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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 131 · 40 questions
TalentJR

Developer's tip (Plan, design, build, check): Find the topic: what apps are, designing apps, or logic and building. Read every screen, list or code line carefully, top to bottom. For code, write each value down step by step and check it again.

NameDateTime takenScore ___ / 40
  1. 1.♿ A screen has 10 icon buttons. Only 2 of them have a text label for screen readers. How many still need a label?
  2. 2.🎯 An app for “everyone” with no clear user usually ___. (a) wins every prize (b) helps nobody well (c) is easy to build (d) needs no testing
  3. 3.🔁 What number does this code show?
    let steps = [1, 3, 20, 9];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
  4. 4.🎨 Who should you test the UX with? (a) only yourself (b) nobody (c) the app icon (d) real users
  5. 5.🔢 When you make an app, which comes first: “release it” or “test the app”? (a) release it (b) test the app
  6. 6.🗒️ You are planning version 1 of a water reminder. Which feature is a MUST-HAVE? (a) water animations (b) custom alert sounds (c) share your streak (d) set a reminder time
  7. 7.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) pick a theme colour (b) share tasks to friends (c) see tasks by day (d) earn stickers
  8. 8.🔁 What number does this code show?
    let runs = [7, 3, 16, 15];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
  9. 9.🗒️ Version 1 of a water reminder must be ready in 11 days. How many days are left for extras after the must-haves?
    set a reminder time: 1 days
    log a glass of water: 4 days
    see today’s total: 2 days
  10. 10.True or false: a wireframe shows the real fonts. (a) True (b) False
  11. 11.True or false: tapping a button is an input. (a) True (b) False
  12. 12.🧩 How many buttons does this app screen have?
    [title] Add Homework
    [button] Help
    [text box] Age
    [button] Save
  13. 13.📅 An app team plans for 3 days, builds for 9 days, tests for 1 days and releases on 1 more day. Planning starts on day 1. On which day does building finish?
  14. 14.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Lessons tab
    2. tap the Lessons tab
    3. tap the Quiz tab
    How many times must you tap Back to reach the main screen of this tab?
  15. 15.🔢 In a quiz-app flow, which comes first: “see the final score” or “pick an answer”? (a) pick an answer (b) see the final score
  16. 16.Which of these makes the app harder to use? (a) big touch targets (b) strong colour contrast (c) colour as the only clue (d) labels on every icon
  17. 17.🔀 What is a user flow? (a) a type of font (b) a colour theme (c) the path through screens (d) a charging cable
  18. 18.💾 What does this code show? (Positions start at 0.)
    let notes = ["Art", "Music", "Science", "Hindi", "Maths"];
    show(notes[3]);     (a) Hindi (b) Science (c) Art (d) Music
  19. 19.🧪 How many of these test cases pass?
    📝 Rule: a quiz is passed with 5 or more right answers.
    function result(right) {
      if (right > 5) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(6) → expected Pass
    Test 2: result(5) → expected Pass
    Test 3: result(4) → expected Try again
  20. 20.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 9, and 100 for everyone else.
    function price(age) {
      if (age <= 9) {
        return 50;
      }
      return 100;
    }
    Test 1: price(12) → expected 100
    Test 2: price(9) → expected 100
    Test 3: price(6) → expected 50     (a) Test 3 (b) Test 2 (c) Test 1
  21. 21.True or false: a blank grey screen solves a real problem. (a) False (b) True
  22. 22.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Add Homework
    [button] Back
    [button] Start
    [text box] Email
    [text box] City
    [button] Send
    [text box] Name
  23. 23.📊 Survey: which problem bugs you most? How many more votes did “forgetting homework” get than “missing the bus”?
    wasting pocket money: 12 votes
    missing the bus: 4 votes
    forgetting homework: 9 votes
  24. 24.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
  25. 25.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let lives = 48; // start at 45
    line 2: lives = lives + 6; // add 6
    line 3: lives = lives * 2; // double it
    line 4: lives = lives + 2; // add 2
    line 5: show(lives); // show it
  26. 26.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 33; // start at 32
    line 2: score = score * 2; // double it
    line 3: score = score - 4; // take away 4
    line 4: show(score); // show it
  27. 27.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(10, 2));
  28. 28.🧩 Which part lets the user give the app information? (a) an input (b) a title (c) a logo (d) an icon
  29. 29.👆 The user taps the button 6 times. What does the label show now?
    let on = false;
    button.onTap = function () {
      on = !on;
      if (on) {
        label.text = "ON";
      } else {
        label.text = "OFF";
      }
    };     (a) OFF (b) ON
  30. 30.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 33; // start at 33
    line 2: lives = lives - 5; // add 5
    line 3: lives = lives * 2; // double it
    line 4: show(lives); // show it     (a) line 2 (b) line 3 (c) line 1
  31. 31.True or false: a tiny 20 px button is good button design. (a) True (b) False
  32. 32.💾 What number does this code show?
    let points = 9;
    points = points - 4;
    points = points + 5;
    show(points);
  33. 33.🔢 In a photo-post flow, which comes first: “add a filter” or “post the photo”? (a) add a filter (b) post the photo
  34. 34.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 10 (c) 0 (d) 2
  35. 35.📱 Where do people usually download phone apps from? (a) a web server (b) an app store (c) a printer (d) a charger
  36. 36.Which of these is a user need? (a) a share button (b) a reminder alarm (c) “I keep missing the bus” (d) a search bar
  37. 37.🔢 When you make an app, what comes right after “plan the screens”? (a) test the app (b) build the app (c) get an idea (d) release it
  38. 38.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(6));
  39. 39.👆 “On tap → do this” links an event to ___. (a) a charger (b) a web address (c) a font (d) an action
  40. 40.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 30;
    }
    show(fee(4) + fee(8));

Answer key

  1. 8
  2. helps nobody well
  3. 33
  4. real users
  5. test the app
  6. set a reminder time
  7. see tasks by day
  8. 41
  9. 4
  10. False
  11. True
  12. 2
  13. 12
  14. 0
  15. pick an answer
  16. colour as the only clue
  17. the path through screens
  18. Hindi
  19. 2
  20. Test 2
  21. False
  22. 3
  23. 5
  24. hard to read
  25. 110
  26. 62
  27. 20
  28. an input
  29. OFF
  30. line 2
  31. False
  32. 10
  33. add a filter
  34. 0
  35. an app store
  36. “I keep missing the bus”
  37. build the app
  38. 12
  39. an action
  40. 30

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