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VCE Product Design And Technologies study materials
VCE Product Design And Technologies study resources

VCE Product Design And Technologies practice questions

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Question 1Design and product development processes (design briefs, research, ideation, evaluation)

Which statement best describes the purpose of a design brief?

  1. It records the designer's final aesthetic decisions for manufacture.
  2. It sets out the problem, constraints and intended user needs to guide development. Correct answer.
  3. It documents workplace safety procedures for factory staff.
  4. It lists the retail price and profit margin for the finished product.

Explanation

A design brief defines the problem to be solved, who the product is for, and the limits within which the designer must work. It is a starting reference that later decisions can be judged against, rather than a record of finished choices or commercial pricing.

Question 2Design and product development processes (design briefs, research, ideation, evaluation)

A designer writes a constraint in a brief as 'the product must withstand outdoor weather for at least three years'. What type of constraint is this?

  1. A personal opinion
  2. A performance requirement Correct answer.
  3. A marketing objective
  4. An aesthetic preference

Explanation

Constraints that specify measurable behaviour the product must achieve, such as durability over a set period, are performance requirements. They can be tested against evidence, unlike tastes or promotional goals.

Question 3Design and product development processes (design briefs, research, ideation, evaluation)

During research, a student interviews five people who already own the product being redesigned. Which research category does this represent?

  1. Primary research using direct user contact Correct answer.
  2. Secondary research using published statistics
  3. Historical research using archived patents
  4. Tertiary research using library catalogues

Explanation

Talking directly to people gathers new data generated for this specific project, which makes it primary research. Published statistics, catalogues and archives are sources produced by others for other purposes.

Question 4Design and product development processes (design briefs, research, ideation, evaluation)

What is the main purpose of generating several divergent ideas before selecting one?

  1. To widen the range of possible solutions that can be compared Correct answer.
  2. To reduce the amount of sketching the designer must do
  3. To delay the project so deadlines become more realistic
  4. To prove that the first idea was already the best

Explanation

Divergent ideation deliberately produces a broad set of options so that weak approaches can be identified and stronger concepts combined. Judging ideas too early narrows thinking and often locks in a mediocre first solution.

Question 5Design and product development processes (design briefs, research, ideation, evaluation)

Which tool is most suitable for comparing a shortlist of concepts against weighted criteria?

  1. A mood board
  2. A cutting list
  3. A decision matrix Correct answer.
  4. A Gantt chart

Explanation

A decision matrix scores each concept against criteria and can weight those criteria by importance, making comparisons transparent. Gantt charts schedule tasks, mood boards communicate style, and cutting lists support manufacture.

Question 6Design and product development processes (design briefs, research, ideation, evaluation)

A brief states that a school bag must carry a laptop, cost under a set amount, and be made from recycled fabric. Which element is a constraint rather than a criterion for success?

  1. The bag is comfortable for daily use
  2. The bag appeals to teenage buyers
  3. The bag costs less than the stated amount Correct answer.
  4. The bag is easy to repair

Explanation

A fixed spending limit is a boundary the design must stay within, so it is a constraint. The other statements describe qualities the finished product should achieve and are therefore evaluation criteria.

Question 7Design and product development processes (design briefs, research, ideation, evaluation)

A designer builds a rough physical model early to check how a handle feels in the hand. What is this model mainly used for?

  1. Testing ergonomic interaction before detailed design Correct answer.
  2. Confirming the final surface finish for production
  3. Calculating the retail price of the product
  4. Documenting the manufacturing sequence

Explanation

Rough early models test how a user physically interacts with a concept, allowing ergonomic problems to be found cheaply. They are not finished artefacts, so surface finish and production planning come later.

Question 8Design and product development processes (design briefs, research, ideation, evaluation)

Why should a design brief identify the intended end user rather than a general market?

  1. It guarantees the product will be commercially successful.
  2. It focuses requirements on the needs and capabilities of specific people. Correct answer.
  3. It allows the designer to charge a higher price.
  4. It removes the need to do any further research.

Explanation

Naming the end user lets the designer translate that person's needs, abilities and context into specific requirements. A vague market description gives no basis for deciding which features matter.

Question 9Design and product development processes (design briefs, research, ideation, evaluation)

A designer records that the current product's lid cracks when dropped. Which research finding is this?

  1. An aesthetic judgement
  2. A user preference
  3. A functional weakness Correct answer.
  4. A cost estimate

Explanation

A part failing under a specific load is evidence of a functional weakness in the existing product. Recording it gives the redesign a concrete problem to solve, which is different from taste or price data.

Question 10Design and product development processes (design briefs, research, ideation, evaluation)

Which action best demonstrates that a designer used research evidence rather than assumption?

  1. Choosing a colour because it is the designer's favourite
  2. Adding features because a friend suggested them
  3. Selecting a grip size based on measured hand data from users Correct answer.
  4. Copying a competitor's product without analysis

Explanation

Basing a design decision on measured data from the intended users shows that research informed the choice. Personal taste, unexamined copying and single informal suggestions are not evidence-based.

Question 11Design and product development processes (design briefs, research, ideation, evaluation)

In a design brief, what is the difference between a constraint and a criterion for success?

  1. A constraint is optional, while a criterion is compulsory.
  2. A constraint is a limit that must be met, while a criterion is a quality used to judge the outcome. Correct answer.
  3. A constraint is set by users, while a criterion is set by retailers.
  4. A constraint applies to materials, while a criterion applies to colour.

Explanation

Constraints define the boundaries the solution must operate within, such as budget or size. Criteria are the qualities the finished design is evaluated against, such as durability or ease of use, and they guide judgement rather than setting hard limits.

Question 12Design and product development processes (design briefs, research, ideation, evaluation)

A design team uses brainstorming but a senior member dominates and junior members stay silent. Which change would most improve the ideation outcome?

  1. Use a silent written idea-generation phase before group discussion Correct answer.
  2. Ask the senior member to decide the final concept alone
  3. Shorten the session so fewer ideas are raised
  4. Invite fewer participants to the session

Explanation

Silent individual generation lets quieter participants contribute ideas before group dynamics take over, which increases the range of concepts. Reducing participants or time, or handing the decision to one person, narrows input further.

Question 13Design and product development processes (design briefs, research, ideation, evaluation)

A student sketches twenty quick thumbnails of a bottle shape. What is the main benefit of this approach?

  1. It replaces the need for any user research
  2. It produces a fully resolved manufacturing drawing
  3. It proves the design meets all safety standards
  4. It explores many form variations cheaply and quickly Correct answer.

Explanation

Rapid thumbnails are low-cost ways to explore a wide range of forms before committing to detailed development. They are exploratory sketches, so they do not resolve manufacturing detail or verify compliance.

Question 14Design and product development processes (design briefs, research, ideation, evaluation)

A designer wants feedback on a concept's usability before investing in tooling. Which evaluation method gives the most relevant evidence?

  1. Reviewing the concept's colour palette against a trend report
  2. Asking users to trial a working prototype and report difficulties Correct answer.
  3. Calculating the material cost of the final product
  4. Reading the manufacturer's warranty terms

Explanation

Usability is judged by observing or questioning real users interacting with a prototype, which reveals practical difficulties early. Trend reviews, costing and warranty documents do not test whether people can use the product.

Question 15Design and product development processes (design briefs, research, ideation, evaluation)

Which source would best provide secondary data on global sales trends for a product category?

  1. A single customer email
  2. A published industry market report Correct answer.
  3. A focus group run by the designer
  4. The designer's own workshop notes

Explanation

Secondary data is information already gathered and published by others, such as an industry market report. Focus groups, individual emails and personal notes are primary material generated for this project.

Question 16Design and product development processes (design briefs, research, ideation, evaluation)

A brief requires a product that is 'affordable for students'. Which revision makes this requirement more usable for evaluation?

  1. The product should retail below a stated price that students typically pay Correct answer.
  2. The product should feel inexpensive to buyers
  3. The product should look cheaper than competitors' products
  4. The product should use the least expensive material available

Explanation

Turning a vague phrase into a measurable target, such as a specific price ceiling, lets the designer test whether the outcome meets the brief. The other options remain subjective or focus on appearance and materials rather than the user's ability to pay.

Question 17Design and product development processes (design briefs, research, ideation, evaluation)

A designer reviews a concept and finds it meets the cost constraint but fails two success criteria. What is the most appropriate response?

  1. Ignore the criteria because cost matters more
  2. Modify or replace the concept so it satisfies the criteria Correct answer.
  3. Proceed to manufacture because the cost constraint is met
  4. Abandon the brief and rewrite the criteria to match the concept

Explanation

Success criteria exist to judge whether a concept is acceptable, so a concept that fails them should be revised or replaced. Rewriting the criteria to fit a weak concept defeats the purpose of evaluation.

Question 18Design and product development processes (design briefs, research, ideation, evaluation)

Why is it useful to record rejected ideas alongside their reasons during development?

  1. It increases the number of pages in the folio
  2. It guarantees the final product will be original
  3. It documents the reasoning that shaped later decisions and supports reflection Correct answer.
  4. It removes the need to evaluate the final outcome

Explanation

Recording rejected ideas with reasons preserves the decision trail, showing why later choices were made and supporting reflective evaluation. It does not by itself guarantee originality or replace final testing.

Question 19Design and product development processes (design briefs, research, ideation, evaluation)

A designer sets a criterion 'the product must be repairable by the user'. Which evidence would best demonstrate this criterion has been met?

  1. A trial where a typical user replaces a worn part using standard tools Correct answer.
  2. A statement in the marketing brochure claiming easy repair
  3. A sketch showing the product's outer shape
  4. A list of the materials used in the casing

Explanation

Criteria are verified by evidence of the required performance, and a user trial with standard tools directly tests repairability. Marketing claims, shape sketches and material lists do not show whether repair is actually achievable.

Question 20Design and product development processes (design briefs, research, ideation, evaluation)

A brief asks for a lamp that is 'safe for children'. Which combination of research and requirement best addresses this?

  1. Reducing the retail price to suit family budgets
  2. Using the lightest possible material for the base
  3. Specifying low surface temperature and no small detachable parts, based on child-safety guidance Correct answer.
  4. Choosing bright colours and a playful shape

Explanation

Child safety is addressed by identifying specific hazards, such as burns and choking, from recognised guidance and turning them into measurable requirements. Colour, price and weight do not directly control those hazards.

Question 21Design and product development processes (design briefs, research, ideation, evaluation)

A designer's brief specifies a target user group, but testing shows the product is difficult for a subgroup within that group. What is the most rigorous next step?

  1. Narrow the stated target group so the difficulty no longer applies
  2. Remove the usability criterion from the brief
  3. Investigate the subgroup's needs and revise the design or the brief accordingly Correct answer.
  4. Proceed because the majority of the group managed the product

Explanation

When evidence shows part of the intended user group is excluded, rigorous practice is to understand why and adjust either the design or the brief's scope transparently. Redefining the group or deleting the criterion merely hides the problem.

Question 22Design and product development processes (design briefs, research, ideation, evaluation)

Two concepts score equally in a decision matrix. Which action would most improve the reliability of the final choice?

  1. Choose the concept that is cheaper to draw
  2. Select the concept the designer personally prefers
  3. Re-examine the weighting of criteria and gather additional evidence for uncertain scores Correct answer.
  4. Add more criteria until one concept scores higher

Explanation

A tie often signals uncertain scores or questionable weightings, so reviewing both and collecting better evidence improves the decision. Personal preference, manipulating criteria to force a result, or choosing by drafting effort do not strengthen the evaluation.

Question 23Design and product development processes (design briefs, research, ideation, evaluation)

A designer claims a concept is sustainable because it uses recycled material. Which analysis best tests this claim against the brief?

  1. Compare the concept's colour with other recycled products
  2. Assess the whole life cycle, including manufacture, transport, use and disposal, against the brief's sustainability criteria Correct answer.
  3. Confirm the material is recycled and conclude the product is sustainable
  4. Check whether the material is available in the designer's local shop

Explanation

Sustainability claims require a life-cycle view, because impacts occur across manufacture, distribution, use and end-of-life, not only in material choice. A single attribute such as recycled content is insufficient evidence.

Question 24Design and product development processes (design briefs, research, ideation, evaluation)

A team must choose between a concept that fully meets the brief but is complex to manufacture and a simpler concept that meets most criteria. Which reasoning is most defensible?

  1. Defer the decision until both concepts are fully manufactured
  2. Always choose the simpler concept because complexity is undesirable
  3. Weigh manufacturing feasibility against the importance of the unmet criteria before deciding Correct answer.
  4. Always choose the fully compliant concept regardless of manufacturing difficulty

Explanation

Sound evaluation weighs how critical the unmet criteria are against the practical risks of manufacture, rather than applying a fixed rule. The decision should be justified with evidence about both compliance and feasibility.

Question 25Design and product development processes (design briefs, research, ideation, evaluation)

A designer realises midway that the original brief omitted a key user need discovered in testing. What is the most appropriate professional response?

  1. Add the need to the final product without recording the change
  2. Abandon all previous work and start again from nothing
  3. Continue silently and hope the omission is not noticed
  4. Document the new finding, consult the client or brief owner, and formally revise the brief Correct answer.

Explanation

Design briefs are working documents that can be revised when evidence reveals a genuine gap, provided the change is recorded and agreed with those who set the brief. Silent continuation or undocumented changes remove the decision trail.

Question 26Design and product development processes (design briefs, research, ideation, evaluation)

Which statement best defines a design brief?

  1. A document that outlines the problem, target user, constraints, and criteria for success. Correct answer.
  2. A portfolio of initial sketches and concept drawings.
  3. A detailed manufacturing plan that specifies every production step.
  4. A legal contract between the designer and the client.

Explanation

A design brief is a foundational document that defines the design problem, identifies the intended user, and sets out the constraints and criteria that will guide and evaluate the design work. It is not a manufacturing plan, a sketch portfolio, or a legal contract, although it may inform those later documents.

Question 27Design and product development processes (design briefs, research, ideation, evaluation)

During research, a designer measures the hand span of 50 potential users. What type of data is this?

  1. Primary quantitative data. Correct answer.
  2. Primary qualitative data.
  3. Secondary qualitative data.
  4. Secondary quantitative data.

Explanation

Primary data is collected firsthand by the designer for the specific project, and quantitative data is numerical and measurable. Measuring hand spans directly from users therefore produces primary quantitative data, which can inform sizing decisions.

Question 28Design and product development processes (design briefs, research, ideation, evaluation)

A designer needs to generate a wide range of creative solutions quickly. Which technique is most appropriate?

  1. Morphological analysis.
  2. Brainstorming. Correct answer.
  3. Decision matrix scoring.
  4. Finite element analysis.

Explanation

Brainstorming is an ideation technique designed to produce many diverse ideas rapidly by encouraging free thinking and deferring judgement. Decision matrices and finite element analysis are evaluation tools, while morphological analysis is a structured method for combining options rather than a quick divergent technique.

Question 29Design and product development processes (design briefs, research, ideation, evaluation)

What is the main purpose of creating a prototype during product development?

  1. To serve as the final product for sale.
  2. To test and communicate design ideas in a tangible form. Correct answer.
  3. To replace the need for any user feedback.
  4. To reduce the initial cost of materials.

Explanation

A prototype is a physical or digital model built to test aspects of a design, communicate ideas to others, and gather feedback before committing to production. It is not intended as the final sale item and does not eliminate the need for user testing.

Question 30Design and product development processes (design briefs, research, ideation, evaluation)

A design brief states that a new backpack must be 'lightweight'. Which revision makes this requirement more measurable for evaluation?

  1. The backpack must weigh no more than 1.2 kg when empty. Correct answer.
  2. The backpack should use lightweight materials.
  3. The backpack must be lighter than competitors' bags.
  4. The backpack should feel light when worn.

Explanation

A measurable requirement includes a specific value and unit so that the final product can be objectively tested against it. Stating a maximum empty weight in kilograms allows direct measurement, whereas qualitative phrases like 'feel light' or comparative statements without a benchmark cannot be reliably evaluated.

Question 31Design and product development processes (design briefs, research, ideation, evaluation)

A designer is evaluating three concepts against weighted criteria. Which step would most improve the objectivity of the decision?

  1. Using a consistent scoring scale and defining what each score means. Correct answer.
  2. Allowing the most senior designer to assign all scores.
  3. Ignoring criteria that are difficult to measure.
  4. Choosing the concept that looks most appealing.

Explanation

Objectivity in a decision matrix improves when all evaluators use the same scale and have clear descriptors for each score level, reducing personal bias. Relying on one person, aesthetic preference, or discarding difficult criteria undermines the systematic comparison.

Question 32Design and product development processes (design briefs, research, ideation, evaluation)

A designer wants to understand how users currently perform a task in their own environment. Which research method is most suitable?

  1. Analysing competitor patents.
  2. Observing users in context and interviewing them. Correct answer.
  3. Sending out a large-scale online survey.
  4. Reviewing published sales figures.

Explanation

Observational research in the user's own environment, combined with interviews, provides rich contextual understanding of real behaviours and pain points. Surveys, sales figures, and patents offer useful but less direct insight into actual task performance.

Question 33Design and product development processes (design briefs, research, ideation, evaluation)

During ideation, a team uses a method where each member writes an idea, passes it on, and builds on the previous idea. What is this technique called?

  1. Brainwriting. Correct answer.
  2. Force-field analysis.
  3. Delphi method.
  4. Nominal group technique.

Explanation

Brainwriting is a silent, written ideation technique in which participants pass ideas around and build on them, reducing dominance by individual voices. The nominal group technique and Delphi method are structured decision or consensus methods, and force-field analysis examines driving and restraining forces.

Question 34Design and product development processes (design briefs, research, ideation, evaluation)

A designer has completed a concept and wants to identify potential failures before production. Which evaluation approach is most appropriate?

  1. A failure mode and effects analysis (FMEA). Correct answer.
  2. A customer satisfaction survey after launch.
  3. A review of the marketing plan.
  4. A focus group on brand perception.

Explanation

Failure mode and effects analysis is a systematic method for identifying possible failure modes, their causes, and their effects, allowing risks to be addressed before production. Post-launch surveys, brand focus groups, and marketing reviews do not systematically identify technical failure risks.

Question 35Design and product development processes (design briefs, research, ideation, evaluation)

A designer finds that a proposed material is recyclable but requires an energy-intensive process. Which conclusion best reflects a life-cycle perspective?

  1. The material is sustainable because it is recyclable.
  2. Sustainability depends only on the material's end-of-life option.
  3. The material's overall impact must be assessed across extraction, processing, use, and disposal. Correct answer.
  4. Energy use during processing is irrelevant if the material is recyclable.

Explanation

A life-cycle perspective evaluates environmental impacts at every stage, from raw material extraction through processing, use, and end-of-life. Focusing only on recyclability ignores significant impacts such as the energy consumed during processing.

Question 36Design and product development processes (design briefs, research, ideation, evaluation)

A designer creates a low-fidelity cardboard model of a chair to check its basic proportions. What is the main limitation of this model?

  1. It cannot reliably test structural strength or durability. Correct answer.
  2. It cannot communicate the overall form.
  3. It cannot be shown to potential users.
  4. It is too expensive to produce at this stage.

Explanation

Low-fidelity models such as cardboard mock-ups are useful for exploring form, proportion, and basic ergonomics, but their materials do not replicate the strength, durability, or behaviour of production materials. They can still communicate form and be shown to users.

Question 37Design and product development processes (design briefs, research, ideation, evaluation)

A designer is writing a brief for a new kitchen utensil. Which pair best distinguishes a constraint from a criterion for success?

  1. Constraint: must be dishwasher safe; criterion: should be aesthetically pleasing.
  2. Constraint: must cost under $15 to manufacture; criterion: must withstand 500 dishwasher cycles. Correct answer.
  3. Constraint: must be available in three colours; criterion: must retail under $20.
  4. Constraint: should be ergonomic; criterion: must be made of metal.

Explanation

A constraint is a fixed limitation that the design must satisfy, such as a manufacturing cost ceiling, while a criterion for success is a measurable standard used to judge how well the design performs, such as passing a durability test. The other pairs either mislabel fixed limits as criteria or use vague, non-measurable statements.

Question 38Design and product development processes (design briefs, research, ideation, evaluation)

A designer needs to estimate the manufacturing cost of a new product before building a business case. Which approach is most appropriate?

  1. Preparing a detailed cost breakdown using material, labour, and overhead estimates. Correct answer.
  2. Guessing based on similar products without any data.
  3. Asking friends whether the product seems affordable.
  4. Waiting until after production to calculate actual costs.

Explanation

A cost estimate for a business case should be built from itemised estimates of materials, labour, tooling, and overhead, often informed by supplier quotes. Guessing, delaying calculation, or relying on informal opinions does not provide the reliable figures needed for decision-making.

Question 39Design and product development processes (design briefs, research, ideation, evaluation)

A designer is comparing two concepts. Concept A meets all criteria but requires a new production process; Concept B meets most criteria using existing processes. Which analysis best supports the decision?

  1. Choosing Concept B because it is simpler to manufacture.
  2. Deferring the decision until a competitor launches a similar product.
  3. Choosing Concept A because it meets all criteria.
  4. Weighing the cost and risk of the new process against the performance benefits of Concept A. Correct answer.

Explanation

A sound decision weighs the performance advantages of Concept A against the added cost, time, and risk of implementing a new production process. Simply choosing on criteria alone or on simplicity alone ignores the trade-off, and deferring to competitors is not a design decision.

Question 40Design and product development processes (design briefs, research, ideation, evaluation)

Midway through development, testing reveals a user need that was not included in the original brief. What is the most appropriate response?

  1. Abandon the project entirely and start again.
  2. Ignore the finding to avoid delaying the project.
  3. Continue with the original brief and note the issue for a future product.
  4. Revise the brief to incorporate the need and reassess the design against updated criteria. Correct answer.

Explanation

Design briefs are working documents that should be updated when significant new information emerges, provided the change is managed and the implications are assessed. Ignoring the finding risks producing a product that fails users, while abandoning the project is an overreaction.

Question 41Materials, components and their properties and characteristics

Which property describes a material's ability to be hammered or rolled into thin sheets without cracking?

  1. Elasticity
  2. Malleability Correct answer.
  3. Hardness
  4. Ductility

Explanation

Malleability is the capacity of a material to deform permanently under compressive force, allowing it to be shaped into thin sheets, as seen when aluminium is rolled into foil. Ductility instead concerns drawing into wire, elasticity concerns recovery of shape, and hardness concerns resistance to indentation.

Question 42Materials, components and their properties and characteristics

A designer needs a transparent, rigid material for a protective display window on a low-cost product. Which material is most suitable?

  1. Low-density polyethylene
  2. Mild steel
  3. Silicone rubber
  4. Polymethyl methacrylate (acrylic) Correct answer.

Explanation

Acrylic is a thermoplastic that is optically clear and rigid, so it transmits light while holding shape, making it suitable for display windows. Polyethylene is translucent at best and flexible, steel is opaque, and silicone is transparent but far too flexible to be rigid.

Question 43Materials, components and their properties and characteristics

Which material is a thermosetting polymer?

  1. Polyvinyl chloride
  2. Epoxy resin Correct answer.
  3. Nylon
  4. Polypropylene

Explanation

Epoxy resin cures by a chemical cross-linking reaction that permanently sets its molecular network, so it cannot be remelted. Polypropylene, PVC and nylon are all thermoplastics whose chains are not cross-linked and can be softened repeatedly by heat.

Question 44Materials, components and their properties and characteristics

Which characteristic best explains why timber is described as an anisotropic material?

  1. It can be finished with a clear lacquer
  2. It is a renewable biological material
  3. It absorbs moisture from the surrounding air
  4. Its strength and shrinkage differ along and across the grain Correct answer.

Explanation

Anisotropy means properties vary with direction. In timber, fibres run longitudinally, so strength, stiffness and shrinkage are much greater along the grain than across it, which affects how parts are oriented in a design.

Question 45Materials, components and their properties and characteristics

Which property is most important when selecting material for a spring in a retractable pen mechanism?

  1. Malleability
  2. Thermal conductivity
  3. Elasticity Correct answer.
  4. Opacity

Explanation

A spring must deform under load and recover its original shape when the load is removed, which is the definition of elasticity. Malleability, thermal conductivity and opacity do not govern the repeated return of a spring to its rest length.

Question 46Materials, components and their properties and characteristics

Which of these is a composite material?

  1. Polystyrene
  2. Cartridge brass
  3. Stainless steel
  4. Glass-fibre reinforced polyester Correct answer.

Explanation

A composite combines two distinct materials, here glass fibres for strength and polyester resin as the matrix that binds and protects them, so the components remain identifiable. Steel, polystyrene and brass are each single materials, with brass being an alloy rather than a composite.

Question 47Materials, components and their properties and characteristics

Which material would be chosen for the body of a camping kettle because it conducts heat efficiently to the water?

  1. Aluminium Correct answer.
  2. Timber
  3. Expanded polystyrene
  4. Rubber

Explanation

Aluminium has high thermal conductivity, so heat from the flame passes quickly through the base into the water. Rubber, timber and expanded polystyrene are thermal insulators that would slow heat transfer and in some cases burn or melt.

Question 48Materials, components and their properties and characteristics

Which term describes the ability of a metal to resist being scratched or indented?

  1. Density
  2. Brittleness
  3. Toughness
  4. Hardness Correct answer.

Explanation

Hardness measures resistance to localised plastic deformation such as scratching or indentation. Toughness is resistance to crack propagation under impact, brittleness is fracture with little deformation, and density is mass per unit volume.

Question 49Materials, components and their properties and characteristics

A manufacturer wants a one-piece hollow bottle with no seam. Which process and material combination is most appropriate?

  1. Forging of carbon steel
  2. Blow moulding of PET Correct answer.
  3. Die casting of zinc alloy
  4. Sintering of ceramic powder

Explanation

Blow moulding inflates a softened thermoplastic parison against a mould cavity, producing a seamless hollow vessel, and PET is widely used because it is strong, clear and recyclable. Casting, forging and sintering are suited to solid or dense parts rather than thin seamless bottles.

Question 50Materials, components and their properties and characteristics

Why is a small amount of carbon added to iron when making steel?

  1. It increases strength and hardness by restricting slip within the crystal structure Correct answer.
  2. It makes the metal a better electrical insulator
  3. It prevents the metal from being recycled
  4. It lowers the melting point so the metal becomes transparent

Explanation

Carbon atoms occupy interstitial sites in the iron lattice and hinder the movement of dislocations, raising yield strength and hardness as carbon content rises. Carbon does not make metals transparent, insulating or unrecyclable.