2023 CCEA AS-Level Technology and Design 8900 模擬試題連答案詳解

(a) A thermoplastic is a polymer that softens when heated and can be reshaped or remoulded; crucially, this softening and reshaping can be repeated multiple times through further heating and cooling cycles. A thermosetting plastic, in contrast, undergoes a permanent chemical (cross-linking) change the first time it is heated and cured/set, after which it cannot be softened or reshaped again, even if reheated.

(b) High-density polyethylene (HDPE) is a thermoplastic commonly used to manufacture products such as bottles, buckets and plastic pipes.

(c) HDPE is tough, resistant to impact damage, and resistant to moisture and many chemicals, all properties that make it well suited to durable containers such as bottles and buckets that must survive repeated handling and contact with liquids.
Final answer: (a) a thermoplastic softens and can be reshaped/remoulded when heated (and can be reheated and reshaped repeatedly), whereas a thermosetting plastic undergoes a permanent chemical change when first heated/cured and cannot be softened or reshaped again by further heating; (b) e.g. high-density polyethylene (HDPE), used to make bottles/buckets/pipes; (c) e.g. HDPE is tough and resistant to impact, or resistant to chemicals/moisture, making it suitable for containers

(a) [1] thermoplastic softens/can be reshaped when heated, can be repeated; [1] thermosetting plastic undergoes a permanent change and cannot be reshaped again. [2]
(b) [1] valid named thermoplastic; [1] valid, correctly matched product. [2]
(c) [1] valid property correctly linked to the named product. [1]
Total [5].

1. Oak is naturally durable, with good natural resistance to rot and decay. This matters for outdoor garden furniture because it is constantly exposed to rain, damp and changing weather conditions, which would cause a less durable timber to rot and fail much more quickly.

2. Oak is a strong, hard hardwood. This matters for garden furniture because it must support the loads of people sitting or leaning on it, and withstand everyday knocks and general outdoor use, without denting, splitting or breaking.
Final answer: 1. oak is naturally durable and has good resistance to rot/decay when exposed to outdoor weather conditions, so furniture made from it lasts longer outdoors without treatment failing; 2. oak is a strong, hard hardwood, able to withstand the loads and everyday knocks of outdoor furniture use without denting or breaking easily

[1] each for any two valid properties of oak (e.g. durability/rot resistance, strength/hardness, attractive grain/appearance), to a maximum of [2]; [1] each for a linked justification explaining why that property suits outdoor garden furniture specifically, to a maximum of [2]. Total [4].

(a) Aluminium has a low density relative to its strength (a good strength-to-weight ratio), meaning a bicycle frame made from it is lightweight, making the bicycle easier for the rider to pedal, accelerate and carry, while still being strong enough to safely support the rider's weight and the stresses of cycling.

(b) Anodising is an electrolytic surface finishing process that thickens and hardens the naturally occurring oxide layer on the surface of aluminium. The purpose of this is to significantly improve the product's resistance to corrosion and surface wear compared with untreated aluminium, and the process can also be used to add a durable, decorative colour to the finished product.
Final answer: (a) aluminium has a low density (is lightweight) relative to its strength, so a bicycle frame made from it is light enough for the rider to pedal and carry easily, without sacrificing sufficient strength; (b) anodising forms a hard, corrosion-resistant oxide layer on the surface of the aluminium (through an electrolytic process), protecting the underlying metal from corrosion and wear, and can also add colour to the product

(a) [1] valid property (e.g. low density/lightweight, good strength-to-weight ratio); [1] linked justification relevant to bicycle frames. [2]
(b) [1] correctly identifies anodising forms/thickens a protective oxide layer; [1] correctly explains the purpose (corrosion/wear resistance, and/or decorative colouring). [2]
Total [4].

(a) Graphene is a two-dimensional material formed from a single layer of carbon atoms. Despite this extreme thinness, it is exceptionally strong, highly flexible, and an excellent conductor of electricity. This unusual combination of properties makes it well suited to flexible electronic displays: because it can conduct electricity while also being thin and flexible enough to bend repeatedly without breaking, it can be used as the transparent conductive layer within a display, allowing the whole display to flex or bend as part of the product's design, which a rigid, brittle conductive material could not achieve.

(b) Shape memory alloys are a smart material that can be 'trained' to return to a pre-set original shape when heated (or, for some types, after being deformed), even after being bent or deformed. One application in modern product design is in eyeglass (spectacle) frames, which can be accidentally bent out of shape but will spring back to their original, correctly fitting shape, giving the product much greater durability against everyday accidental damage than a conventional metal frame.
Final answer: (a) graphene is a form of carbon that is extremely thin (a single layer of atoms), yet very strong, highly flexible, and an excellent conductor of electricity; this combination allows it to be used as a transparent, flexible, electrically conductive layer within a display, meaning the display itself can be bent or flexed without breaking or losing electrical function; (b) e.g. shape memory alloys, which can be used in eyeglass frames (spectacle frames) that automatically return to their original shape after being bent or deformed

(a) [1] identifies graphene as thin/strong; [1] identifies graphene as an excellent electrical conductor; [1] correctly links these combined properties to enabling a flexible, conductive display layer. [3]
(b) [1] valid named emerging/smart material (other than graphene); [1] valid, correctly described application in product design. [2]
Total [5].

Vacuum forming shapes a heated plastic sheet around a mould using air pressure, and proceeds through the following key stages:

1. Clamping: a flat sheet of thermoplastic (such as polystyrene) is securely clamped into a frame, positioned above a mould shaped like the finished product (here, a yoghurt pot), with small vacuum holes built into the mould's surface.

2. Heating: the clamped plastic sheet is heated, typically by an overhead heater, until it softens and becomes pliable enough to be stretched and shaped without tearing.

3. Forming position: the mould is raised up towards the softened sheet (or the frame holding the sheet is lowered onto the mould), bringing the pliable plastic into close contact with the mould's surface.

4. Vacuum forming: air beneath the sheet is extracted through the small holes in the mould, creating a vacuum. Normal atmospheric air pressure above the sheet then forces (sucks) the softened plastic down tightly over every contour of the mould, taking on its exact shape.

5. Cooling and finishing: the formed plastic is left to cool and harden while still held against the mould, fixing it in its new shape. Once sufficiently cool, it is removed from the mould and any excess material is trimmed away, leaving the finished yoghurt pot shape.
Final answer: 1. a sheet of thermoplastic (e.g. polystyrene) is clamped in a frame above a mould (the mould has the shape of the yoghurt pot, with small vacuum holes); 2. the plastic sheet is heated (e.g. by an overhead heater) until it softens and becomes pliable; 3. the mould is raised (or the frame lowered) so the softened sheet is brought close to/over the mould; 4. air is extracted (vacuum applied) through small holes in the mould, and atmospheric pressure forces/sucks the softened plastic sheet down tightly over the mould, taking on its shape; 5. the plastic is allowed to cool and harden against the mould, then removed and trimmed to the finished product shape

Level 1 (1 mark): basic, incomplete description with limited accurate detail (e.g. only 'plastic is heated and shaped').
Level 2 (2-3 marks): reasonable description covering most key stages (clamping, heating, forming) with some accurate detail, but missing the role of vacuum/air pressure or the cooling/trimming stage.
Level 3 (4 marks): full, accurate, correctly sequenced description covering clamping the sheet over the mould, heating until pliable, applying vacuum so atmospheric pressure forces the sheet onto the mould, and cooling/trimming to finish.

A good example product to illustrate this is a reusable stainless steel water bottle, designed to replace single-use plastic bottles.

Sustainability should be considered at every stage of the design process, not only added on at the end, because decisions made early on have the greatest influence on a product's overall environmental impact. During the research and specification stage, sustainability targets can be built directly into the design brief and specification from the outset — for example, specifying that the finished bottle must be made from recyclable materials, be genuinely durable and reusable (rather than disposable), and use minimal packaging. During material selection, choosing stainless steel over single-use plastic is itself a major sustainability decision: stainless steel is durable and fully recyclable, and because the bottle is designed to be reused many times, it displaces the need for large numbers of disposable plastic bottles over its lifetime, substantially reducing long-term plastic waste. During manufacture, sustainability considerations can shape how the bottle is actually produced, for example minimising material offcuts and energy use in the metal-forming processes used to shape the bottle body. Finally, at the product review and end-of-life stage, sustainability means designing the bottle so that, once it eventually reaches the end of its long working life, its stainless steel body can be easily separated and recycled rather than sent to landfill.

Considering sustainability at every one of these stages, rather than as an afterthought, is important for several reasons: it allows genuinely effective sustainability improvements (such as the fundamental choice of a durable, recyclable material) to be designed in from the very start, when they are easiest and cheapest to implement, rather than being bolted on to an already-fixed design later; it can reduce both environmental impact and manufacturing cost, since reducing material waste in manufacture also reduces material costs; and it increasingly reflects genuine consumer demand for more sustainable products, as well as growing legal and regulatory pressure on manufacturers to reduce environmental impact, meaning a product designed with sustainability in mind throughout is also more likely to remain commercially successful over time.
Final answer: example product: a reusable stainless steel water bottle; sustainability should be considered at every stage of the design process — during research/specification (setting sustainability targets, e.g. recyclable/reusable materials, minimal packaging), material selection (choosing durable, recyclable stainless steel over single-use plastic, reducing long-term waste), manufacture (minimising energy use and waste in production, e.g. reducing offcuts), and product review/end-of-life (designing for disassembly/recycling at the end of the product's life); considering sustainability throughout, rather than only at the end, allows genuine improvements (e.g. material choice, reduced packaging) to be designed in from the start, is more likely to reduce environmental impact and manufacturing cost through waste reduction, and increasingly reflects consumer demand and legal/regulatory pressure for more sustainable products

Level 1 (1-2 marks): basic knowledge of sustainability, limited/no linkage to a named product, lacks clarity/coherence, little specialist vocabulary.
Level 2 (3-5 marks): good knowledge covering sustainability at some stages of the design process, reasonably linked to a named product; good use of specialist vocabulary and coherence.
Level 3 (6-8 marks): comprehensive, accurate discussion of sustainability across MULTIPLE stages of the design process (e.g. specification, material selection, manufacture, end-of-life), clearly and specifically linked throughout to a named product, with a well-reasoned explanation of why considering sustainability throughout (not just at one stage) matters; excellent clarity, structure and specialist diction throughout.

Idea 1 — Folded plywood stand: This idea uses a single sheet of thin (approx. 4mm) plywood, laser-cut with a pattern of closely spaced slots (a 'living hinge') along fold lines, allowing the flat sheet to fold into a rigid triangular cross-section that props the laptop up at a comfortable viewing/typing angle. Material: plywood (laser-cut, living-hinge construction). Key dimension: when folded flat for storage, the stand measures approximately 300mm × 220mm × 10mm, slim enough to fit inside a laptop bag alongside the laptop itself.

Idea 2 — Telescopic aluminium leg stand: This idea uses a set of telescopic, folding aluminium tube legs, similar in mechanism to a small camera tripod, supporting a lightweight aluminium mesh platform on which the laptop rests (the mesh also allowing airflow for cooling). The legs fold inward against the platform for storage. Material: aluminium (tube legs and mesh platform). Key dimension: the platform measures approximately 300mm × 220mm, matching the footprint of a typical laptop.

Both ideas directly address the design brief's requirements for portability (fitting in a bag) and the ability to fold flat for storage, while using two contrasting construction approaches (a single folded sheet material versus a jointed frame structure) to give genuinely different initial design directions for further development.
Final answer: Idea 1: a single folded sheet of laser-cut plywood, hinged with a integral 'living hinge' cut pattern so it folds flat to approximately 300mm x 220mm x 10mm, and unfolds into a triangular cross-section stand that supports the laptop at an angle; Idea 2: a set of telescopic/folding aluminium tube legs (similar to a camera tripod), attached to a lightweight aluminium mesh platform roughly 300mm x 220mm, which fold inward to a compact bundle for storage in a bag

For EACH of the two ideas (maximum [2.5] each, totalling [5]): [1] genuinely distinct, plausible form/folding mechanism described; [1] a valid, correctly justified material named; [0.5] a plausible, specific key dimension given. Two clearly different ideas required for full credit; near-identical ideas capped at [3] overall.

Developing Idea 1, the folded plywood laptop stand, into a more detailed final design:

Method of construction/assembly: the entire stand is laser-cut from a single sheet of plywood in one piece, with the living-hinge fold-line pattern cut directly into the material. Near the base of the folded triangular shape, a set of small interlocking slots and tabs are cut into the design, allowing the user to fold the sheet into its rigid, triangular support shape and lock it in place by pushing the tabs into the slots, without needing any separate fixings, glue or tools — a genuinely tool-free assembly method that also makes the stand easy to flatten again for storage.

Ergonomic consideration: the design incorporates two alternative fold positions along the hinge pattern, giving the user a choice between a 15° laptop screen incline (better suited to comfortable typing, keeping the wrists in a more neutral position) or a steeper 25° incline (raising the screen higher, improving neck posture when the user is mainly viewing the screen rather than typing). Providing this adjustability directly addresses the different postural needs of typing versus viewing, rather than forcing a single fixed compromise angle.
Final answer: developing Idea 1 (folded plywood stand): the plywood sheet is laser-cut in one piece, including the living-hinge fold lines and a set of small interlocking slots near the base that lock the unfolded triangular shape rigid without needing separate fixings/glue (a tool-free, self-locking assembly); ergonomic consideration: the stand includes two possible fold positions, giving the laptop screen either a 15° or 25° incline, so the user can adjust the angle for either typing comfort or improved neck posture when only viewing the screen

[1] chosen idea from (a) clearly identified and developed (not a new idea); [2] plausible, specifically described method of construction/assembly (e.g. tool-free locking method, joint type); [2] a genuine, well-explained ergonomic consideration correctly incorporated into the developed design. Total [5].

SCAMPER is a structured checklist-based technique for generating design ideas. It works by deliberately applying each of a set of prompts — Substitute, Combine, Adapt, Modify, Put to another use, Eliminate, and Reverse — to an existing product or an initial idea, one at a time, prompting the designer to consider a wide range of new or modified possibilities that might not otherwise be considered, in a systematic rather than purely random way.
Final answer: SCAMPER is a structured idea-generation technique/checklist in which a designer deliberately applies a series of prompts (Substitute, Combine, Adapt, Modify, Put to another use, Eliminate, Reverse) to an existing product or idea, in order to systematically generate new or improved design possibilities

[1] correctly identifies SCAMPER as a structured/checklist idea-generation technique; [1] correctly names/describes at least two of its prompts or gives an equivalent full, accurate description.

Third angle orthographic projection is a standard, internationally recognised method of technical drawing used to communicate the exact 2D shape of a 3D object from several separate views (typically a front view, a plan/top view, and a side view). In third angle projection, each view is imagined as being projected onto a plane positioned behind the object relative to the viewer, and each resulting view is placed on the drawing sheet on the same side as the direction it was viewed from — for example, the view seen from directly above the object is drawn positioned above the front view.
Final answer: third angle orthographic projection is a standard method of technical drawing that shows an object from several separate 2D views (e.g. front, plan/top and side views), each drawn as if the observer is looking through the object at the projection plane behind it, with each view positioned on the drawing on the same side as the direction it was viewed from (e.g. the view from above is placed above the front view)

[1] correctly identifies it as a multi-view (e.g. front/plan/side) technical drawing method; [1] correctly describes the third-angle placement convention (view positioned on the same side as it was viewed from).

Batch production is a scale of production in which a specific, fixed quantity (a 'batch') of identical products is manufactured together, using the same setup and equipment. Once that batch is complete, the production equipment is changed over and reconfigured to manufacture a different batch, of either a different product or a modified version of the same product. This differs from continuous or mass production, where a single product is produced without interruption over a long period.
Final answer: batch production is a scale of production in which a set/batch of a fixed quantity of identical products is manufactured together, before the production line or equipment is changed over and reset to produce a different batch of a different product (or a modified version), rather than continuously producing one product without interruption

[1] correctly identifies a fixed quantity/batch of identical products made together; [1] correctly identifies that equipment is changed over/reset between batches of different products.

The Health and Safety at Work Act (HASAWA) places a general duty on employers to ensure, so far as is reasonably practicable, the health, safety and welfare of their employees while at work. In the context of a product design workshop, this includes requirements such as providing a safe working environment and properly maintained equipment/machinery, and providing employees (and students) with adequate information, instruction, training and supervision in the safe use of workshop tools and machinery, so that risks such as injury from machinery are minimised.
Final answer: the employer must, so far as is reasonably practicable, ensure the health, safety and welfare of employees at work, for example by providing a safe working environment, safe equipment/machinery, and adequate information, instruction, training and supervision for using workshop tools and machinery safely

[1] correctly identifies the general employer duty to ensure health/safety/welfare so far as reasonably practicable; [1] valid, specific workshop-relevant example (e.g. training, safe equipment, PPE).

Biophotovoltaics (BPV) is an emerging technology that generates electricity directly from the natural biological process of photosynthesis occurring in living plants, algae or certain bacteria. Electrons released as a by-product of photosynthesis are captured by an electrode and used to generate a small electric current, offering a fundamentally different, biologically-based approach to generating electricity compared with conventional solar cells, which rely on semiconductor materials rather than living organisms.
Final answer: biophotovoltaics is an emerging technology that generates a small electric current directly from the natural photosynthetic processes of living plants or algae, capturing electrons released during photosynthesis to produce electricity, rather than using conventional solar cells made from semiconductor materials

[1] correctly identifies electricity generation from photosynthesis/living plants or algae; [1] correctly distinguishes this from conventional semiconductor-based solar cells, or gives further accurate detail.

A registered design is a form of intellectual property protection that legally protects the visual appearance of a product — including features such as its shape, configuration, surface pattern or decoration — rather than how the product functions or works internally. Registering a design gives the owner the exclusive legal right to prevent others from making, using or selling a product with that same or a very similar visual appearance without permission. It is distinct from a patent, which instead protects a new invention's function or way of working.
Final answer: a registered design legally protects the visual/aesthetic appearance of a product — such as its shape, configuration, pattern or ornamentation — preventing others from copying or using that specific visual appearance without permission, though it does NOT protect how the product functions or works (which would instead require a patent)

[1] correctly identifies protection of visual/aesthetic appearance (shape/pattern/ornamentation); [1] correctly distinguishes this from protecting function (patents), or gives further accurate detail.

Since D requires both B and C to be complete before it can start, there are two possible paths through the network, both starting at A and ending at D:

Path 1: A → B → D = 2 + 3 + 4 = 9 days.
Path 2: A → C → D = 2 + 5 + 4 = 11 days.

The critical path is the LONGEST path through the network, since this determines the minimum time the whole project can possibly take (D cannot start until both B and C are finished, so the project cannot finish sooner than the longer of the two paths feeding into D). Path 2 (A-C-D, 11 days) is longer than Path 1 (A-B-D, 9 days), so the critical path is A-C-D, and the minimum overall project duration is 11 days.
Final answer: Path A-B-D = 9 days; Path A-C-D = 11 days; critical path = A-C-D; minimum overall project duration = 11 days

M1 correct duration for path A-B-D (9 days); M1 correct duration for path A-C-D (11 days); A1 correctly identifies A-C-D as the critical (longest) path; A1 correctly identifies 11 days as the minimum project duration; B1 correct understanding shown that the critical path is the longest path through the network (can be implied by correct working). Total [5].

(a) Material required per unit = 40g = 0.040 kg. Cost per unit of material = 0.040 kg × £2.20/kg = £0.088.
Total material cost for the batch = £0.088 × 250 = £22.00.

(b) Total cost for the batch = material cost + setup cost = £22.00 + £180 = £202.00.
Cost per unit = £202.00 ÷ 250 = £0.808, which rounds to £0.81 (to the nearest penny).
Final answer: (a) £22.00; (b) £0.81 per unit

(a) M1 correct method (mass per unit × cost per kg × 250, or equivalent); A1 £22.00. [2]
(b) M1 correct method (material cost + setup cost, divided by 250) — follow through from candidate's own (a); A1 £0.81 (accept £0.808 unrounded, or correct follow-through value from an incorrect (a) correctly divided and rounded). [2]
Total [4].

(a) A scale of 1:5 means every 1 unit on the drawing represents 5 units in real life, so the real length is found by multiplying the drawing measurement by the scale factor:
Actual length = drawing length × scale factor = 84 mm × 5 = 420 mm.

(b) To convert from mm to cm, divide by 10 (since 1 cm = 10 mm):
420 mm ÷ 10 = 42 cm.
Final answer: (a) 420 mm; (b) 42 cm

(a) M1 correctly identifies scale factor of 5 must be applied by multiplication; M1 correct substitution (84 × 5); A1 420 mm. [3]
(b) M1 correct method (÷10, follow through from candidate's own (a)); A1 42 cm. [2]
Total [5].

Number of blanks that fit along the 2400mm length = 2400 ÷ 300 = 8.
Number of blanks that fit along the 1200mm width = 1200 ÷ 200 = 6.
Total number of whole blanks = 8 × 6 = 48.
Check using areas: sheet area = 2400 × 1200 = 2,880,000 mm²; blank area = 300 × 200 = 60,000 mm²; 2,880,000 ÷ 60,000 = 48, confirming the sheet divides exactly into 48 blanks with no waste, consistent with the direct calculation above.
Final answer: 48 blanks

M1 correctly calculates blanks along the length (2400÷300 = 8); M1 correctly calculates blanks along the width (1200÷200 = 6); A1 correctly multiplies to find total (8×6); A1 48 blanks. Total [4].

Overall form/construction: the bracket consists of a flat aluminium backplate that is screw-fixed to the shop wall, with a rigid aluminium display arm projecting outward and upward from the backplate to hold the tablet at the required viewing angle.

Holding the 8mm tablet thickness: at the end of the display arm, a shallow U-shaped channel is formed, with an internal gap slightly larger than 8mm (to comfortably accommodate the tablet's thickness plus any protective case), lined with a thin strip of soft silicone rubber, which grips the tablet securely along its edge without scratching or marking the tablet's casing.

Achieving and fixing the 60° angle: the angle between the backplate and the display arm is formed permanently during manufacture (for example, welded or bent into a rigid aluminium bar or extrusion at exactly 60°), rather than through an adjustable hinge. This ensures the angle is fixed and cannot accidentally be knocked out of position during everyday use in a busy retail shop, which is important since the bracket is intended to present the tablet consistently rather than being user-adjustable.

Tool-free attachment/removal mechanism: the open end of the U-shaped channel incorporates a spring-loaded, silicone-tipped clip. Staff simply press this clip to open the channel wide enough to insert or remove the tablet by hand; releasing the clip allows the spring to close it again securely around the tablet's edge, holding it firmly in place. This achieves genuinely tool-free attachment and removal, requiring no screwdriver or other tool.

Material selection for the working load: the backplate and display arm are made from aluminium (for example, a 4mm thick aluminium bar or sheet section), chosen because aluminium offers a strong combination of rigidity and light weight; at this thickness, an aluminium arm of this design is comfortably capable of supporting the specified 1.5kg working load (the tablet's weight plus a safety margin) without excessive bending or risk of failure, while also keeping the overall bracket lightweight and unobtrusive for the retail display setting.
Final answer: a bracket comprising a flat wall-mounted aluminium backplate (fixed to the wall with screws through pre-drilled holes), with a rigid, welded/formed aluminium arm projecting from the backplate at a fixed 60° angle from the wall (angle formed permanently during manufacture, so it cannot be adjusted or knocked out of position); at the end of the arm, a shallow U-shaped channel, 10mm deep (with an 8mm gap plus clearance), lined with a thin strip of soft silicone rubber to grip the tablet's edge without scratching it and to accommodate the 8mm tablet thickness; the tablet is held in the channel by a sprung, spring-loaded silicone-tipped clip at the open end of the channel that the user presses to open (releasing the tablet) and which snaps closed again around the tablet edge when released, giving genuinely tool-free attachment/removal; the aluminium backplate and arm are sized (e.g. 4mm thick aluminium bar/sheet) to comfortably support the 1.5kg working load, since aluminium has a good strength-to-weight ratio and is not overstressed at this load

Level 1 (1-3 marks): basic design idea presented, addressing at most one of the four requirements, with limited annotation/technical detail.
Level 2 (4-7 marks): a coherent design solution addressing most of the four requirements (e.g. holding the tablet, the fixed angle, tool-free attachment, load-bearing material) with reasonable annotation and material justification, but one requirement underdeveloped or missing.
Level 3 (8-10 marks): a fully coherent, well-annotated design solution correctly and specifically addressing ALL FOUR requirements — securely holding an 8mm tablet, achieving and permanently fixing the 60° angle, a genuinely tool-free attachment/removal mechanism, and a named material sized/justified to support the 1.5kg load — with clear, specific technical detail throughout.