2024 IB DP Design technology 模擬試題連答案詳解

To ensure that the vast majority of the population can walk through a doorway without bumping their heads, designers must design for the tallest users. This corresponds to the 95th percentile of the taller demographic (males). Designing for the 5th percentile would exclude 95% of people, while the 50th percentile would exclude half of the population.

Award 1 mark for the correct option (C). Correct option identifies the 95th percentile male as the appropriate standard to accommodate height clearance. Incorrect options (A, B, D) would fail to accommodate taller users, leading to injury or discomfort.

Dematerialization refers to the reduction of the material and energy inputs required for a product. This involves reducing the physical amount of materials used in the product design itself without compromising its strength, quality, or functionality.

Award 1 mark for the correct option (C). Correct option directly defines dematerialization. Other options refer to energy efficiency (A), design for disassembly (B), and detoxification/substitution (D).

A mock-up is a physical model used primarily to test the aesthetic and ergonomic qualities of a product (such as size, grip, and user interface). Unlike prototypes, mock-ups are typically non-functional or only partially functional.

Award 1 mark for the correct option (B). A mock-up specifically addresses ergonomic and aesthetic layout testing without requiring functional internals. Reject A (scale model is typically for size/proportion and not always full scale), C (aesthetic model is focused purely on appearance), and D (instrument model is used for collecting quantitative data).

Hardness is the property of a material that enables it to resist plastic deformation, penetration, scratching, and indentation. It is tested using indentation methods like Rockwell, Brinell, or Vickers tests.

Award 1 mark for the correct option (D). Hardness is the specific resistance to indentation. Reject A (tensile strength is resistance to pulling forces), B (stiffness is resistance to elastic bending), and C (toughness is energy absorption before fracture).

Sustaining innovation involves making incremental improvements to existing products to keep them competitive in the market, without changing the fundamental structure of the industry or introducing entirely new business models.

Award 1 mark for the correct option (C). The scenario describes incremental, evolutionary improvements to an existing product line, which is a sustaining innovation. Reject A (architectural innovation changes how components link together), B (disruptive innovation targets new/low-end consumers), and D (radical innovation involves revolutionary new technologies).

The principle of 'form follows function' dictates that the aesthetic form of a product should be directly derived from and secondary to its practical function. Shaping a cantilever chair frame specifically to provide structure and comfort is a direct application of this principle.

Award 1 mark for the correct option (C). Option C describes a design decision driven purely by functional requirements (support and comfort). Options A, B, and D describe decisions where form is decorative or deceptive, which violates this principle.

Embodied energy is defined as the total cumulative energy consumed during the entire lifecycle of a material or product, starting from raw material extraction up to its delivery and installation.

Award 1 mark for the correct option (C). Embodied energy specifically measures the total life-cycle energy up to production. Reject A, B, and D as they refer to different physics-based energy concepts.

Blow moulding is the primary manufacturing technique for producing hollow, thin-walled thermoplastic components in high volumes, such as beverage bottles, where a parison is inflated inside a mould.

Award 1 mark for the correct option (B). Blow moulding is uniquely suited for hollow, high-volume bottle production. Reject A (injection moulding produces solid or open-shelled components), C (compression moulding is for thermosets), and D (rotational moulding is for larger, lower-volume hollow items).

To accommodate the largest practical portion of the population (typically 95%), designers use the range from the 5th percentile female (lower limit of reach and height) to the 95th percentile male (upper limit of clearance and fit).

Award 1 mark for identifying the 5th percentile female to the 95th percentile male range as the standard for adjustability design. Distractors: A is for single-user average design; C is too wide and economically/physically impractical; D is incorrect because combining the population without separating gender distributions can lead to inaccuracies at the extremes.

Dematerialization is the reduction of total material and energy throughput of any product or service. Reducing the wall thickness of a plastic beverage bottle while maintaining structural integrity is a direct reduction of material usage for the same utility.

Award 1 mark for selecting the option that demonstrates dematerialization (reducing material volume/weight while maintaining function). Distractors: A is material substitution; C is designing for disassembly; D is a change in energy source.

An instrumented physical model contains sensors (such as accelerometers or load cells) that gather quantitative data about physical forces, pressure, or impact, which is essential for testing protective safety equipment.

Award 1 mark for identifying the instrumented physical model. Distractors: A (aesthetic) is for appearance; B (mock-up) is for scale/space/ergonomic feel; D (scale model) is for size relationships and visualization.

Blow moulding is the primary commercial process used to manufacture hollow plastic components such as bottles by inflating a heated plastic parison inside a mould cavity.

Award 1 mark for identifying blow moulding as the correct process. Distractors: A (injection moulding) produces solid or open-container parts but not closed hollow ones; C (rotational moulding) is for large hollow parts and is slower; D (compression moulding) is typically for thermosets or simpler shapes.

Disruptive innovation disrupts an existing market and value network, eventually displacing established market-leading firms, products, and alliances (like traditional film photography).

Award 1 mark for selecting disruptive innovation. Distractors: A and B represent improvements to existing technologies/markets; D represents changes in the configuration of components but not a complete market disruption.

A classic design is characterized by its timeless appeal, permanent aesthetic value, and prolonged status as an iconic object that transcends its functional life and remains highly desirable across generations.

Award 1 mark for identifying timeless appeal. Distractors: A refers to advanced manufacturing, not classic design; C refers to green design/sustainability; D refers to affordable/mass market focus which is not a defining requirement of all classic designs (some are high-status luxury classics).

Tensile strength is a mechanical property because it describes how a material behaves when subjected to an external physical force (tension). Density, thermal conductivity, and electrical resistivity are physical properties.

Award 1 mark for identifying tensile strength as the mechanical property. Distractors: A, B, and D are all physical properties of materials.

Dynamic (or functional) anthropometric data measures physical dimensions in motion (such as reaching, walking, or bending), which is crucial for determining active reach zones and clearance during physical work tasks.

Award 1 mark for selecting dynamic anthropometric data. Distractors: A and C are synonyms for static/stationary measurements; D is a statistical method rather than a data type.

To accommodate 95% of the user population for reach, the designer must design for the 5th percentile of arm reach. If the lever is within the reach limit of a 5th percentile user (who has shorter arms), it will also be reachable by any user with a longer reach (which represents 95% of the population).

Award 1 mark for selecting 'a' (5th percentile).
Reject 'b', 'c', and 'd' as they do not safely ensure accessibility for 95% of users with shorter reaches.

This is remanufacturing. Remanufacturing involves disassembling a product, replacing worn parts, and returning the product to as-new performance specifications, usually with a warranty equivalent to that of a new product.

Award 1 mark for 'd' (Remanufacturing).
Reject 'a' (Recycling involves processing material), 'b' (Repairing is fixing only faulty parts without full disassembly), and 'c' (Reconditioning usually does not involve restoring to as-new performance with a full new warranty).

A scale model is a physical representation that is smaller or larger than the actual object. Scale models allow designers to test physical properties (like aerodynamic drag in a wind tunnel) without the high cost of building a full-sized prototype.

Award 1 mark for 'b' (Scale model).
Reject 'a' (Aesthetic models focus only on appearance), 'c' (Mock-ups are used for scale and proportion but lack the precise surface details for wind tunnel testing), and 'd' (Prototypes are fully functional, which is unnecessary and expensive for early wind tunnel testing).

Shape memory alloys (SMAs) can be deformed at lower temperatures and return to their pre-deformed shape when heated above their transition temperature (e.g., body temperature). This property makes them ideal for medical stents.

Award 1 mark for 'b' (Shape memory alloy (SMA)).
Reject 'a' (Piezoelectric materials generate electricity from mechanical stress), 'c' (Magnetorheological fluids change viscosity in a magnetic field), and 'd' (Photochromic pigments change color in response to light).

Radical innovation involves a completely new technology that replaces existing systems and creates an entirely new market, often disrupting established businesses and structures.

Award 1 mark for 'b' (Radical innovation).
Reject 'a' (Incremental innovation is small modifications), 'c' (Architectural innovation rearranges existing components), and 'd' (Modular innovation changes a component without changing the overall architecture).

Longevity in classic design refers to a product's ability to remain in demand and maintain its aesthetic/functional value over a long period of time, resisting obsolescence.

Award 1 mark for 'd' (Longevity).
Reject 'a' (Obsolescence refers to a product becoming outdated), 'b' (Ubiquity refers to being everywhere), and 'c' (Image refers to instant recognition, which is related but longevity is the specific characteristic of enduring over time).

Embedded energy (or embodied energy) is the sum of all the energy required to produce any goods or services, considered as if that energy were incorporated or 'embodied' in the product itself.

Award 1 mark for 'b' (Embedded energy).
Reject 'a', 'c', and 'd' as they are incorrect terms.

Blow molding is the most common and efficient process for producing hollow thermoplastic objects (such as bottles and play balls) in high volumes.

Award 1 mark for 'b' (Blow molding).
Reject 'a' (Injection molding is for solid/semi-open parts, not hollow sealed shapes), 'c' (Compression molding is for thermosets/semi-solid blanks), and 'd' (Vacuum forming is for open-shell sheets).

To ensure that a reach-related component can be accessed by 95% of the population, the design must accommodate the shortest users. If the 5th percentile user can reach the handle, then everyone taller (the remaining 95% of the population) will also be able to reach it. Designing for the 95th percentile would only accommodate those with longer reaches, excluding a significant portion of the population.

Award 1 mark for identifying the 5th percentile as the correct reach limitation criterion. Reject options suggesting 50th, 95th, or 99th percentiles, as these do not satisfy the reach requirements for shorter users.

Dematerialization refers to the reduction of total material and energy throughput of a product. Reducing the wall thickness of the plastic bottle directly reduces the volume of raw material used to perform the same function. Option A is material substitution. Option B is circular business model/take-back scheme. Option D is design for disassembly.

Award 1 mark for identifying the wall thickness reduction as dematerialization. Reject other options as they represent other distinct green design or circular economy strategies.

Solid modelling represents the solid volume of an object, containing both geometric boundaries and internal mass properties (such as density, mass, and center of gravity). This information is required for stress analysis and physical simulations. Wireframe and surface models do not contain internal mass/volume data, and haptic modelling refers to physical feedback interfaces.

Award 1 mark for selecting Solid modelling. Reject wireframe, surface, and haptic modelling as they lack the necessary mass and volume parameters required for the simulation.

Rotational moulding is ideal for producing large, hollow, stress-free plastic parts. Its tooling costs are relatively low compared to injection and blow moulding, making it highly cost-effective for low-volume runs of massive items like water tanks. Blow moulding is suited for high-volume, smaller hollow containers, injection moulding is not for large closed hollow shapes, and compression moulding is typically used for thermosets and non-hollow shapes.

Award 1 mark for selecting Rotational moulding. Reject alternative moulding methods because they are either technically unsuitable for large hollow containers or economically unviable for low production runs.

Technology transfer is the process of sharing skills, knowledge, technologies, and manufacturing methods from one sector or industry (e.g., military/scientific lasers) to another (e.g., consumer electronics/retail scanners).

Award 1 mark for identifying Technology transfer. Reject Market pull, Act of insight, and Analogy as they describe different invention triggers.

Longevity is the characteristic of classic designs that allows them to remain popular, functional, and in demand over several decades, resisting both functional and style obsolescence. While it may also possess status or omnipresence, the specific focus on enduring across time and resisting obsolescence is defined as longevity.

Award 1 mark for identifying Longevity. Reject other options because longevity specifically addresses the ability to resist obsolescence and remain relevant across generations.

Physiological factors relate to physical performance, human body limitations, and biomechanical capabilities. For a hand-held power drill, important physiological considerations include:
1. The muscle strength and endurance required to hold and trigger the drill, which affects fatigue and strain.
2. The vibration generated by the tool, which can lead to hand-arm vibration syndrome (HAVS) if not mitigated.

Award [1] for each correct physiological factor identified, up to [2] marks.
- Muscle fatigue / grip force requirements [1]
- Hand-arm vibration / resonance impact on nerves and joints [1]
- Weight/torque strain on the wrist [1]
Do not accept anatomical factors (e.g., hand size) or cognitive factors (e.g., ease of understanding labels).

Dematerialization involves reducing the total material and energy throughput of a product and its packaging. By redesigning packaging to use thinner material plies or eliminating excess layers, fewer natural resources are consumed. Furthermore, lighter and more compact packaging reduces the fuel consumption and carbon footprint during transportation and distribution, while also generating less post-consumer waste.

Award [1] for explaining how dematerialization reduces material usage in packaging design (e.g., thinner cardboard, eliminating inner plastic layers).
Award [1] for linking this reduction to a specific environmental benefit (e.g., lower carbon footprint in distribution, decreased resource depletion, or reduced volume of waste going to landfill).

Renewability is focused on the input stage of a material's life cycle. It ensures that the resource used (such as bamboo or sustainably harvested timber) is naturally replenished on a human timescale. Recyclability is focused on the output (end-of-life) stage of the product's life cycle. It ensures that the physical material (such as PET plastic or aluminum) can be captured, processed, and remanufactured into new products rather than being disposed of as waste.

Award [1] for a clear definition of renewability focusing on resource replenishment at the input stage.
Award [1] for a clear definition of recyclability focusing on reprocessing waste materials into new materials at the end-of-life stage.

While CAD models are highly effective for visual analysis, digital anthropometric clearance checks, and static structural simulations, they lack physical presence. Test subjects cannot physically interact with or sit on a digital model. This means qualitative physical data—such as tactile comfort, localized pressure points, heat dissipation of upholstery, and the intuitive feel of adjusting levers under load—cannot be tested reliably without a physical prototype.

Award [1] for identifying a valid limitation of virtual prototyping (e.g., lack of physical/tactile presence, inability to physically sit on the model).
Award [1] for explaining why this limitation affects the evaluation of ergonomic comfort (e.g., cannot assess body pressure distribution, tactile feel of fabrics, or dynamic muscle strain).

Timber-based composite materials like MDF are highly suitable for flat-pack furniture because:
1. They are isotropic, meaning their properties are uniform in all directions, preventing them from warping or splitting along a grain line.
2. They do not contain natural defects like knots, splits, or shakes, ensuring high material yield and consistency across large sheets, which is critical for precision CNC routing.

Award [1] for each valid advantage stated, up to [2] marks.
- Isotropic properties / dimensional stability (does not warp, twist, or split) [1]
- No natural defects (knots, grain variances) [1]
- Availability in large, consistent, flat sheets [1]
- Easier to join/machine uniformly using automated CNC processes [1]

Smartphone components require extremely tight tolerances, thin walls, and a pristine surface finish. Sand casting uses a granular mold that yields rough surfaces, thick wall sections, and low dimensional precision, requiring extensive machining. High-pressure die casting forces molten aluminum into reusable steel dies at high pressure. This ensures precise replication of minute features, incredibly thin structural sections, an excellent surface finish, and a very short cycle time, making it highly economical for millions of units.

Award [1] for identifying a benefit of high-pressure die casting (e.g., precise dimensional tolerance, excellent surface finish, ability to cast thin walls, or rapid production rate).
Award [1] for explaining why this benefit is critical for smartphone mass production compared to the limitations of sand casting (e.g., fits tight electronic assemblies without extensive secondary machining, or meets the high volume demands of consumer markets).

In product design, architectural innovation keeps the core components of the system relatively unchanged but reorganizes how they connect or interact (e.g., moving a car's engine from the front to the middle). In contrast, modular innovation replaces or completely changes the core design of a specific module or component with a new technology, but keeps the overall structure and linkages of the product the same (e.g., replacing an analog clock with a digital display in a standard dashboard layout).

Award [1] for describing architectural innovation (focus on reconfiguration of existing components/linkages).
Award [1] for describing modular innovation (focus on changing individual modules/components while keeping the product architecture/linkages constant).

Ubiquity refers to the state of being constant, widespread, and everyday. When a product is ubiquitous (such as the Vespa scooter or the Bic ballpoint pen), it is continuously used and seen by millions. This constant exposure integrates the product into popular culture and daily life, establishing a sense of timeless familiarity, reliability, and status that elevates it to a classic design.

Award [1] for defining ubiquity in design terms (widespread presence, mass market penetration, constant everyday use).
Award [1] for linking this presence to the attainment of classic design status (creates deep cultural resonance, timeless appeal, and multi-generational recognition).

Designing for the 50th percentile means only those of average size are accommodated, making the chair uncomfortable or unusable for those who are taller, shorter, heavier, or lighter. By utilizing the 5th to 95th percentile range, the designer accommodates 90% of the user population through built-in adjustability (e.g., seat height, armrests), ensuring ergonomic safety and comfort for a vastly larger market.

[1 mark] For explaining that the 50th percentile only accommodates the median user, excluding half of the population who are larger/smaller. [1.14 marks] For explaining that the 5th to 95th percentile accommodates 90% of the user population, allowing the chair to be adjustable for a wider range of physical sizes.

Life cycle analysis (LCA) is a systematic tool that assesses the environmental impacts associated with all stages of a product's life cycle (cradle-to-grave). By analyzing these stages, a manufacturer can identify specific areas of high energy use, toxic emissions, or material waste. This allows them to make informed decisions to reduce impact, such as choosing recyclable materials, optimizing manufacturing efficiency, or designing for disassembly.

[1 mark] For defining LCA as assessing environmental impacts across all stages of a product's life. [1.14 marks] For explaining that identifying high-impact areas (hotspots) allows manufacturers to implement targeted design improvements (e.g., material substitution, design for disassembly).

An instrumented physical model is fitted with sensors (such as accelerometers or pressure sensors) that collect objective, quantitative data on forces and impact distribution during testing. This allows the designer to scientifically evaluate the safety performance of the helmet. In contrast, a high-fidelity aesthetic model is designed to look like the final product but lacks functional testing capability, making it unsuitable for safety verification.

[1 mark] For identifying that instrumented models contain sensors to collect quantitative physical data (e.g., impact forces). [1.14 marks] For contrasting this with aesthetic high-fidelity models which only evaluate visual appearance and form, and cannot test functional safety performance.

After carbon steel is hardened by quenching, it becomes extremely hard but highly brittle, making it prone to cracking or shattering under stress. Tempering involves reheating the hardened steel to a precise, lower temperature and then cooling it. This process reduces excessive hardness and internal stresses, thereby significantly increasing the toughness and ductility of the tool, making it durable enough for practical use.

[1 mark] For stating that tempering reduces brittleness and internal stresses caused by hardening. [1.14 marks] For explaining that this increases the toughness and ductility of the steel, making the tool more durable and resistant to fracturing under impact.

Technology push occurs when a smartphone manufacturer develops new features or devices based on breakthroughs in R&D (e.g., the introduction of flexible folding screens) before a consumer demand exists. Market pull occurs when the manufacturer responds directly to consumer needs or market trends, such as developing longer battery life or improved water-resistance because customers are actively demanding these features.

[1 mark] For defining technology push as innovation driven by new technological capability/R&D without initial consumer demand. [1.14 marks] For defining market pull as innovation driven by existing customer needs or market demand, and illustrating the difference with appropriate smartphone examples.

When a classic design is classified as 'form follows function', it means the product's aesthetic shape, materials, and layout are entirely derived from its intended task or performance requirements. For example, the Bauhaus-designed nesting tables or the Anglepoise lamp have highly functional joints and minimalist structures where no decorative elements are added purely for style. If it were 'function follows form', aesthetics would dictate the design first, and functionality would be secondary or constrained by that shape.

[1 mark] For explaining that 'form follows function' prioritizes usability and mechanical operation, letting these dictate the shape and aesthetics. [1.14 marks] For contrasting this with 'function follows form' where aesthetics are prioritized first, and functional parts are adapted to fit that aesthetic shell.

Dematerialization involves designing a product to use less material overall without sacrificing its function or performance. 1. By using thinner, highly engineered walls, the designer reduces the raw material required per cup. 2. Incorporating integrated structural ribs instead of thick walls maintains durability while reducing plastic weight. 3. Designing an integrated double-wall structure for thermal insulation eliminates the need for separate silicone sleeves, thereby reducing the number of components and material types. 4. Lightweighting the cup decreases the energy needed for transport and distribution throughout its product life cycle. 5. Using fewer materials simplifies the end-of-life recycling process, aligning with circular economy principles.

Award 1 mark for a clear definition of dematerialization in the context of the product. Award up to 4 marks for explaining specific ways dematerialization reduces environmental impact: 1 mark for material reduction via wall thickness optimization; 1 mark for structural integration (such as removing extra sleeves); 1 mark for reducing transport emissions through lightweighting; 1 mark for simplifying recycling/end-of-life disposal due to fewer materials.

Temperate hardwoods possess several key properties that make them highly suitable for public outdoor benches. 1. High density and hardness provide excellent resistance to wear, scratching, and vandalism, which are common in high-use public spaces. 2. The close grain structure of hardwoods makes them naturally resistant to moisture penetration, reducing the risk of warping or splitting when exposed to weather elements. 3. Many temperate hardwoods contain natural oils and tannins that resist fungal decay and insect attack, eliminating the need for toxic chemical preservatives often required for softwoods. 4. Their high tensile and compressive strength allows for slimmer, more elegant structural designs that can still support heavy public loads. 5. Hardwoods age gracefully, developing a weathered patina without degrading structurally, which minimizes long-term municipal maintenance costs.

Award 1 mark for identifying a relevant property such as hardness, density, or natural decay resistance. Award up to 4 marks for explaining how these properties relate to the public outdoor context: 1 mark for durability and resistance to vandalism or physical wear; 1 mark for weather resistance and moisture stability preventing structural deformation; 1 mark for natural resistance to biological degradation without chemical treatment; 1 mark for structural strength supporting heavy loads over time.

To design an ergonomic office chair that fits a wide range of users, designers rely on anthropometric percentile data. 1. Designers use percentiles to define the extremes of the user population, typically aiming to accommodate the 5th to 95th percentiles. 2. This range ensures that 90 percent of the target population can safely and comfortably use the chair. 3. The 5th percentile female data is used to determine the minimum limit of the seat height and depth, ensuring that shorter users can rest their feet flat on the floor and sit without pressure behind their knees. 4. The 95th percentile male data is used to determine the maximum limit of seat height, backrest height, and armrest width, ensuring taller users are adequately supported. 5. The adjustability mechanism (such as a gas lift or sliding seat pan) is engineered to smoothly span the exact gap between these two percentile limits, preventing the need for custom-built chairs.

Award 1 mark for defining percentiles or the 5th to 95th percentile range (accommodating 90 percent of users). Award up to 4 marks for detailed explanation: 1 mark for identifying the lower limit (5th percentile female) and its ergonomic benefit; 1 mark for identifying the upper limit (95th percentile male) and its ergonomic benefit; 1 mark for explaining how adjustability bridges these two extremes; 1 mark for linking this approach to mass production efficiency.

The development of a groundbreaking fitness tracker often arises from the intersection of technology push and an act of insight. 1. Technology push occurs when scientific research or technological advancement makes a new component available, such as highly accurate, ultra-miniaturized photoplethysmography (PPG) optical sensors. 2. This technology is pushed onto the market by manufacturers looking for applications, rather than being pulled by direct consumer demand. 3. An act of insight occurs when a designer has a sudden creative leap or eureka moment, recognizing how to apply this new sensor technology in a novel way. 4. For example, the designer might realize that this sensor can be integrated into a sleek ring rather than a bulky wristband to monitor sleep patterns unobtrusively. 5. The interaction of these two forces results in an innovative product that defines a new market niche, combining technical capability (push) with a creative, user-centric application (insight).

Award 1 mark for clearly defining technology push. Award 1 mark for clearly defining act of insight. Award up to 3 marks for explaining their interaction: 1 mark for describing how the technological breakthrough provides the raw capability; 1 mark for describing how the creative leap (act of insight) applies that capability to a real-world user scenario; 1 mark for explaining how this synergy leads to a successful, innovative product that stands out in the marketplace.