Question 1: Identify three common metals used in household items and briefly explain one property that makes each suitable for its use.

Answer: Steel (strong and durable, suitable for construction); Aluminium (lightweight, ideal for aircraft); Copper (excellent electrical conductor, used in wiring).

Question 2: Describe a scenario where a metal with high malleability is preferred over one with high hardness. Explain your choice.

Answer: A metal with high malleability is preferred for shaping into thin sheets, such as in jewelry making, because it can be hammered or rolled into complex shapes without breaking.

Question 3: List two advantages and two disadvantages of using stainless steel in product design.

Answer: Advantages: Corrosion resistant, strong; Disadvantages: Heavier than aluminium, more expensive.

Question 4: Imagine you are designing a lightweight frame for a bicycle. Which metal would you choose and why? Provide at least two reasons.

Answer: Aluminium, because it is lightweight and resistant to corrosion, making it ideal for bicycle frames that need to be strong yet easy to handle.

Question 5: Sketch a simple plan for a small decorative box made from a metal sheet. Label the main parts, such as the base, sides, and lid.

Answer: A plan showing a rectangular base, four sides folded up from the edges, and a lid that overlaps slightly on the top edges. Labels should include 'base,' 'side panels,' and 'lid.'

Question 6: Explain the process of how you would join two pieces of metal together in a workshop. Mention at least two methods.

Answer: Methods include welding, which fuses the metals together using heat, and riveting, which uses metal pins to hold the pieces securely.

Question 7: Identify a metal that is commonly recycled and explain why recycling this metal is environmentally beneficial.

Answer: Aluminium is commonly recycled because it saves energy compared to producing new aluminium, reducing environmental impact.

Question 8: [CRITICAL THINKING] A company wants to design a durable, corrosion-resistant outdoor sign. Which metal would you recommend and why? Justify your answer.

Answer: I would recommend stainless steel because it is resistant to corrosion and weathering, making it ideal for outdoor use and ensuring longevity.

Question 9: Draw a cross-section of a metal wire used in electrical circuits. Show the wire's core and protective coating, and label each part.

Answer: A circular cross-section with an inner core (copper or aluminium) and an outer insulating coating. Labels should include 'core' and 'insulation.'

Question 10: Design a simple safety latch mechanism made from metal. Sketch your design and explain how it works.

Answer: A latch comprising a metal hook and a catch, where the hook can be rotated or slid into the catch to secure two parts together. The explanation should detail how the latch is engaged and released.