Introduction to Materials

15 Grade 7 Pre-Technical Studies questions on Introduction to Materials, with worked marking schemes. 15 questions are available on this topic in full.

1. Question 1

   1 mark

   A learner needs a material to make electrical wiring at home. Which property is MOST important?

   A. Good electrical conductivity

   B. Low density only

   C. High brittleness

   D. Attractive colour

   (1 mark)

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2. Question 2

   1 mark

   A learner is sorting materials in the workshop into groups. Which of the following is the correct way to classify materials?

   A. Into metallic and non-metallic materials

   B. Into expensive and cheap materials only

   C. Into old and new materials only

   D. Into heavy and light materials only

   (1 mark)

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3. Question 3

   1 mark

   Which of the following materials is BEST suited for making window panes because it is transparent?

   A. Steel

   B. Rubber

   C. Glass

   D. Timber

   (1 mark)

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4. Question 4

   4 marks

   (a) Differentiate between metallic and non-metallic materials.

   (b) Give one example of each.

   (4 marks)

   Marking scheme

   (a) 2 marks: Metallic materials are made of/contain metals, are usually shiny, good conductors of heat and electricity and can be melted and reshaped; non-metallic materials are not metals, are generally poor conductors and include wood, plastics, glass, rubber. (b) 1 mark each: metallic e.g. iron/aluminium/copper; non-metallic e.g. wood/plastic/glass/rubber.

5. Question 5

   6 marks

   State three properties you would consider when selecting a material for making a cooking pot, giving a reason for each.

   (6 marks)

   Marking scheme

   3 x (property 1 mark + reason 1 mark): Good heat/thermal conductivity - transfers heat quickly to cook food; High melting point/heat resistance - does not melt on the fire; Non-toxic/does not react with food - keeps food safe; Durable/strong - withstands regular use; Malleable - can be shaped into a pot. Any 3 with reasons.

6. Question 6

   1 mark

   A material that breaks easily without bending when hit is said to be

   A. tough

   B. malleable

   C. brittle

   D. ductile

   (1 mark)

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7. Question 7

   1 mark

   Materials are classified as either metallic or non-metallic. Which of the following is a metallic material?

   A. Rubber

   B. Ceramic

   C. Wood

   D. Aluminium

   (1 mark)

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8. Question 8

   4 marks

   A carpenter wants to store timber so that it does not rot. Explain two ways of protecting or preserving materials from damage in the workshop.

   (4 marks)

   Marking scheme

   2 points x 2 marks: Store in a dry, well-ventilated place to prevent moisture/rotting; Apply protective coatings e.g. paint/varnish/oil to prevent rust or decay; Keep away from insects/termites using preservatives; Stack timber properly off the ground to allow air circulation. Any 2 explained.

9. Question 9

   1 mark

   Which pair correctly matches a metal to its common use?

   A. Glass - hammer heads

   B. Copper - electrical wires

   C. Rubber - roofing sheets

   D. Wood - electrical cables

   (1 mark)

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10. Question 10

    1 mark

    Which of the following is an example of a natural material?

    A. Timber

    B. Glass

    C. Plastic

    D. Nylon

    (1 mark)

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11. Question 11

    1 mark

    The property of a material that allows it to return to its original shape after a stretching force is removed is called

    A. conductivity

    B. hardness

    C. elasticity

    D. malleability

    (1 mark)

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12. Question 12

    4 marks

    Explain the meaning of the following material properties: (a) Malleability (b) Hardness.

    (4 marks)

    Marking scheme

    2 marks each: (a) Malleability - the ability of a material to be hammered, rolled or pressed into thin sheets without breaking/cracking. (b) Hardness - the ability of a material to resist scratching, wear, indentation or cutting.

13. Question 13

    1 mark

    A workshop teacher describes a material that can be drawn into thin wires. This property is known as

    A. brittleness

    B. transparency

    C. ductility

    D. elasticity

    (1 mark)

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14. Question 14

    1 mark

    Ferrous metals are those that

    A. are always non-magnetic

    B. are only found in plastics

    C. do not contain any iron

    D. contain iron and are usually magnetic

    (1 mark)

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15. Question 15

    1 mark

    In the workshop a learner is sorting items into groups. Wood, plastic and rubber are placed together away from steel and aluminium. On what basis are the materials most likely being grouped?

    A. By their colour

    B. Into metallic and non-metallic materials

    C. By their price

    D. By the country they came from

    (1 mark)

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