Question 1: Explain three important factors to consider when selecting a material for a lightweight, portable water bottle.

Answer: Factors include weight (lightweight materials), durability (resistance to impact and leaks), safety (non-toxic, food-grade materials), and cost. Also consider ease of cleaning and environmental impact.

Question 2: Describe the key properties of a suitable material for making a heat-resistant baking tray.

Answer: The material should have high thermal resistance, good heat conduction, be non-toxic, and resistant to warping or melting at high temperatures.

Question 3: Design Brief: You need to create a protective case for a smartphone that will be used outdoors and in rough conditions. Which material would you choose and why?

Answer: A suitable choice might be a durable, impact-resistant material such as silicone or thermoplastic polyurethane (TPU). These materials absorb shocks, are waterproof, and provide good grip, protecting the phone during outdoor use.

Question 4: Sketch a simple design for a lightweight, foldable shopping basket. Label the materials you would use for the handle and the main body.

Answer: The sketch should show a foldable design with a handle made of lightweight metal or plastic for strength and ease of carrying. The main body could be made of flexible plastic or woven material for collapsibility. Labels should specify these materials.

Question 5: List three properties that make steel a popular choice for manufacturing cutlery.

Answer: Hardness (sharpness and durability), corrosion resistance (stainless steel), and ease of cleaning.

Question 6: In a scenario where a product needs to be biodegradable after disposal, which materials would be most appropriate? Provide two examples and justify your choices.

Answer: Bioplastics made from renewable resources like cornstarch or sugarcane, and paper-based materials. These are biodegradable because they break down naturally in the environment, reducing pollution.

Question 7: Describe the advantages and disadvantages of using aluminium for making a bicycle frame.

Answer: Advantages include being lightweight, corrosion-resistant, and strong. Disadvantages include higher cost compared to steel and potential fatigue over time.

Question 8: Draw a sketch of a product that uses flexible plastic for its outer shell. Show the outer shape and indicate the material with labels. Include features that demonstrate flexibility.

Answer: The sketch should depict a soft, bendable outer shell, possibly with a curved, ergonomic shape. Labels should specify 'Flexible Plastic' and highlight areas that can bend or deform without breaking.

Question 9: Explain why glass is often used for packaging food and beverages, considering its material properties.

Answer: Glass is non-reactive, ensuring no chemical contamination; it is impermeable to gases and liquids, preserving freshness; and it is recyclable, making it environmentally friendly.

Question 10: Identify a material suitable for making outdoor furniture that needs to withstand weather conditions. Justify your choice.

Answer: Teak wood or aluminum are suitable; teak is naturally resistant to moisture and pests, while aluminum is resistant to rust and corrosion, making both durable for outdoor use.