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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 495 · 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.Which of these is about UI (the look)? (a) the font size (b) how many taps it takes (c) how easy sign-up is (d) how fast a task is done
  2. 2.Which of these is true of a menu button? (a) opens a list of pages (b) switches main sections (c) goes to the last screen (d) undoes one move
  3. 3.🧪 Values right at a limit, like age 12 for “under 12”, are called ___. (a) edge cases (b) old cases (c) easy cases (d) phone cases
  4. 4.True or false: a blank grey screen solves a real problem. (a) False (b) True
  5. 5.True or false: a wireframe looks like the real app. (a) True (b) False
  6. 6.🖼️ In this wireframe (top to bottom), what is right below the Save button?
    [ tab bar ]
    [ search box ]
    [ title text ]
    [ Save button ]
    [ Add button ]
    [ list of items ]     (a) title text (b) Add button (c) tab bar (d) search box
  7. 7.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) you send a message (c) the screen turns off (d) the phone is lost
  8. 8.True or false: the game-over page is a screen. (a) True (b) False
  9. 9.🔁 What number does this code show?
    let scores = [18, 7, 16];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
  10. 10.👆 The user types Zoya in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Welcome, " + nameBox.text + "!";
    };     (a) Welcome, nameBox.text! (b) Welcome, Zoya! (c) Zoya (d) Welcome!
  11. 11.👆 The user taps the button 1 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 2) {
        likes = likes + 1;
      }
      label.text = likes;
    };
  12. 12.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 46; // start at 46
    line 2: stars = stars - 2; // take away 2
    line 3: stars = stars + 4; // add 3
    line 4: stars = stars - 5; // take away 5
    line 5: show(stars); // show it
  13. 13.🚀 Which version is newer: 4.11.0 or 4.4.3? (a) 4.4.3 (b) 4.11.0
  14. 14.💾 pop() takes off the last item. What does this code show?
    let songs = ["Rain", "Stars", "Sunrise", "Kites", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]);     (a) Stars (b) Sunrise (c) Rain (d) Kites
  15. 15.🔢 In a sign-up flow, which comes FIRST? (a) see the home screen (b) type name and email (c) make a password (d) open the app
  16. 16.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 60;
    }
    show(fee(9) + fee(1));
  17. 17.🔐 Is this permission request fair or too much: map app → location? (a) too much (b) fair
  18. 18.✏️ Is this true of a wireframe or of a final design: has no real colours? (a) a final design (b) a wireframe
  19. 19.🔐 Is this permission request fair or too much: timer → your photos? (a) too much (b) fair
  20. 20.True or false: a wireframe shows where things go. (a) False (b) True
  21. 21.Which of these app ideas solves no real problem? (a) a medicine reminder (b) a button with no action (c) a library due-date alert (d) a free study-room finder
  22. 22.🔁 What number does this code show?
    let runs = [14, 12, 8, 19, 17];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
  23. 23.🧩 How many buttons does this app screen have?
    [title] Order Snacks
    [button] Cancel
    [button] Done
    [button] Start
    [text box] Notes
  24. 24.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let lives = 51; // start at 50
    line 2: lives = lives - 4; // take away 4
    line 3: lives = lives + 2; // add 2
    line 4: show(lives); // show it
  25. 25.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 8 or more right answers.
    function result(right) {
      if (right > 8) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(10) → expected Pass
    Test 2: result(8) → expected Pass
    Test 3: result(7) → expected Try again     (a) Test 3 (b) Test 1 (c) Test 2
  26. 26.📊 Survey: which problem bugs you most? How many students voted in all?
    losing water bottles: 18 votes
    forgetting homework: 13 votes
    forgetting birthdays: 19 votes
  27. 27.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
  28. 28.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) earn stickers (b) see tasks by day (c) pick a theme colour (d) share tasks to friends
  29. 29.Which of these happens at the test stage? (a) list what users need (b) write the code (c) try every button (d) add the buttons
  30. 30.🧭 About how many tabs suit a tab bar best? (a) 20 (b) 1 (c) 10 to 12 (d) 3 to 5
  31. 31.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
  32. 32.🔁 What number does this code show?
    let runs = [10, 4, 12, 3, 13];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
  33. 33.🗂️ What kind of app is a puzzle with levels? (a) a tool app (b) a learning app (c) a health app (d) a game
  34. 34.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 41; // start at 41
    line 2: score = score - 5; // add 5
    line 3: score = score * 2; // double it
    line 4: show(score); // show it
  35. 35.🗒️ Version 1 of a homework planner must be ready in 14 days. How many days are left for extras after the must-haves?
    add a homework task: 4 days
    set a due date: 4 days
    see tasks by day: 2 days
  36. 36.🔀 What does this sign-up rule show?
    let age = 16;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Welcome! (b) Ask a parent
  37. 37.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
  38. 38.True or false: a draft you are typing fits saving in the cloud. (a) True (b) False
  39. 39.🔁 What number does this code show?
    let scores = [94, 99, 62];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 70) {
        count = count + 1;
      }
    }
    show(count);
  40. 40.Which of these is true of an app? (a) opens in a web browser (b) comes from an app store (c) needs no installing (d) opens from a link

Answer key

  1. the font size
  2. opens a list of pages
  3. edge cases
  4. False
  5. False
  6. Add button
  7. the phone is lost
  8. True
  9. 41
  10. Welcome, Zoya!
  11. 1
  12. 43
  13. 4.11.0
  14. Kites
  15. open the app
  16. 60
  17. fair
  18. a wireframe
  19. too much
  20. True
  21. a button with no action
  22. 70
  23. 3
  24. 49
  25. Test 2
  26. 50
  27. in the cloud
  28. see tasks by day
  29. try every button
  30. 3 to 5
  31. True
  32. 42
  33. a game
  34. 72
  35. 4
  36. Welcome!
  37. good design
  38. False
  39. 2
  40. comes from an app store

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