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Pancyprian Design & Tech study materials
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Pancyprian Design & Tech practice questions

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Question 1Design process and problem solving

A design team begins by rewriting the client's brief as a set of user needs and measurable requirements before sketching. Which stage of the design process does this describe?

  1. Prototype testing
  2. Problem definition and specification Correct answer.
  3. Detailed embodiment design
  4. Design communication

Explanation

The design process starts with clarifying and specifying the problem: turning a vague brief into explicit needs, constraints and measurable criteria. Sketching only follows once the problem is defined. Embodiment and testing come later in the sequence.

Question 2Design process and problem solving

Which statement best describes the purpose of an iterative design loop rather than a strictly linear one?

  1. It ensures every stage is completed exactly once
  2. It removes the need for any documentation between stages
  3. It guarantees the first concept will be the final solution
  4. It allows earlier decisions to be revisited as new evidence from testing emerges Correct answer.

Explanation

Iteration means returning to earlier stages when evaluation shows a decision was weak, so the solution improves across cycles. A linear model assumes each stage is passed once and never revisited. Iteration adds feedback, not certainty or a reduced need for records.

Question 3Design process and problem solving

During specification, a designer separates 'must' criteria from 'want' criteria. What is the function of a 'must' criterion?

  1. A desirable feature that adds value if budget allows
  2. A criterion used only to rank concepts against each other
  3. A mandatory requirement the solution has to satisfy to be acceptable Correct answer.
  4. An optional target chosen by the marketing team

Explanation

Must criteria are non-negotiable constraints; any concept failing one is rejected regardless of other merits. Wants are desirable but optional features used to compare otherwise acceptable concepts. Keeping the two apart prevents weak solutions from being selected on attractive extras.

Question 4Design process and problem solving

A student writes a design brief that states only 'make a lamp that looks nice'. Which weakness is most significant for progressing the design process?

  1. It describes the concept before the problem
  2. It already fixes the manufacturing method
  3. It contains no measurable criteria or defined user context Correct answer.
  4. It specifies too many conflicting constraints

Explanation

A useful brief defines the user, the context of use and measurable criteria such as light output, cost or safety. 'Looks nice' cannot be tested or used to compare concepts. Without measurable criteria the team cannot evaluate whether a solution is acceptable.

Question 5Design process and problem solving

In a weighted decision matrix, concept A scores 4 on a criterion weighted 3, and concept B scores 5 on a criterion weighted 2. What are their weighted scores for these single entries?

  1. A scores 4 and B scores 5
  2. A scores 12 and B scores 10 Correct answer.
  3. A scores 12 and B scores 7
  4. A scores 7 and B scores 7

Explanation

A weighted score multiplies the raw score by the criterion weight: 4 × 3 = 12 for A and 5 × 2 = 10 for B. Adding instead of multiplying gives the wrong result. The weighted totals are then summed across all criteria to rank concepts.

Question 6Design process and problem solving

Which activity is characteristic of divergent thinking in the early concept phase?

  1. Generating a wide range of distinct ideas before judging any of them Correct answer.
  2. Writing the final manufacturing specification
  3. Testing one prototype to destruction
  4. Selecting the single best idea as soon as it appears

Explanation

Divergent thinking widens the solution space by producing many varied ideas without premature evaluation. Convergent thinking then narrows the field by judging and selecting. Separating the two phases prevents early ideas from crowding out better options.

Question 7Design process and problem solving

A team uses morphological analysis. They list key functions as rows and possible means for each function as columns. What does the method then require?

  1. Choosing the cheapest means in every row
  2. Combining one means from each function to form candidate overall solutions Correct answer.
  3. Testing each means physically before combining
  4. Ranking the functions by cost alone

Explanation

Morphological analysis systematically combines means across functions to reveal many possible configurations, including unconventional ones. Selection and testing come after combinations are generated. The aim is completeness of the solution space, not immediate cost choice.

Question 8Design process and problem solving

What is the main purpose of building a low-fidelity mock-up early in the process?

  1. To replace the need for any later prototype
  2. To prove the product will pass certification
  3. To test overall form and basic function cheaply before committing to detail Correct answer.
  4. To provide the final surface finish for the client

Explanation

Low-fidelity models test broad questions of form, scale and basic function at low cost and speed. They deliberately avoid fine detail so that changes remain cheap. High-fidelity and certification prototypes come later once the concept is stable.

Question 9Design process and problem solving

A designer plans to test a hand tool with users. Which approach gives the most useful formative feedback?

  1. Read the manufacturer's catalogue description
  2. Observe representative users performing realistic tasks and record difficulties Correct answer.
  3. Ask users whether they like the colour scheme only
  4. Measure the tool's mass to three decimal places

Explanation

Formative evaluation aims to find problems during development, so observing real users on realistic tasks reveals where the design fails. Aesthetic preference alone gives little functional insight. Measurement and catalogue reading are not user testing.

Question 10Design process and problem solving

Which pair correctly matches a design method with its main output?

  1. A Gantt chart produces the final product specification
  2. A mood board produces the tolerance drawing
  3. Brainstorming produces a broad list of candidate ideas Correct answer.
  4. A decision matrix produces the working prototype

Explanation

Brainstorming is an ideation method whose output is a quantity of varied candidate ideas for later screening. Scheduling tools, evaluation tools and visual research each have different outputs. Matching method to output is essential for planning the process.

Question 11Design process and problem solving

A designer records that a concept fails a must criterion on cost. According to good design-process practice, what should happen next?

  1. The concept is developed fully and the issue ignored
  2. The cost criterion is quietly removed from the specification
  3. The concept is rejected or modified before further development Correct answer.
  4. The must criterion is reclassified as a want to keep the concept

Explanation

Must criteria act as gates: failing one means the concept is either discarded or changed to meet it. Removing or downgrading the criterion undermines the specification and hides a real problem. The disciplined response protects the integrity of the evaluation.

Question 12Design process and problem solving

Which situation best illustrates a design constraint rather than a design criterion?

  1. The product ought to look modern
  2. The product would ideally be lightweight
  3. The product must operate from a single AA battery because of a client ruling Correct answer.
  4. The product should feel comfortable in the hand

Explanation

A constraint is a fixed boundary imposed on the solution, such as a mandated power source. Criteria are desirable qualities used to compare concepts and can be traded off. Constraints eliminate options; criteria rank them.

Question 13Design process and problem solving

Why is it good practice to define the target user and context of use before generating concepts?

  1. It guarantees the design will be commercially successful
  2. It focuses idea generation on real needs and gives criteria for later evaluation Correct answer.
  3. It removes the need to test the final product
  4. It allows the team to skip the specification stage

Explanation

Knowing who will use the product and where shapes which problems matter and provides the basis for evaluation criteria. It does not remove testing or guarantee commercial success. It is part of, not a replacement for, specification.

Question 14Design process and problem solving

In the double diamond model, what distinguishes the second diamond from the first?

  1. It removes the need for convergent thinking
  2. It repeats the problem exploration with a new client
  3. It replaces prototyping with market research
  4. It develops and delivers a defined solution rather than exploring the problem Correct answer.

Explanation

The first diamond diverges and converges on the problem, while the second diverges and converges on the solution. Both diamonds use divergent and convergent phases. The second diamond therefore develops, tests and delivers a chosen direction.

Question 15Design process and problem solving

A team keeps adding features to a torch until it becomes heavy, costly and hard to use. Which design principle is being violated?

  1. Consistency of branding
  2. Aesthetic use of colour
  3. Robustness of the housing
  4. Simplicity and fitness for purpose Correct answer.

Explanation

Good design keeps the solution focused on the real need; adding features that harm weight, cost and usability breaks simplicity and fitness for purpose. Robustness, colour and branding are separate concerns not described here. Feature creep is a common failure of undisciplined development.

Question 16Design process and problem solving

What is the role of a design review at the end of a development stage?

  1. To check the work against the specification and agree the next actions Correct answer.
  2. To finalise the marketing budget
  3. To generate the initial design brief
  4. To replace user testing with a manager's opinion

Explanation

A stage review checks progress against the agreed specification and decides whether to proceed, revise or stop. It complements rather than replaces user testing. The brief is produced at the start, not at a later review.

Question 17Design process and problem solving

A designer needs to compare three concepts against six criteria of differing importance. Which tool is most appropriate?

  1. A freehand rendering
  2. A tolerance schedule
  3. A weighted decision matrix Correct answer.
  4. A Gantt chart

Explanation

A weighted decision matrix is designed to score multiple concepts against multiple criteria while reflecting differing importance through weights. Gantt charts schedule time, renderings communicate appearance, and tolerance schedules specify dimensions. Only the matrix performs comparative evaluation.

Question 18Design process and problem solving

During evaluation, two concepts score almost identically. What is the most defensible next step?

  1. Investigate the uncertainty in the scores and test the key differences Correct answer.
  2. Average the two concepts into one immediately
  3. Discard both and start the project again
  4. Pick the concept with the more attractive sketch

Explanation

Near-equal scores usually signal uncertainty in the judgements or criteria, so the sound response is to gather evidence on the criteria that separate the concepts. Choosing on appearance is arbitrary. Merging or restarting prematurely wastes the analysis already done.

Question 19Design process and problem solving

Which statement about the relationship between form and function in the design process is most accurate?

  1. Form is always decided first and function is fitted to it
  2. Function is decided first and form never affects it
  3. Form and function are unrelated concerns handled by different people
  4. Form and function are developed together and each informs the other Correct answer.

Explanation

In practice form and function interact: functional needs constrain shape, and form decisions affect how well the product works and feels. Treating either as fixed first oversimplifies the process. Good design resolves both together through iteration.

Question 20Design process and problem solving

A designer uses a checklist of questions such as 'what if it were larger?' and 'what if it were reversed?' to spark ideas. Which technique is this?

  1. Critical path scheduling
  2. Tolerance analysis
  3. SCAMPER-style prompting Correct answer.
  4. Fault tree analysis

Explanation

SCAMPER prompts use substitute, combine, adapt, modify, put to other use, eliminate and reverse questions to trigger new ideas. Fault tree analysis investigates failure causes, critical path scheduling plans time, and tolerance analysis controls dimensions. Only the prompting method is for ideation.

Question 21Design process and problem solving

What is the main reason for documenting decisions and their justification throughout the design process?

  1. It guarantees the design will not fail
  2. It removes the need to evaluate concepts
  3. It allows later stages to understand why choices were made and to revisit them rationally Correct answer.
  4. It is only needed to satisfy an examiner at the end

Explanation

A record of decisions and reasoning lets later team members understand constraints and change course with evidence rather than guesswork. Documentation supports but does not replace evaluation. It cannot guarantee success, only improve traceability.

Question 22Design process and problem solving

A team proposes to skip prototyping and go straight from concept sketches to production tooling. What is the most significant risk?

  1. Undetected functional or manufacturing problems become expensive to correct Correct answer.
  2. The team will spend too long on evaluation
  3. The criteria will become too measurable
  4. The sketches will be too detailed

Explanation

Prototypes expose problems in function, assembly and manufacture while changes are still cheap. Committing to tooling without that evidence makes later corrections very costly. The other options describe unlikely or harmless outcomes rather than the real risk.

Question 23Design process and problem solving

Which action best demonstrates convergent thinking after a broad ideation session?

  1. Generating twenty more variations of each idea
  2. Postponing any judgement until after manufacture
  3. Choosing ideas by random draw
  4. Screening the generated ideas against the must criteria to shortlist a few Correct answer.

Explanation

Convergent thinking narrows options by judging them against criteria, producing a shortlist for development. Generating more variations is still divergent. Postponing judgement indefinitely or drawing at random provides no reasoned selection.

Question 24Design process and problem solving

A school workshop asks students to design a storage unit for a cramped classroom. Which first step best reflects sound problem-solving practice?

  1. Choose the timber joint to be used
  2. Order the fixings in bulk
  3. Investigate how the space is used and measure the available dimensions Correct answer.
  4. Draw the finished unit in detail

Explanation

Sound practice starts by understanding the real problem: how the space is used and what the physical limits are. These findings feed the specification and criteria. Choosing joints, ordering materials or drawing detail commits to solutions before the problem is understood.

Question 25Design process and problem solving

A concept passes all must criteria but scores poorly on the weighted wants. What is the correct interpretation?

  1. The wants should be reweighted until it wins
  2. It must be rejected outright
  3. It is acceptable but less attractive than higher-scoring concepts Correct answer.
  4. It should be put into production immediately

Explanation

Must criteria decide acceptability, while wants rank acceptable concepts by desirability. A concept that passes the gates but scores low on wants is viable yet not the preferred choice. Reweighting to force a winner would bias the evaluation.

Question 26Design process and problem solving

In the Pancyprian design process, a designer writes a short statement describing who the product is for, what need it meets and what success would look like. What is this document called?

  1. A production schedule
  2. A tolerance stack
  3. A design brief Correct answer.
  4. A bill of materials

Explanation

A design brief is the short written statement that fixes the problem, the user group and the intended outcomes before concept work begins. It guides later decisions and gives the team a shared reference for judging concepts. The other documents serve manufacturing, planning or dimensional purposes rather than problem definition.

Question 27Design process and problem solving

A design team is choosing which problem to solve before any sketching starts. Which activity belongs to this problem-definition stage?

  1. Selecting the final material for the housing
  2. Writing the assembly instructions for the manual
  3. Interviewing users to establish their real needs Correct answer.
  4. Cutting sheet metal for the first prototype

Explanation

Problem definition depends on understanding the people affected, so gathering user needs through interviews or observation comes first. Material choice, prototype fabrication and manual writing all follow once the problem and concept are settled. Mixing these later tasks into problem definition shortens the exploration that good design requires.

Question 28Design process and problem solving

A designer must record the requirements for a new classroom chair so that concepts can later be judged fairly. Which format best supports this?

  1. A list of must criteria and weighted want criteria Correct answer.
  2. A full-scale cardboard model of one idea
  3. A single paragraph describing the chair's style
  4. A mood board of chair photographs

Explanation

A specification expressed as must criteria plus weighted wants gives an explicit, comparable basis for evaluating concepts. Style prose and mood boards communicate intent but cannot be scored consistently. A model of one idea is already a concept and cannot serve as the yardstick for judging others.

Question 29Design process and problem solving

Which statement best describes the purpose of the Discover phase in the double diamond process?

  1. To test the finished product against sales targets
  2. To narrow options and commit to one concept
  3. To explore user needs and gather insight widely Correct answer.
  4. To build production tooling for the chosen design

Explanation

The first half of the first diamond is about opening up: observing users, gathering data and finding real needs before any narrowing. Narrowing and commitment belong to the Define phase, while tooling and sales testing come much later. Confusing discovery with decision-making is a common process error.

Question 30Design process and problem solving

A student team has produced forty rough concept sketches. Which action best moves the project forward at this point?

  1. Group the sketches by underlying principle and screen them against the must criteria Correct answer.
  2. Sketch forty more to increase variety
  3. Choose the most visually attractive sketch immediately
  4. Begin manufacturing the first sketch in the workshop

Explanation

After broad ideation the team must converge: clustering reveals shared principles and screening against must criteria removes unworkable ideas before detailed comparison. More sketching adds little once a wide range exists, and choosing on appearance alone ignores the specification. Manufacturing before evaluation wastes workshop time and material.

Question 31Design process and problem solving

A designer is preparing a questionnaire for users of a kitchen gadget. Which practice most improves the value of the responses?

  1. Piloting the questions on a few users and revising ambiguous items Correct answer.
  2. Offering only yes or no answers for speed
  3. Using as many questions as possible to cover every topic
  4. Asking leading questions that confirm the designer's idea

Explanation

Piloting reveals questions that are ambiguous, leading or misunderstood before the main study, which protects data quality. Leading questions bias results toward the designer's assumption, and excessive length causes fatigue and dropout. Forcing yes or no answers discards the reasoning that qualitative design research needs.

Question 32Design process and problem solving

A team uses a weighted decision matrix and finds that one concept scores highest overall but fails a must criterion on safety. What is the correct action?

  1. Accept it because the total score is highest
  2. Average the score with the second-ranked concept
  3. Increase the weighting of safety until the result changes
  4. Eliminate it, because must criteria act as pass or fail gates Correct answer.

Explanation

Must criteria are absolute gates: a concept that fails one is not admissible regardless of its weighted total. Weighted scores only rank concepts that have already passed every must criterion. Adjusting weights after seeing results is post-hoc manipulation of the method rather than a design decision.

Question 33Design process and problem solving

A design office wants to avoid repeating a mistake made on a previous project. Which practice addresses this most directly?

  1. Buying faster CAD software
  2. Keeping a lessons-learned log reviewed at the start of new projects Correct answer.
  3. Shortening the concept phase of future projects
  4. Hiring more designers for the next project

Explanation

A lessons-learned record captures what went wrong and why, and reviewing it at project start turns past experience into a preventive check. Additional staff, faster tools or a shorter concept phase change capacity or schedule but do not transfer knowledge. Organisational learning depends on deliberate capture and reuse of experience.

Question 34Design process and problem solving

A designer is preparing to present a concept to a client who has no technical background. Which presentation approach is most appropriate?

  1. A spreadsheet of material properties and cost breakdowns
  2. A written report of several thousand words with no visuals
  3. A full set of engineering drawings with dimension callouts
  4. A physical or digital model plus plain-language explanation of benefits and trade-offs Correct answer.

Explanation

A non-technical audience needs to see and understand the proposal, so a model supported by plain-language benefits and trade-offs communicates effectively. Engineering drawings, property tables and long unillustrated reports assume expertise the client does not have. Matching communication to audience is part of professional design practice.

Question 35Design process and problem solving

A team is designing a device for use by elderly users with reduced grip strength. Which requirement statement is written in the most testable form?

  1. The device should look modern and appealing
  2. The device should feel comfortable in the hand
  3. The device ought to be easy for older people to use
  4. The device must be operable with a grip force not exceeding 15 N Correct answer.

Explanation

A testable requirement states a measurable threshold and the condition under which it applies, so it can be verified by measurement. Words such as comfortable, modern or easy express intentions but cannot be checked objectively. Converting such intentions into measurable limits is a core skill in writing specifications.

Question 36Design process and problem solving

During concept evaluation a designer notices that every concept scores poorly on one want criterion. What does this pattern most likely indicate?

  1. The evaluation should be abandoned and a concept chosen by vote
  2. The weighting of all criteria should be equalised
  3. The criterion should be deleted to improve the scores
  4. The concept set may not address that need and further ideation is warranted Correct answer.

Explanation

A uniform weakness across all concepts suggests the ideation did not target that need, so the set needs expanding or reframing rather than the evidence being suppressed. Deleting the criterion hides a real user requirement, and equalising weights or voting discards the structured comparison. Evaluation results should inform the next round of design work.

Question 37Design process and problem solving

A designer must decide whether a proposed hand tool is ready to move into detailed development. Which evidence provides the strongest basis for that gate decision?

  1. The number of sketches produced during ideation
  2. A confident opinion from the most senior engineer
  3. Results from a user trial of a functional prototype against the must criteria Correct answer.
  4. Positive comments from friends who tried the early sketch

Explanation

A stage gate should rest on evidence that the concept meets its must criteria under realistic use, which a trial with a functional prototype provides. Informal comments, seniority and sketch counts are not evidence of fitness against requirements. Basing gate decisions on such proxies raises the risk of costly late failure.

Question 38Design process and problem solving

A team claims its concept is fully optimised, yet no alternative was ever compared against it. How should this claim be judged in design-process terms?

  1. Unsupported only if the concept exceeded its budget
  2. Unsupported, because optimisation requires comparison with alternatives Correct answer.
  3. Valid, provided the concept was modelled in CAD
  4. Valid, because the concept passed all must criteria

Explanation

Optimisation is a comparative judgement: a solution can only be called optimal relative to other candidates assessed on the same criteria. Passing must criteria shows admissibility, not optimality, and CAD modelling or budget compliance does not supply the missing comparison. Without alternatives the claim is a preference rather than a finding.

Question 39Design process and problem solving

A design team is working on a medical device and must balance user needs, regulatory limits and manufacturing cost. Which approach best reflects sound design-process judgement?

  1. Optimise user needs first and treat regulations as a later paperwork step
  2. Treat the three as interacting constraints and iterate the concept until all are satisfied Correct answer.
  3. Freeze the concept before any regulatory review to protect the schedule
  4. Prioritise manufacturing cost because it is the easiest to measure

Explanation

In regulated design, user needs, compliance and cost interact, so the concept must be iterated until every constraint is met rather than sequenced one after another. Deferring regulation or freezing the concept early creates expensive late redesign when limits are discovered. Measurability does not make cost the dominant constraint.

Question 40Design process and problem solving

A design team has finished building a working prototype of a bicycle rack and now wants structured feedback from cyclists before committing to a final design. Which activity best fits this stage of the design process?

  1. Rewriting the original design brief so that it matches the features the prototype already has
  2. Selecting the final manufacturing material before any user has tried the prototype
  3. Producing a marketing brochure that lists the technical specifications of the rack
  4. Running a usability test in which cyclists load and lock bicycles while observers record difficulties Correct answer.

Explanation

Once a prototype exists, the design process moves into testing and evaluation, where real users interact with the artefact and evidence is gathered against the requirements set earlier. Observing cyclists loading and locking bicycles produces specific, actionable data on usability, stability and access. This feedback then feeds the next iteration of the design rather than replacing earlier stages.

Question 41Materials and their properties

A product designer wants a material that can be repeatedly reshaped by heating and cooling, so workshop offcuts can be recycled into new components. Which class of material behaves this way?

  1. Thermoplastic polymer Correct answer.
  2. Elastomer
  3. Thermosetting polymer
  4. Soda-lime glass

Explanation

Thermoplastics soften when heated because their long-chain molecules are held by weak intermolecular forces rather than a rigid cross-linked network, so they can be remelted and remoulded many times. This reversibility is what allows workshop offcuts to be regranulated and reused.

Question 42Materials and their properties

Which property best explains why a steel rule used for measuring on a school workshop bench must be specified as hardened and tempered rather than annealed?

  1. Higher electrical conductivity
  2. Lower density
  3. Greater resistance to permanent bending and wear Correct answer.
  4. Better thermal insulation

Explanation

Hardening and tempering steel raises its yield strength and hardness, so a thin rule resists being bent out of straight or worn at its edges during measuring and marking. Annealed steel is softer and would deform permanently under normal handling.

Question 43Materials and their properties

A batch of pine boards is described as having a moisture content of 12 percent. What does this value represent?

  1. The percentage of the board's length lost to shrinkage
  2. The proportion of sapwood relative to heartwood
  3. The percentage of the board's volume occupied by resin
  4. The mass of water present expressed as a percentage of the oven-dry mass of the wood Correct answer.

Explanation

Moisture content of timber is defined as the mass of water in the sample divided by its oven-dry mass, expressed as a percentage. It is a mass ratio, not a volume or anatomical proportion, and it governs shrinkage and movement in service.

Question 44Materials and their properties

Which material is classified as a ferrous metal because its principal element is iron?

  1. Copper
  2. Aluminium alloy 6082
  3. Zinc
  4. Mild steel Correct answer.

Explanation

Ferrous metals are those based on iron, and mild steel is an iron-carbon alloy with a low carbon content of roughly 0.1 to 0.3 percent. The other options are non-ferrous metals whose base element is not iron.

Question 45Materials and their properties

A designer specifies a ceramic tile for a wall because it will not burn and does not soften at normal service temperatures. Which property is being exploited?

  1. Refractoriness Correct answer.
  2. Toughness
  3. Malleability
  4. Ductility

Explanation

Refractoriness is the ability of a material to withstand high temperature without softening or decomposing, a characteristic of many ceramics because of their strong ionic and covalent bonds. Malleability and ductility are metal properties, and toughness relates to energy absorption before fracture.

Question 46Materials and their properties

Which pair of tests is used to compare the hardness of two metal samples in a school workshop?

  1. File test and centre-punch (indentation) test Correct answer.
  2. Tensile test and impact test
  3. Brinell test and Charpy test
  4. Creep test and fatigue test

Explanation

Simple comparative hardness checks in a workshop use a file, which bites into soft metal but skates over hard metal, and a centre punch struck under controlled force to compare the size of the indentation. Both are relative tests suited to comparing samples rather than producing a calibrated hardness number.

Question 47Materials and their properties

A composite is made by embedding glass fibres in a polyester resin. Which statement correctly identifies the roles of the two constituents?

  1. The fibres act as a filler only and contribute no strength
  2. Both constituents carry equal load because they have the same stiffness
  3. The resin carries the load and the fibres protect the surface
  4. The fibres carry the tensile load and the resin binds them and transfers stress between them Correct answer.

Explanation

In a fibre-reinforced composite the stiff, strong fibres are the principal load-bearing phase, while the continuous matrix resin holds them in position, protects them and transfers stress between adjacent fibres. The two phases have very different stiffness, so they do not share load equally.

Question 48Materials and their properties

Which property of a material is measured by the amount of energy it absorbs before fracturing in a single high-rate blow?

  1. Hardness
  2. Impact strength (toughness) Correct answer.
  3. Elastic limit
  4. Electrical resistivity

Explanation

Impact strength, often called toughness in this context, is the energy absorbed by a specimen when it is struck once at high strain rate before it fractures, commonly measured with a pendulum impact tester. It is distinct from hardness and from the elastic limit.

Question 49Materials and their properties

A workshop stores acrylic sheet and polycarbonate sheet together. Which property difference is the main reason polycarbonate is chosen for a safety guard while acrylic is chosen for a display panel?

  1. Polycarbonate has much higher impact resistance, while acrylic offers better optical clarity and scratch resistance Correct answer.
  2. Polycarbonate is transparent while acrylic is opaque
  3. Polycarbonate has a lower softening temperature than acrylic
  4. Acrylic is a thermoset while polycarbonate is a thermoplastic

Explanation

Polycarbonate is selected for guards because it absorbs impact energy without shattering, whereas acrylic gives superior clarity and surface hardness for display work but is more brittle. Both are transparent thermoplastics, so the remaining options misstate the materials.

Question 50Materials and their properties

A hardwood chair leg is turned so that its grain runs along the length of the leg. Why is this orientation critical to the leg's strength?

  1. Timber is strongest in tension and compression along the grain, so aligning grain with the leg maximises load capacity Correct answer.
  2. Timber is strongest across the grain, so the grain should run perpendicular to the load
  3. Grain running along the leg increases the moisture content
  4. Grain direction affects only the appearance, not the strength

Explanation

Wood is highly anisotropic: its fibres run longitudinally, giving much greater tensile and compressive strength parallel to the grain than across it. A chair leg with grain running along its length therefore resists the compressive and bending loads of use, whereas short-grain or cross-grain sections would fail easily.