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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 25 · 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.True or false: a flashcard trainer is a learning app. (a) True (b) False
  2. 2.Which of these is true of the back button? (a) shows 3 to 5 icons (b) opens a list of pages (c) hides extra links (d) undoes one move
  3. 3.🗒️ Version 1 of a water reminder must be ready in 13 days. How many days are left for extras after the must-haves?
    set a reminder time: 3 days
    log a glass of water: 3 days
    see today’s total: 5 days
  4. 4.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) share your streak (b) set a reminder time (c) log a glass of water (d) see today’s total
  5. 5.🧪 What is the ACTUAL result of Test 2?
    🎟️ Rule: a ticket costs 50 for children under 13, and 100 for everyone else.
    function price(age) {
      if (age < 13) {
        return 50;
      }
      return 100;
    }
    Test 1: price(10) → expected 50
    Test 2: price(15) → expected 100
    Test 3: price(13) → expected 100
  6. 6.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 50;
    }
    show(fee(2) + fee(5));
  7. 7.🔍 Which is the odd one out? (a) whether users get lost (b) how fast a task is done (c) how easy sign-up is (d) the font size
  8. 8.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
  9. 9.🖼️ How many parts (boxes) does this wireframe have?
    [ top bar ]
    [ tab bar ]
    [ Add button ]
    [ search box ]
  10. 10.🔍 Which is the odd one out? (a) fast-flashing lights (b) captions on videos (c) sudden loud sounds (d) icons with no labels
  11. 11.Which of these helps everyone use the app? (a) sudden loud sounds (b) colour as the only clue (c) captions on videos (d) icons with no labels
  12. 12.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. tap the Home tab
    2. open “Map”
    3. tap Back
    Which screen are you on now?     (a) Map (b) Profile (c) Search (d) Home
  13. 13.🐞 Finding and fixing bugs is called ___. (a) debugging (b) designing (c) decorating (d) downloading
  14. 14.🔍 Which is the odd one out? (a) whether users get lost (b) how easy sign-up is (c) how fast a task is done (d) the icon shapes
  15. 15.🔐 Is this permission request fair or too much: map app → location? (a) fair (b) too much
  16. 16.💡 Does an app idea like a medicine reminder solve a real problem? (a) No (b) Yes
  17. 17.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 14, and 100 for everyone else.
    function price(age) {
      if (age < 14) {
        return 50;
      }
      return 100;
    }
    Test 1: price(12) → expected 50
    Test 2: price(18) → expected 100
    Test 3: price(20) → expected 100
  18. 18.True or false: a shared to-do list fits saving on the phone. (a) False (b) True
  19. 19.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Offers → Confirm → Cart → Size → Shop → Address
    Design B: Home → Address → Offers → Cart → Shop
  20. 20.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(5) + points(1));
  21. 21.🔢 In a sign-up flow, which comes FIRST? (a) open the app (b) tap “Sign up” (c) enter the code sent (d) see the home screen
  22. 22.🧩 Which of these is a button on this screen?
    [title] Order Snacks
    [text box] Age
    [switch] Remind me
    [button] Back
    [button] Send
    [button] Done     (a) Done (b) Remind me (c) Age
  23. 23.Which colour pair is hard to read? (a) black on yellow (b) white on black (c) black on pale grey (d) yellow on white
  24. 24.🔁 What number does this code show?
    let steps = [1, 13, 1, 19];
    let best = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] > best) {
        best = steps[i];
      }
    }
    show(best);
  25. 25.🔀 Which badge does this quiz app show?
    let marks = 39;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Silver (b) Bronze (c) Gold
  26. 26.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(26));
  27. 27.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 30; // start at 30
    line 2: lives = lives * 3; // double it
    line 3: lives = lives + 2; // add 2
    line 4: lives = lives * 2; // double it
    line 5: show(lives); // show it
  28. 28.True or false: the user presses Save is a timer event. (a) True (b) False
  29. 29.True or false: the user taps Play is a timer event. (a) True (b) False
  30. 30.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
  31. 31.👆 The user types Arjun in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Well done, " + nameBox.text + "!";
    };     (a) Well done, nameBox.text! (b) Arjun (c) Well done! (d) Well done, Arjun!
  32. 32.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. tap the Settings tab
    2. open “Video”
    3. tap Back
    How many times must you tap Back to reach the main screen of this tab?
  33. 33.Which of these is true of a tab bar? (a) hides extra links (b) opens a list of pages (c) undoes one move (d) shows 3 to 5 icons
  34. 34.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    no quiet study place: 11 votes
    forgetting homework: 17 votes
    losing water bottles: 21 votes     (a) forgetting homework (b) losing water bottles (c) no quiet study place
  35. 35.🔀 Which badge does this quiz app show?
    let marks = 94;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Gold (b) Bronze (c) Silver
  36. 36.🧰 In function tip(bill), what is bill? (a) an event (b) a screen (c) a loop (d) a parameter
  37. 37.🔍 Which is the odd one out? (a) a puzzle with levels (b) a torch (c) a unit converter (d) an alarm clock
  38. 38.🗒️ Version 1 of a bus tracker must be ready in 14 days. How many days are left for extras after the must-haves?
    see where the bus is: 4 days
    show arrival time: 4 days
    pick your bus stop: 5 days
  39. 39.Which of these happens at the idea stage? (a) add the buttons (b) spot a problem to solve (c) let friends try it (d) connect the data
  40. 40.🔐 Is this permission request fair or too much: timer → your photos? (a) too much (b) fair

Answer key

  1. True
  2. undoes one move
  3. 2
  4. share your streak
  5. 100
  6. 50
  7. the font size
  8. poor design
  9. 4
  10. captions on videos
  11. captions on videos
  12. Home
  13. debugging
  14. the icon shapes
  15. fair
  16. Yes
  17. 3
  18. False
  19. 2
  20. 70
  21. open the app
  22. Done
  23. yellow on white
  24. 19
  25. Bronze
  26. 78
  27. 124
  28. False
  29. False
  30. easy to read
  31. Well done, Arjun!
  32. 0
  33. shows 3 to 5 icons
  34. losing water bottles
  35. Gold
  36. a parameter
  37. a puzzle with levels
  38. 1
  39. spot a problem to solve
  40. too much

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