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Materials and Processes

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  • Why do we use alloys?
    To improve strength or corrosion resistance.
  • Name 3 metals that don't rust easily.
    Aluminium, copper, stainless steel.
  • Name 3 metals that are magnetic.
    Iron, cobalt, nickel
  • What does 'ductile' mean?
    Can be stretched into wires, e.g., copper.
  • Name 3 uses of aluminium.
    Cans, cables, planes.
  • What does forging do to metal?
    Strengthens and refines its structure.
  • Name 3 metals used in electrical engineering.
    Copper, aluminium, steel
  • Which process involves molten metal?
    Casting - pouring liquid metal into moulds.
  • True or False: Tough materials break easily.
    False - they absorb energy without breaking.
  • Why is aluminium used in power lines?
    It's light, strong, and conducts electricity well.
  • True or False: Copper is a poor conductor.
    False - it's one of the best conductors of electricity.
  • What does 'brittle' mean?
    Breaks easily without bending — like glass.
  • Which material is more brittle: glass or steel?
    Glass.
  • Name 3 non-ferrous metals.
    Aluminium, copper, brass
  • Name 3 applications of copper.
    Wires, motors, plumbing - good conductor and durable.
  • Why are insulators important in cables?
    They prevent electric shocks and short circuits.
  • Which process strengthens metal by hammering?
    Forging - improves toughness.
  • Why are metals shiny?
    They reflect light well due to free electrons.
  • Give an example of a malleable material.
    Gold can be hammered into thin sheets.
  • Fill in the gap: Steel is ______ than aluminium.
    Heavier
  • True or False: Extrusion involves melting and forcing through a die.
    True - it produces rods, pipes, and cables.
  • True or False: Plastic conducts electricity.
    False
  • Name 3 materials that are flexible.
    Rubber, nylon, plastic
  • Which process produces metal sheets?
    Rolling.
  • Fill in: A ______ is used to pour molten metal into a shape.
    Mould - used in casting.
  • True or False: Steel is lighter than aluminium.
    False
  • Why is aluminium used for aircraft?
    It's light but strong saves fuel.
  • Which property makes materials suitable for springs?
    Elasticity - ability to return to shape.
  • What would happen if we made cables from wood?
    No electricity - wood is an insulator!
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