Worked Study: Every Quiz Question with Its Reasoning
This page collects the questions, correct answers and reasoning from all 14 module quizzes. It reads without JavaScript. Nothing is scored here.
How to use it: answer the quiz yourself first, then read this page. If you read the answers first, the quiz shows what you have read, not what you know. This is not an examination and nothing here counts as a proficiency record.
Modules
- Information and Media Literacy Quiz
- Digital Safety Quiz
- Git and Open Source Quiz
- User Experience and Accessibility Quiz
- Engineering Design Quiz
- Robotics & Coding Starter Quiz
- Robotics Science Quiz
- Robotics Mathematics Quiz
- Responsible AI Quiz
- Sports Technology Quiz
- Technical Communication Quiz
- Technology and the Planet Quiz
- Creative Coding and Game Design Quiz
- Learning How to Learn Quiz
Information and Media Literacy Quiz
Question: Three news stories copy the same research press release. How many separate source chains do these three stories show?
Correct answer: One source chain
Why: Three publications are not three independent confirmations. Follow the shared original source, then look for a separate study that tests the finding.
Question: Which statement makes a claim that can be tested by measurement under stated conditions?
Correct answer: Five runs on a flat course averaged 12 seconds.
Why: Time, course and trial count can be checked. The other statements express preferences as written; that does not make them false, but they are a different kind of statement.
Question: In one class, learners who practise more have higher scores. What does this observation alone support?
Correct answer: Practice time and score are associated in this group.
Why: An association alone does not establish causation. Prior knowledge and study conditions are examples of other factors that need consideration.
Question: Two bars show values of 98 and 100, but the vertical axis starts at 97. What should you check first?
Correct answer: The axis origin and the two-unit difference
Why: The difference is 2 units. A truncated baseline can exaggerate the visual difference, especially in a bar chart; read the values together with the scale.
Question: An AI tool gives a quotation with a book page number. What should you do before putting it in your report?
Correct answer: Check that page in the specified edition.
Why: A convincing reference does not prove that a source or quotation exists. Do not present the quotation as verified when you cannot locate it.
Question: You copied a sentence exactly from a source. Which research note preserves the right distinction?
Correct answer: A marked quotation and source; a separate comment
Why: Keep quotation, summary and interpretation separate. Page or section details help someone locate the wording; a citation is not unlimited permission to reuse a work.
Digital Safety Quiz
Question: A sign-in approval appears on your phone when you are not signing in. What is the best first step?
Correct answer: Reject it; check through the official account route.
Why: Do not authorise a sign-in you did not initiate. Check through the known app or address, not a suspicious accompanying link; seek a trusted adult’s help when needed.
Question: A simple torch app asks for contacts and continuous location access. How should you assess this?
Correct answer: Question whether the permissions are necessary for the function.
Why: Look for a reason connecting each permission to the function. Declining unnecessary access, or choosing an alternative with fewer permissions, limits data sharing.
Question: A link in an “account will close” message asks for your password. How should you check the account?
Correct answer: Check my account through the known app.
Why: A logo, urgency and HTTPS alone do not establish who sent a message. Checking through a known route avoids relying on the message’s link.
Question: You removed a photo’s location tag, but a school sign is visible. What follows?
Correct answer: The sign can still reveal the location.
Why: Privacy is not only about metadata. Consider signs, faces, number plates and regular locations too; do not publish other people’s photographs without permission.
Question: A backup reports “completed”. How can you test whether files can actually be recovered?
Correct answer: Restore a sample to a separate location.
Why: A success message does not replace a restore test. Testing a sample without overwriting the original is a safer way to check recovery.
Question: A password used on one site is exposed. Which habit limits the risk spreading to other accounts?
Correct answer: Use a different strong password for each account
Why: Unique passwords limit reuse of one exposed credential elsewhere. A trustworthy password manager can help store them; additional authentication provides a separate layer of protection.
Git and Open Source Quiz
Question: You stage a file with git add, then edit it again. If you only run git commit, which content is recorded?
Correct answer: The content previously placed in the staging area
Why: A commit records the staging area. To include the later edit, inspect the difference and stage it again.
Question: You fixed an equality boundary in a sensor comparison. Which commit message best describes the change?
Correct answer: Fix stopping at the 10 cm boundary
Why: A useful message identifies the purpose of the change. Generic wording makes it harder to locate a particular fix or decision later.
Question: What is the purpose of trying a feature on a separate branch?
Correct answer: Develop the feature separately from the main branch
Why: A branch provides a separate line of development, not publication, testing or a full device backup. Review the differences and tests before integrating the work.
Question: A shared history contains a faulty commit. Which operation records its inverse while preserving history?
Correct answer: git revert
Why: git revert creates a new commit that reverses selected changes. Conflicts may still need resolution and testing. The other commands inspect status, history or differences.
Question: Two branches changed the same line differently, causing a conflict. How should you proceed?
Correct answer: Check the intentions and test the merged result.
Why: Resolving a conflict is not merely choosing text. Preserve the intended behaviour, remove conflict markers and check the resulting tests.
Question: A code repository is public but has no licence information. What is the right conclusion about reuse?
Correct answer: Being visible does not grant unlimited permission to reuse.
Why: Public availability and permission are different. Check the licence and contribution conditions; do not interpret missing information as permission.
User Experience and Accessibility Quiz
Question: A quiz result is shown only by a green or red border. Which change most directly improves it?
Correct answer: Add correct/incorrect labels alongside colour
Why: Colour should not be the only carrier of meaning. Text and symbols convey the result without colour; screen-reader feedback also needs checking.
Question: Tab reaches the buttons, but you cannot see which one is selected. What is the problem?
Correct answer: Visibility of keyboard focus
Why: Keyboard access requires more than reaching a control: the focus position must be visible. Style the focus indicator rather than removing it.
Question: What is appropriate alt text for a decorative image that adds no information to nearby text?
Correct answer: Empty alt text: alt=""
Why: Empty alt text prevents unnecessary announcement of a decorative image. Do not automatically make the same choice for an informative chart or photograph.
Question: “Saved” appears visually but is not announced by a screen reader. Which check is directly relevant?
Correct answer: The accessible announcement of the status message
Why: An appropriate live region, such as role="status", can announce an update. Adding an attribute is not proof by itself; test the actual interaction.
Question: A lesson video contains speech. Which feature directly supports access to that speech without hearing?
Correct answer: Captions for speech and important sounds
Why: Captions should convey speech and meaningful sounds. Check errors in automatic captions; a title is not an equivalent of the spoken content.
Question: When letters are entered in a number field, which message best supports correction?
Correct answer: Enter a number from 0 to 100. Your input is kept.
Why: A helpful error explains the problem and how to fix it without blaming the user. Preserving the entry reduces unnecessary repeated work.
Engineering Design Quiz
Question: You want to place an exactly 5.0 mm rod in an exactly 4.8 mm hole without force. What do the ideal dimensions imply?
Correct answer: The rod is 0.2 mm wider than the hole.
Why: 5.0 − 4.8 = 0.2 mm. Real production also involves measurement uncertainty, material behaviour and manufacturing tolerances; forcing the parts is not a design solution.
Question: You first want to test whether buttons on a box are easy to reach. Which prototype is a sufficient starting point?
Correct answer: A full-size cardboard layout model
Why: The initial question concerns reach and layout, which a low-cost model can test. It does not prove strength or electrical safety.
Question: A drawing shows a length of 2.5 cm. Which value expresses it in millimetres?
Correct answer: 25 mm
Why: Because 1 cm = 10 mm, 2.5 × 10 = 25 mm. Writing the unit as well as the number helps prevent manufacturing and comparison errors.
Question: You compare two materials for a portable sensor mount. Which record best supports the decision?
Correct answer: A strength, mass, cost and conditions table
Why: Selection depends on the purpose and constraints. One property does not identify the best material for every situation; compare under common conditions.
Question: Which criterion makes “build a good cable holder” testable?
Correct answer: Hold three cables through five specified pull tests.
Why: The cable count, test and success condition become observable. Details such as pulling force and cable dimensions should also be defined before testing.
Question: A prototype failed. If you change material, dimensions and joints at once, what becomes harder to establish?
Correct answer: Which change affected the outcome
Why: Changing several factors at once makes their effects difficult to separate. Use safe comparisons focused on one design question at a time.
Robotics & Coding Starter Quiz
Question: Which component detects light and produces a measurement?
Correct answer: Light sensor
Why: A sensor receives input from the environment. A motor, buzzer and LED can act as output components producing motion, sound and light.
Question: You want to write to a file and close it. Which sequence makes sense?
Correct answer: Open the file → write → close
Why: An operation’s precondition must be satisfied before it runs. In this scenario the file needs to be open before writing.
Question: How many times do you repeat “move forward, turn right 90°” to draw a square?
Correct answer: 4 times
Why: A square has four equal sides. Four equal forward moves and four 90° exterior turns return the drawing to its starting point and direction.
Question: The rule is “stop if distance ≤ 10 cm”. What happens when the reading is 10 cm?
Correct answer: Stop.
Why: The ≤ comparison includes equality. Testing values around the boundary, such as 9, 10 and 11 cm, helps check the rule.
Question: The code runs but gives an unexpected result. Which first step helps locate the fault?
Correct answer: Compare expected and actual output in a small test
Why: A small, reproducible example helps locate the difference. After making a change, run the same test again.
Question: Python runs print("start the motor"). What does this line do by itself?
Correct answer: It writes text to the output.
Why: print produces text output. Physical hardware needs suitable connections, drivers or libraries and hardware commands; printing text does not replace those.
Robotics Science Quiz
Question: A wheel of diameter 10 cm makes one revolution without slipping. Using π ≈ 3, about how far does it travel?
Correct answer: 30 cm
Why: The ideal distance for one revolution is the circumference: π × diameter = 3 × 10 = 30 cm. Slipping and the actual diameter can change the measured result.
Question: A 10-tooth input gear drives a 30-tooth output gear. Ideally, how does output rotational speed compare with input speed?
Correct answer: One third
Why: Output speed is 10/30 of input speed. This ideal ratio follows from tooth counts; losses are a separate issue. Two externally meshing gears rotate in opposite directions.
Question: With the same base and total mass, what does placing a heavy battery lower generally support?
Correct answer: Stability by lowering the centre of mass
Why: A lower centre of mass generally improves resistance to tipping with the same base. Slope, motion and load placement still matter.
Question: You want to compare the effect of wheel diameter on distance travelled. Which setup is fairer?
Correct answer: Test two diameters with the same revolution count and surface
Why: Diameter should be the variable under study. Specify the conditions held constant and record effects such as slipping.
Question: Which error is not removed merely by repeating the same measurement?
Correct answer: A scale error that reads 2 cm too high every time
Why: Repeated measurements help reveal variation, but a fixed bias can remain in all of them. Checking against a known reference is a separate step.
Question: A battery with 12 Wh of usable energy powers a constant 3 W load. What is the ideal runtime?
Correct answer: 4 hours
Why: Time = energy / power = 12 Wh / 3 W = 4 hours. This ideal calculation is not a runtime guarantee; losses and varying load affect the result.
Robotics Mathematics Quiz
Question: A robot travels 2 metres in 4 seconds. What is its average speed over that interval?
Correct answer: 0.5 m/s
Why: Average speed is distance divided by time: 2 / 4 = 0.5 m/s. This does not imply that speed was constant throughout.
Question: The sorted measurements are 2, 3, 3, 4, 28. What is the median?
Correct answer: 3
Why: The third value, in the middle of five, is 3. The arithmetic mean is 8; the outlying value 28 raises the mean.
Question: The range 0–100 is linearly mapped to 0–200. What does 25 map to?
Correct answer: 50
Why: Both ranges start at zero and the span doubles, so 25 × 2 = 50. Different starting points would also require an offset.
Question: A is true and B is false. What is A AND B?
Correct answer: False
Why: AND requires both conditions to be true. OR would require at least one true condition.
Question: Starting at (2, 3), you move +4 in x and −1 in y. What is the new point?
Correct answer: (6, 2)
Why: Update the coordinates separately: x = 2 + 4 = 6 and y = 3 − 1 = 2. Swapping axes or signs produces a different position.
Question: What is binary 101 in decimal?
Correct answer: 5
Why: From right to left the place values are 1, 2 and 4. Thus 1×4 + 0×2 + 1×1 = 5. Binary 101 is not decimal one hundred and one.
Responsible AI Quiz
Question: An AI answer is fluent, but you cannot locate its cited source. What does that show?
Correct answer: Fluent wording is not evidence of accuracy.
Why: Check important claims against accessible, relevant sources. Failure to find a source does not by itself prove a claim false either; it leaves uncertainty.
Question: You want an AI tool to summarise a message containing another child’s phone number and address. What should you do?
Correct answer: Use a fictional example without private data.
Why: Avoid sending unnecessary personal data in the first place. Changing a name alone may not prevent identification; the exercise does not need a real private message.
Question: AI-generated code works on one example. Which is the best next check?
Correct answer: Test normal, boundary and invalid inputs.
Why: One success does not establish correctness for all behaviour. Use small tests, explicit expected results and review any lines you do not understand.
Question: Of 100 images, 95 are cats. A model says “cat” for every image. What can its 95% accuracy hide?
Correct answer: That it recognised none of the non-cats
Why: Overall accuracy can mislead when classes are imbalanced. Inspecting correct and incorrect predictions by class exposes this limitation.
Question: A tool recommends an important decision about students. Which approach is more appropriate?
Correct answer: Request reasons, limitations and human review
Why: High-impact decisions need stronger checks and ways to challenge errors. Human review must be meaningful, not merely approval of an automated result.
Question: You notice a visual glitch in a video. What can you conclude from that alone?
Correct answer: The source and context need further investigation.
Why: Compression or editing can also create visual artefacts. Examining the first publication, date, context and independent sources is stronger than relying on one visual clue.
Sports Technology Quiz
Question: In a 25-frames-per-second video, two events are five frame intervals apart. What is the approximate time?
Correct answer: 0.20 seconds
Why: Time = frame intervals / frames per second = 5 / 25 = 0.20 seconds. Uncertainty in choosing the event boundaries adds measurement uncertainty.
Question: You want to compare your reaction time on two days. Which method is more meaningful?
Correct answer: Repeat with the same tool in comparable conditions
Why: Changing tools or conditions makes the cause of a difference unclear. Examine the distribution and typical result rather than a single record.
Question: A wearable shows an unusual reading. How should that reading alone be treated?
Correct answer: As data with context and device limitations
Why: Measurements in this lesson are not medical diagnoses. Fit, motion and device limitations can affect readings; health concerns require qualified assessment.
Question: A sensor crosses the threshold several times during one step. What can reduce multiple counts for that step?
Correct answer: Add a re-arming condition and waiting period
Why: One movement may produce several high samples. Tune the recount condition against observed steps rather than assuming one timing value fits everyone.
Question: You graph step counts over a week. Which information is needed to interpret the chart?
Correct answer: Days, the step-count unit and the axis scale
Why: Axes, units and scale are necessary for comparison. Mark a missing day as missing data instead of automatically displaying zero steps.
Question: You are preparing a sports-data example for class. Which choice carries less privacy risk?
Correct answer: Fictional data not linked to individuals
Why: Learning to make a chart does not require real people’s health or location data. Clearly label fictional data as an example.
Technical Communication Quiz
Question: Which information is a priority in a README for someone running a project for the first time?
Correct answer: Requirements, run instructions and expected output
Why: Readers need to know what they require, what to do and what success looks like. A short reproducible path is more useful than general praise.
Question: Which columns make a test result checkable?
Correct answer: Input, expectation, result and test conditions
Why: Success should follow a comparison between expected and actual results. Different test conditions can change what a result means.
Question: You tested the robot only on a flat surface. Which report statement is appropriate?
Correct answer: Tested on level ground; not measured on slopes.
Why: Stating the test scope prevents unsupported generalisation. Do not present a test as completed when it was not performed.
Question: You adapted a circuit diagram from another source. How should you acknowledge this?
Correct answer: State the source, reuse terms and adaptation.
Why: Attribution and contribution describe different things: identify the original, explain your changes and check the reuse conditions.
Question: In “sensor → decision code → motor driver → motor”, what should the arrows primarily explain?
Correct answer: The flow of data and control between components
Why: An architecture diagram should explain how components relate. Label data, control and power connections separately when they differ.
Question: The Turkish description says “tested only at 5 V”, but the English has no such limit. What is missing?
Correct answer: Equivalent communication of the technical limit
Why: Language equivalence means preserving meaning and limitations, not matching word counts. Removing the tested condition silently broadens the claim.
Technology and the Planet Quiz
Question: A failed sensor can be replaced without discarding the whole product. Which property supports this?
Correct answer: Modular design with accessible connections
Why: Replaceable parts can increase repair options. Actual benefits also depend on durability, spare-part availability and safe maintenance.
Question: You notice a swollen rechargeable battery in an educational project. What should you do?
Correct answer: Stop using it; tell an adult and do not open it.
Why: Do not experiment with a damaged battery. An adult should arrange safe assessment and suitable collection; do not try opening, puncturing or recharging it.
Question: A 5 W device runs for 2 hours. How much energy does it use?
Correct answer: 10 Wh
Why: Energy = power × time = 5 W × 2 hours = 10 Wh. Power is the rate of consumption; energy is the accumulated consumption over time.
Question: A temperature sensor is in sunlight and the comparison thermometer is in shade. How should you interpret the difference?
Correct answer: Different placements can affect the readings.
Why: Comparison instruments need comparable conditions. Consider location, sunlight, airflow and settling time rather than assuming the difference is a device fault.
Question: You want to reduce lights left on in a classroom. How should you compare initial options?
Correct answer: Compare electronic and non-electronic approaches.
Why: Technology is an option, not the goal itself. Compare the scale of the problem, ease of use, maintenance and cost.
Question: A new device uses less electricity. Is that fact alone enough to decide to replace the old one immediately?
Correct answer: No; production, remaining life and use matter too.
Why: Efficiency during use matters, but total impact is not limited to the use phase. A definite comparison needs an explicit scope and assumptions.
Creative Coding and Game Design Quiz
Question: The game is paused, but score and movement continue. Which check directly helps?
Correct answer: Check the state conditions for updates
Why: Pausing is not just a button appearance. Define which state allows movement, timers and scoring to update.
Question: A character scores on every frame while touching a coin. How can the same coin be counted only once?
Correct answer: Do not count an already collected coin again
Why: An event is different from its contact lasting several frames. A collected state prevents the same object from awarding points repeatedly.
Question: A procedurally generated level contains a bug. Which record helps reproduce it?
Correct answer: The generation seed, inputs and game version
Why: With the same algorithm and inputs, a seed helps reproduce pseudorandom generation. Changing the version or other inputs can change the outcome.
Question: Danger in a game is shown only in red. How can it become more accessible?
Correct answer: Add a shape or text cue as well as colour
Why: Providing the same information in different ways reduces dependence on a single sensory cue. Test players’ control and settings needs as well.
Question: Players repeatedly get stuck at the same obstacle. Which test is more informative?
Correct answer: Observe, then retest with one change
Why: Distinguish problems in instructions, controls and difficulty. Tracking one change helps explain which adjustment made a difference.
Question: Holding a key makes a menu open and close every frame. To toggle it once per press, which event do you need?
Correct answer: The transition from not pressed to pressed
Why: A held-key state and a new key-press event are different. Comparing the previous and current state can identify a single press.
Learning How to Learn Quiz
Question: Which study activity requires retrieving an answer from memory?
Correct answer: Answer with notes closed, then check
Why: Retrieval practice starts by trying to produce an answer without help. Follow it with checking and correction, rather than stopping at a guess.
Question: What is the purpose of distributing the same total study time across several days?
Correct answer: Practise recalling after a time gap
Why: Spaced study aims to use knowledge again over time. Suitable intervals can vary with the topic and recall; one fixed schedule is not a guarantee for everyone.
Question: You answered a question incorrectly. Which note better supports the next attempt?
Correct answer: Wrong step, cause, correction and a new test
Why: An error record describes a changeable step, not your identity. A similar new example helps distinguish learning from memorising the old answer.
Question: Which information is useful and safer when asking for coding help?
Correct answer: A small non-private example and expected output
Why: A small example makes the problem easier to reproduce. Do not include passwords, keys, private messages or personal details in a help request.
Question: Everything seems familiar while reading an example. Which check better shows that you can do it?
Correct answer: Solve a similar new problem without help
Why: Familiarity and independent application are different. Choosing and explaining a method on a new problem makes transfer more visible.
Question: Which goal describes a study action you can carry out today?
Correct answer: I will explain my errors on three loop questions.
Why: A process goal specifies a concrete action within your control. An outcome goal can be useful but does not by itself say what to do in today’s study session.