Question 1: List three physical properties that are important when choosing a material for a kitchen knife handle. Explain why each property is important.

Answer: Possible properties include: durability (to withstand regular use), grip (to prevent slipping), and heat resistance (to avoid deformation when in contact with hot items).

Question 2: Describe the main differences between metals and plastics in terms of their strength and flexibility. Give an example of a product that uses each material.

Answer: Metals generally have higher strength and rigidity, making them suitable for load-bearing parts, e.g., steel in cutlery. Plastics tend to be more flexible and lightweight, suitable for items like plastic containers.

Question 3: A designer needs to create a lightweight bicycle frame that is strong and resistant to corrosion. Recommend two suitable materials and justify your choices.

Answer: Aluminium alloy (lightweight, corrosion-resistant, strong) and carbon fibre (very lightweight, high strength).

Question 4: Sketch a concept for a protective casing that needs to be lightweight, impact resistant, and insulating. Label the key features of your design.

Answer: A correct sketch would show a layered casing with an outer shell of impact-resistant plastic or rubber, an insulating inner layer of foam or thermal material, and possibly vents or grips. Labels should identify each layer and its purpose.

Question 5: Design a small storage container for perishable food that needs to keep items cold. Which material would you choose and why?

Answer: A suitable material would be polystyrene foam, because it has good insulative properties, is lightweight, and cost-effective.

Question 6: Explain how the properties of bamboo make it a sustainable material for furniture design. Include at least two properties in your answer.

Answer: Bamboo is fast-growing, making it renewable, and it is strong and lightweight, suitable for furniture. It also absorbs carbon dioxide, contributing to environmental sustainability.

Question 7: You are designing a waterproof outdoor lantern. Sketch your concept, showing the material choices for the body, handle, and seal. Include labels for each part explaining why you chose those materials.

Answer: A correct sketch would show a robust, impact-resistant plastic or rubber for the body, a heat-resistant plastic or metal for the handle, and rubber or silicone seals to ensure waterproofing. Labels should specify material types and reasons based on properties.

Question 8: Identify a suitable material for making a reusable water bottle that is both lightweight and durable. Justify your choice based on its properties.

Answer: Polypropylene plastic or stainless steel could be used. Both are lightweight and durable; stainless steel is also corrosion-resistant and has a good aesthetic appearance.

Question 9: Compare the thermal conductivity of ceramic and metal materials. How does this property affect their use in cooking utensils?

Answer: Ceramics generally have low thermal conductivity, meaning they heat slowly and evenly, making them ideal for cookware like baking dishes. Metals have high thermal conductivity, heating quickly and evenly, suitable for pots and pans.

Question 10: Design a conceptual plan for a lightweight, eco-friendly shopping bag. Sketch your design and specify the material you would use and why.

Answer: A sketch should show a bag made from recycled or biodegradable materials such as jute or recycled PET fabric. Labels should describe the material's sustainability, strength, and lightweight properties.