Question 1: Name three common metals used in manufacturing and briefly describe one key property of each.

Answer: Steel: high strength and durability; Aluminum: lightweight and corrosion-resistant; Copper: excellent electrical conductivity.

Question 2: Explain why aluminum is often used in the construction of aircraft. What property makes it ideal for this purpose?

Answer: Aluminum is lightweight yet strong, which helps reduce the overall weight of the aircraft, improving fuel efficiency.

Question 3: Describe the process of making steel from iron ore. Include key steps involved.

Answer: The process involves extracting iron ore, then refining it in a blast furnace where coke, limestone, and iron ore are heated. The impurities are removed to produce pig iron, which is then converted into steel through further refining and alloying.

Question 4: You are designing a new kitchen utensil that needs to be both strong and resistant to rust. Which metal would you choose and why?

Answer: Stainless steel because it is strong, durable, and resistant to corrosion and rust.

Question 5: Sketch a simple design for a keyring made from a metal that is lightweight and easy to shape. Label the key features of your design.

Answer: A circular or oval shape with a small opening for keys, made from thin aluminum or a similar lightweight metal. The sketch should show a smooth, rounded shape with a clasp or hinge for attaching keys.

Question 6: Draw a cross-section of a metal rod that is used for structural purposes. Indicate the material and describe its typical use.

Answer: A simple cylindrical cross-section of a steel rod, used in construction frameworks or supports.

Question 7: Explain the difference between ferrous and non-ferrous metals, providing two examples of each.

Answer: Ferrous metals contain iron, such as steel and cast iron. Non-ferrous metals do not contain iron, such as aluminum and copper.

Question 8: Identify a metal that can be recycled repeatedly without losing quality. Why is recycling this metal important?

Answer: Aluminum; recycling conserves resources, reduces energy consumption, and minimizes environmental impact.

Question 9: Describe how the malleability of a metal affects its use in manufacturing. Give an example of a malleable metal and a product made from it.

Answer: Malleability allows a metal to be hammered or rolled into sheets or other shapes without breaking. An example is copper, used in electrical wiring and roofing materials.

Question 10: You need to design a decorative metal sculpture that involves bending and shaping. Which metal would you select and why?

Answer: Aluminum because it is lightweight, easy to bend, and holds shape well once formed.