and b

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None of the above

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28. Rubber can be used as:

An elastic

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Water proof material

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Shock absorber

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All of the above

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29. How many methods can be used to process plastic?

Three

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Four

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Five

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Six

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30. Methods of processing both plastic and rubber include:

Vacuum forming and extrusion

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Calendaring and compression moulding

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Both a and b

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None of the above

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LESSON 8 EXAM

LESSON 8 EXAM

ola October 29, 2025

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