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To ensure that 95% of the user population can reach a control, the designer must design for the user with the shortest reach (the 5th percentile). If a 5th percentile user can reach the switch, then everyone with a longer reach (up to the 95th percentile and beyond) will also be able to reach it. Designing for the 95th percentile reach would mean only people with very long arms could reach it, excluding 95% of the population.

Award 1 mark for the correct option (A). No partial marks are awarded for multiple choice questions.

Dematerialization is the reduction of total material and energy throughput of any product and service, and thus its environmental impact. Replacing physical products (like CDs or physical maps) with digital services (like streaming or GPS apps) is a primary example of dematerialization.

Award 1 mark for the correct option (B). No partial marks are awarded for multiple choice questions.

Embodied energy is the sum of all energy required to produce any goods or services, considered as if that energy was incorporated or 'embodied' in the product itself. This includes raw material extraction, transport, processing, and assembly.

Award 1 mark for the correct option (C). No partial marks are awarded for multiple choice questions.

An instrumental model is a physical model that is equipped with sensors and used to take measurements and obtain quantitative data, such as aerodynamic drag in a wind tunnel or force during crash testing.

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To resist bending under load, the material must have high stiffness (resistance to elastic deformation). To return to its original shape without permanent deformation, it must have high elasticity (the ability to recover its original dimensions after unloading).

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Blow moulding is the standard manufacturing process for producing thin-walled, hollow plastic objects with narrow openings (such as bottles and containers) at high volumes.

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Technology transfer is the process of sharing of skills, knowledge, technologies, methods of manufacturing amongst industries, governments, or other institutions to ensure that scientific and technological developments are accessible to a wider range of users. Transferring knitting technology from the textile/sweater industry to footwear manufacturing is a classic example.

Award 1 mark for the correct option (B). No partial marks are awarded for multiple choice questions.

Ubiquity in classic design refers to the state of being everywhere. A ubiquitous product is one that has become so common, practical, and accepted that it can be found in almost every home, office, or public space, transcending its original era.

Award 1 mark for the correct option (C). No partial marks are awarded for multiple choice questions.

The popliteal height is the distance from the underside of the foot/heel to the underside of the thigh when sitting. This dimension directly determines the height of the seat so that the user's feet can rest flat on the floor, preventing pressure under the thighs. Stature is overall height, sitting height is for overhead clearance, and buttock-popliteal length determines seat depth.

Award 1 mark for the correct option (C). There are no partial marks for Paper 1 multiple-choice questions.

Dematerialization refers to the reduction of total material and energy throughput of any product and service, which includes replacing physical products with digital services (such as streaming music instead of buying CDs) or optimizing design to use fewer materials.

Award 1 mark for the correct option (A). No partial marks are awarded for multiple-choice questions.

Closed-loop recycling (or loop-to-loop recycling) occurs when a post-consumer product is recycled into the same or a very similar product without loss of quality (e.g., recycling aluminum cans back into aluminum cans). Downcycling involves recycling into a lower-quality material, and energy recovery is not a closed-loop recycling system.

Award 1 mark for the correct option (B). No partial marks are awarded for multiple-choice questions.

A high-fidelity physical prototype looks and functions very close to the final product, allowing designers to gather accurate qualitative feedback regarding tactile feel, weight, balance, and physical interaction which a digital 3D CAD model cannot fully replicate.

Award 1 mark for the correct option (C). No partial marks are awarded for multiple-choice questions.

Thermosetting plastics undergo a chemical change during curing where cross-links form between polymer chains. This makes them rigid and resistant to heat; they cannot be reheated and reshaped, unlike thermoplastics which can be repeatedly melted and reformed due to weak intermolecular forces.

Award 1 mark for the correct option (C). No partial marks are awarded for multiple-choice questions.

Quenching steel makes it extremely hard but also highly brittle, meaning it can easily crack under impact. Tempering involves heating the steel to a temperature below its critical point to relieve internal stresses, thereby reducing brittleness and restoring some toughness and ductility.

Award 1 mark for the correct option (B). No partial marks are awarded for multiple-choice questions.

A disruptive innovation is one that creates a new market and value network, eventually disrupting an existing market and displacing established market leaders, products, and alliances. Incremental improvements represent sustaining innovations.

Award 1 mark for the correct option (C). No partial marks are awarded for multiple-choice questions.

Ubiquity means that a product is omnipresent, found everywhere, and has sustained constant demand over a long period. This characterizes classic designs like the Bic Cristal pen which are widely accessible and globally integrated into daily life.

Award 1 mark for the correct option (D). No partial marks are awarded for multiple-choice questions.

Status in classic design refers to the social standing or prestige associated with owning a product. Classic designs often become status symbols that reflect the owner's taste and identity.

Award 1 mark for the correct answer B. Other options represent different characteristics of classic design (ubiquity, dominant design) or design cycles (obsolescence) that do not directly describe social prestige.

To act as an electrical insulator, the material requires high electrical resistivity (resisting the flow of electric current). To prevent heat transfer to the user's hand, it requires low thermal conductivity. Therefore, high electrical resistivity and low thermal conductivity is the correct combination.

Award 1 mark for the correct answer A. Any other combination would fail either the electrical safety or thermal comfort requirement.

Reusing refers to using a product or component multiple times for the same or a different purpose without changing its physical form. Cleaning and refilling empty bottles is a classic example of reuse.

Award 1 mark for the correct answer C. Recycling involves breaking down the material; reconditioning involves returning a used product to its original working order (often with part replacement); repairing involves fixing a fault.

The 5th to 95th percentile range accommodates 90% of the population. The 5% of the population below the 5th percentile are too small, and the 5% of the population above the 95th percentile are too large. Therefore, 5% of the population will be excluded because they are too large.

Award 1 mark for the correct answer A. 10% represents the total percentage excluded (both too small and too large). 90% represents the percentage accommodated. 95% represents the upper percentile cutoff value.

An aesthetic model is a model developed to look and feel like the final product, focusing on sensory appeal and exterior appearance rather than functional mechanisms.

Award 1 mark for the correct answer C. Instrument models measure physical behavior; mock-ups are used for ergonomic feedback/spatial layout; prototypes test functionality and technical concepts.

Disruptive innovation is an innovation that creates a new market and value network, eventually disrupting an existing market and displacing established market-leading firms and alliances.

Award 1 mark for the correct answer C. Sustaining innovation improves existing products; modular innovation changes components but leaves the architecture intact; process innovation refers to manufacturing or delivery improvements.

Extrusion is a manufacturing process used to create objects of a fixed cross-sectional profile by pushing material through a die of the desired shape. It is ideal for continuous profiles like pipes and conduits.

Award 1 mark for the correct answer D. Injection moulding is for complex 3D solid/hollow forms; blow moulding is for hollow containers; rotational moulding is for large, seamless hollow shapes.

Embodied energy is the total energy required to produce any goods or services, considered as if that energy were incorporated or 'embodied' in the product itself, from extraction to delivery.

Award 1 mark for the correct answer B. Other options refer to forms of energy (kinetic, thermal) or sources of energy (renewable) rather than the cumulative production energy metric.

Designing for clearance requires accommodating the largest users to ensure they do not bump their heads. Therefore, the 95th percentile male stature (or higher) is used as the primary design constraint. This ensures that 95% of males (and nearly 100% of females, who are statistically shorter on average) will clear the doorway comfortably.

Award [1] mark for the correct answer: D.
- Reject A: 5th percentile female is used for reach/accessibility limits, not clearance.
- Reject B: 50th percentile male leaves half of the male population unable to clear the doorway.
- Reject C: 95th percentile female would still exclude a large portion of the taller male population.

Dematerialization is the reduction of total material and energy throughput of any product and service, and thus the limitation of its environmental impact. Reducing the material thickness/weight of a bottle while maintaining performance is a classic example of dematerialization.

Award [1] mark for the correct answer: C.
- Reject A: Reconditioning involves repairing or renewing an existing product.
- Reject B: Recycling involves reprocessing waste material into new products.
- Reject D: Demanufacturing is the disassembly of a product to recover parts.

Computational fluid dynamics (CFD) is a virtual modeling tool that uses numerical analysis and algorithms to simulate and analyze how fluids (such as air) flow past solid boundaries, allowing designers to measure aerodynamic performance.

Award [1] mark for the correct answer: C.
- Reject A: Solid models represent the 3D geometry and volume but do not simulate fluid flows.
- Reject B: Surface models represent only the outer skin of the shape with no physical properties.
- Reject D: Finite element analysis (FEA) is used to calculate stress, strain, and structural deformation, not fluid dynamics.

Rotational moulding is ideal for producing large, hollow, one-piece plastic items. Powdered thermoplastic is heated inside a closed mould that rotates on two perpendicular axes, coating the inner walls evenly to produce a seamless, uniform hollow object.

Award [1] mark for the correct answer: C.
- Reject A: Injection moulding is suited for high-volume solid or thin-walled open parts with complex details, not large hollow closed structures.
- Reject B: Blow moulding is used for smaller, thin-walled hollow items like bottles.
- Reject D: Compression moulding is typically used for thermosetting materials in flat or shallow shapes.

Radical innovation involves the introduction of a completely new technology or business model that significantly changes or replaces existing markets and industries, creating an entirely new market paradigm.

Award [1] mark for the correct answer: B.
- Reject A: Incremental innovation involves minor improvements or refinements to existing products.
- Reject C: Architectural innovation reconfigures existing technologies into a new system.
- Reject D: Modular innovation changes a single component while leaving the rest of the architecture untouched.

Status and culture is a core characteristic of classic designs. Classic designs often reflect the cultural influence of the time they were created and become recognized as status symbols or icons of a particular lifestyle or national identity.

Award [1] mark for the correct answer: C.
- Reject A: Ubiquity refers to the design being omnipresent and found everywhere in daily life.
- Reject B: Dominant design refers to a design containing features that become the standard for all subsequent products.
- Reject D: Planned obsolescence is the deliberate design of products with a limited useful life, which is the opposite of a classic design's longevity.