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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 793 · 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.🔢 When you make an app, which comes LAST? (a) build the app (b) test the app (c) release it (d) get an idea
  2. 2.♿ A screen has 7 icon buttons. Only 2 of them have a text label for screen readers. How many still need a label?
  3. 3.🎯 Which app would help this user most: a parent waiting at the bus stop? (a) a big-text reader (b) a bus tracker (c) a recipe finder (d) a homework planner
  4. 4.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let score = 30; // start at 30
    line 2: score = score + 4; // add 4
    line 3: score = score - 4; // take away 3
    line 4: score = score + 4; // add 4
    line 5: show(score); // show it
  5. 5.👆 The user types Aman 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! (b) Aman (c) Well done, nameBox.text! (d) Well done, Aman!
  6. 6.🗒️ You are planning version 1 of a quiz app. Which feature is a MUST-HAVE? (a) confetti effects (b) background music (c) an avatar shop (d) show the score
  7. 7.True or false: tap to Send is a button. (a) True (b) False
  8. 8.Which of these app ideas solves no real problem? (a) a free study-room finder (b) a lost-and-found board (c) a blank grey screen (d) a bill splitter
  9. 9.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Label: 22 px
    Menu: 11 px
    Footer: 22 px
    Title: 17 px
  10. 10.🧰 In function tip(bill), what is bill? (a) an event (b) a parameter (c) a screen (d) a loop
  11. 11.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
  12. 12.🔁 What is the LAST line this code shows?
    let names = ["Meera", "Kabir", "Aman"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    }     (a) Hi, Aman (b) Hi, Meera (c) Hi, Kabir
  13. 13.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Friend list”
    2. tap Back
    3. open “Match report”
    Which screen are you on now?     (a) Search (b) Match report (c) Home (d) Friend list
  14. 14.💡 Which app idea solves this problem: nobody knows whose bag it is? (a) a bill splitter (b) a lost-and-found board (c) a study-room finder (d) a medicine reminder
  15. 15.True or false: a blank grey screen solves a real problem. (a) True (b) False
  16. 16.🔢 In a sign-up flow, which comes LAST? (a) open the app (b) enter the code sent (c) see the home screen (d) tap “Sign up”
  17. 17.♿ Does this help everyone, or make the app harder to use: captions on videos? (a) makes it harder (b) helps everyone
  18. 18.True or false: an app is installed on a phone. (a) True (b) False
  19. 19.🔁 What number does this code show?
    let runs = [1, 12, 14];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
  20. 20.🗒️ Version 1 of a bus tracker must be ready in 9 days. How many days are left for extras after the must-haves?
    see where the bus is: 1 days
    show arrival time: 4 days
    pick your bus stop: 2 days
  21. 21.🧭 What does the back button usually do? (a) closes all apps (b) goes to the last screen (c) opens settings (d) deletes the page
  22. 22.📱 Which one has a home-screen icon: an app or a website? (a) an app (b) a website
  23. 23.🔀 What does this PIN rule show?
    let pin = "2130";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) PIN saved (b) Use 4 digits
  24. 24.🔁 What is the LAST line this code shows?
    let names = ["Arjun", "Kabir", "Meera", "Aman", "Riya"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    }     (a) Hi, Kabir (b) Hi, Meera (c) Hi, Arjun (d) Hi, Riya
  25. 25.True or false: a slider for volume is a screen. (a) False (b) True
  26. 26.💾 pop() takes off the last item. What does this code show?
    let notes = ["Sports", "Music", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Music (b) Maths (c) Sports
  27. 27.🧩 Which input is best for choosing a volume level? (a) a switch (b) a slider (c) a title (d) a text box
  28. 28.Which of these is a user need? (a) a share button (b) a reminder alarm (c) “I forget my homework” (d) a dark mode switch
  29. 29.📊 Survey: which problem bugs you most? How many more votes did “forgetting birthdays” get than “forgetting homework”?
    forgetting homework: 9 votes
    forgetting birthdays: 12 votes
    no quiet study place: 25 votes
  30. 30.📱 Where do people usually download phone apps from? (a) an app store (b) a web server (c) a charger (d) a printer
  31. 31.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 85; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total);     (a) line 2 (b) line 4 (c) line 1 (d) line 3
  32. 32.🗒️ Version 1 of a pocket-money tracker must be ready in 15 days. How many days are left for extras after the must-haves?
    add money received: 1 days
    add money spent: 3 days
    show the balance: 5 days
  33. 33.💾 In most code, the first item of a list is at position ___. (a) 1 (b) 10 (c) 2 (d) 0
  34. 34.🧩 Which of these is a button on this screen?
    [title] Order Snacks
    [button] Help
    [button] Next
    [button] Send
    [slider] Volume
    [switch] Sound
    [text box] Subject     (a) Sound (b) Volume (c) Subject (d) Help
  35. 35.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 8, and 100 for everyone else.
    function price(age) {
      if (age <= 8) {
        return 50;
      }
      return 100;
    }
    Test 1: price(11) → expected 100
    Test 2: price(4) → expected 50
    Test 3: price(8) → expected 100     (a) Test 2 (b) Test 3 (c) Test 1
  36. 36.True or false: the log-in page is an input. (a) False (b) True
  37. 37.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Edit photo”
    2. tap the Chat tab
    3. tap the Chat tab
    4. tap the Feed tab
    Which screen are you on now?     (a) Feed (b) Settings (c) Chat (d) Edit photo
  38. 38.🔀 In a good flow, each screen should lead to ___. (a) a dead end (b) a clear next step (c) the same screen (d) a random page
  39. 39.True or false: the home page of an app is a screen. (a) False (b) True
  40. 40.🔁 What number does this code show?
    let runs = [18, 12, 17];
    let best = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] > best) {
        best = runs[i];
      }
    }
    show(best);

Answer key

  1. release it
  2. 5
  3. a bus tracker
  4. 35
  5. Well done, Aman!
  6. show the score
  7. True
  8. a blank grey screen
  9. 1
  10. a parameter
  11. hard to read
  12. Hi, Aman
  13. Match report
  14. a lost-and-found board
  15. False
  16. see the home screen
  17. helps everyone
  18. True
  19. 27
  20. 2
  21. goes to the last screen
  22. an app
  23. PIN saved
  24. Hi, Riya
  25. False
  26. Music
  27. a slider
  28. “I forget my homework”
  29. 3
  30. an app store
  31. line 3
  32. 6
  33. 0
  34. Help
  35. Test 3
  36. False
  37. Feed
  38. a clear next step
  39. True
  40. 18

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