Processed materials

1. 1Many processed materials have been made for a

   1. Aparticular purpose
   2. Bperson
2. 2Wood is a strong material as long as

   1. Athe load is at right angles to the wood fibres. If you put the load in same direction the wood can split
   2. Bwood is layed down in checkerboard pattern
3. 3Concerete is strong when a load pushes [blank_start]downwards[blank_end]. It can break with pulling fordes that is why a reinfocing rod is insert in the lower part thwere the pulling forces act.

   1. Adownwards
   2. Bsideways
4. 4Glass and ceramic are strong but [blank_start]brittle[blank_end]. They can [blank_start]break[blank_end] easily.

   1. Abrittle
   2. Bbreak
5. 5Durable materail can withstand

   1. Awear and tear over long periods
   2. Brust
6. 6Kevlar is a strong material used in bulletproof vests because it is

   1. Alight
   2. Bdoes not rust
7. 7When was fibreglass first used and for what

   1. A1923 plastic dishes
   2. B1960 sailboats
8. 8If material is fire resistant. This means it does not burn.

   1. AVerdadeiro
   2. BFalso
9. 9Kevlar is fire retardant. This means it burns very slowly so you can get the bulletproof jacket off.

   1. AVerdadeiro
   2. BFalso
10. 10Some building include fire retardent materails like

    1. Aplastic
    2. Bcement and certain fibres

11. 11People in Africa have been processing materials for years.

    1. ACombining soil to make clay pots and bricks. Weaving baskets, hats, mats and thatched roof from plant fibres.
    2. BCreating bows and arrows
12. 12You can make clay pots by pressing coils of clay together. Smoothing them over.

    1. AVerdadeiro
    2. BFalso
13. 13Who is Nesta Nala.

    1. AFamous singer
    2. BFamous potter
14. 14To make clay pots strong they must be

    1. Apainted
    2. Bheated in a fire or kiln
15. 15Things need to be made from materials that have suitable

    1. Aappearances
    2. Bproperties
16. 16What happens when you heat a strong material like plastic

    1. AIt becomes stronger and solidifies
    2. BMaterial melts and becomes weak
17. 17What are coils of clay

    1. APots that have been heated in a Kiln
    2. BRopes of clay wound around in a circular fashion
18. 18Materials are processed to become waterproof. Like a raincoat. The fabric is usually process with ruber or plastic. The raincoat is shiny. This prevents

    1. Aexposure to the fibres of the material
    2. Byou getting wet in the rain as it protects your body. Water just slips off.
19. 19Many other uses of waterproofing. Like a house. Damp proof material is placed on the floor to prevent

    1. Afloor cracking
    2. Bwater seeping in and damaging and wetting the walls
20. 20Waterproof materials used today are

    1. Arubber and fibreglass
    2. Bflour and water
21. 21When paint hardens we say it is

    1. Acracked
    2. Bwaterproof
22. 22What is fire retardant. Is it that the material burns very slowly and fire resistant means it does not burn at all.

    1. AVerdadeiro
    2. BFalso

Descrição

4 Grade 5 Natural Science (Tests- Term 2) Quiz sobre Processed materials, criado por Celestine Thomson em 22-05-2017.

Autor

Celestine Thomson

Idioma

English

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grade 5 natural sciencetests- term 24

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