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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 65 · 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 badge does this quiz app show?
    let marks = 45;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Bronze (b) Silver (c) Gold
  2. 2.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(29));
  3. 3.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) savings stickers (b) export to a file (c) add money spent (d) pie-chart colours
  4. 4.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Confirm → Menu → Results → Offers → Pens
    Design B: Home → Results → Pay
  5. 5.🎯 A short made-up profile of a typical user is called a ___. (a) pixel (b) password (c) protocol (d) persona
  6. 6.🔢 In a photo-post flow, which comes LAST? (a) write a caption (b) add a filter (c) post the photo (d) take the photo
  7. 7.🗒️ Why keep version 1 small? (a) to use up storage (b) to look bigger (c) to learn from users soon (d) to confuse users
  8. 8.True or false: your last game level fits saving in the cloud. (a) False (b) True
  9. 9.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 44; // start at 44
    line 2: score = score - 4; // take away 4
    line 3: score = score + 2; // add 2
    line 4: score = score * 3; // double it
    line 5: show(score); // show it
  10. 10.🔁 A loop over a list of 5 items runs its body how many times? (a) 5 (b) 1 (c) 4 (d) 6
  11. 11.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 32 px tall
    Help button: 40 px tall
    Start button: 60 px tall
    Next button: 56 px tall
  12. 12.👆 The user types Meera in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Hello, " + nameBox.text + "!";
    };     (a) Hello! (b) Hello, nameBox.text! (c) Meera (d) Hello, Meera!
  13. 13.🎯 Is this a user need or a feature: “Small text is hard”? (a) a user need (b) a feature
  14. 14.✏️ Why draw a wireframe before coding? (a) changes are quick (b) it saves data (c) it adds colours (d) it runs the app
  15. 15.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Lessons tab
    2. tap the Quiz tab
    3. open “Badges”
    4. tap the Me tab
    5. open “Match report”
    Which screen are you on now?     (a) Lessons (b) Quiz (c) Badges (d) Match report
  16. 16.📱 Which one has a home-screen icon: an app or a website? (a) a website (b) an app
  17. 17.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
  18. 18.👆 The user taps the button 5 times. What number does the label show now?
    let score = 8;
    button.onTap = function () {
      score = score + 2;
      label.text = score;
    };
  19. 19.🚀 Which version is newer: 2.6.3 or 2.12.2? (a) 2.12.2 (b) 2.6.3
  20. 20.Which of these is true of a final design? (a) uses plain grey boxes (b) is a quick sketch (c) has no real colours (d) has the real colours
  21. 21.Which of these is about UI (the look)? (a) how easy sign-up is (b) how fast a task is done (c) how users feel after (d) the font size
  22. 22.👆 The user taps the button 4 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 3) {
        likes = likes + 1;
      }
      label.text = likes;
    };
  23. 23.🗒️ A to-do app with no “add a task” feature is ___. (a) well planned (b) missing a must-have (c) ready to release (d) a nice extra
  24. 24.🧭 Which part of navigation undoes one move? (a) a tab bar (b) a menu button (c) the back button
  25. 25.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    wasting pocket money: 18 votes
    missing the bus: 4 votes
    no quiet study place: 7 votes     (a) no quiet study place (b) missing the bus (c) wasting pocket money
  26. 26.📱 Which one has a web address: an app or a website? (a) an app (b) a website
  27. 27.🔢 In a sign-up flow, what comes right after “type name and email”? (a) open the app (b) make a password (c) tap “Sign up” (d) enter the code sent
  28. 28.💡 How can you check that people really have the problem? (a) just guess (b) ask possible users (c) pick a colour (d) copy another app
  29. 29.True or false: you talk to possible users at the test stage. (a) True (b) False
  30. 30.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Friend list”
    2. tap the Profile tab
    3. open “Friend list”
    How many times must you tap Back to reach the main screen of this tab?
  31. 31.✏️ Is this true of a wireframe or of a final design: uses the final pictures? (a) a wireframe (b) a final design
  32. 32.🚀 Which version is newer: 3.7.1 or 3.15.0? (a) 3.7.1 (b) 3.15.0
  33. 33.🔢 In a sign-up flow, which comes first: “make a password” or “type name and email”? (a) make a password (b) type name and email
  34. 34.🔀 When does the else part run? (a) never (b) when the test is true (c) always (d) when the test is false
  35. 35.🔁 What number does this code show?
    let scores = [20, 20, 1, 13, 1];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
  36. 36.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 41; // start at 41
    line 2: stars = stars + 3; // add 2
    line 3: stars = stars + 4; // add 4
    line 4: stars = stars + 6; // add 6
    line 5: show(stars); // show it
  37. 37.🔀 What does this PIN rule show?
    let pin = "53619";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) PIN saved (b) Use 4 digits
  38. 38.🔢 In a food-order flow, which comes first: “pay for the order” or “pick a dish”? (a) pay for the order (b) pick a dish
  39. 39.🧪 How many of these test cases pass?
    🎟️ 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(11) → expected 50
    Test 2: price(19) → expected 100
    Test 3: price(16) → expected 100
  40. 40.True or false: checking a password is an input. (a) True (b) False

Answer key

  1. Bronze
  2. 87
  3. add money spent
  4. 3
  5. persona
  6. post the photo
  7. to learn from users soon
  8. False
  9. 126
  10. 5
  11. 2
  12. Hello, Meera!
  13. a user need
  14. changes are quick
  15. Match report
  16. an app
  17. 10000
  18. 18
  19. 2.12.2
  20. has the real colours
  21. the font size
  22. 3
  23. missing a must-have
  24. the back button
  25. wasting pocket money
  26. a website
  27. make a password
  28. ask possible users
  29. False
  30. 1
  31. a final design
  32. 3.15.0
  33. type name and email
  34. when the test is false
  35. 55
  36. 54
  37. Use 4 digits
  38. pick a dish
  39. 3
  40. False

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