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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 899 · 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.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 3 (b) 0, 1, 2, 3 (c) 1, 2, 3 (d) 0, 1, 2
  2. 2.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
  3. 3.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Item → Search → Offers
    Design B: Home → Item → Pay → Address → Menu → Pens
  4. 4.🔢 In a quiz-app flow, which comes first: “see the final score” or “tap “Start quiz””? (a) see the final score (b) tap “Start quiz”
  5. 5.🔀 What does this PIN rule show?
    let pin = "173";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) Use 4 digits (b) PIN saved
  6. 6.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 6 or more right answers.
    function result(right) {
      if (right > 6) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(7) → expected Pass
    Test 2: result(6) → expected Pass
    Test 3: result(3) → expected Try again     (a) Test 1 (b) Test 3 (c) Test 2
  7. 7.True or false: adding up a bill is an input. (a) False (b) True
  8. 8.🔍 Which is the odd one out? (a) labels on every icon (b) tiny tap areas (c) big touch targets (d) strong colour contrast
  9. 9.👆 The user taps the button 7 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) ON (b) OFF
  10. 10.🔍 Which is the odd one out? (a) add the buttons (b) write down the bugs (c) connect the data (d) write the code
  11. 11.🧭 Which part of navigation hides extra links? (a) a menu button (b) the back button (c) a tab bar
  12. 12.🔁 What does a loop do? (a) deletes code (b) draws icons (c) repeats code (d) saves photos
  13. 13.🧰 What is a function? (a) a screen size (b) a type of phone (c) a named block of code (d) a list of colours
  14. 14.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
  15. 15.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 34; // start at 34
    line 2: lives = lives * 2; // double it
    line 3: lives = lives + 1; // take away 1
    line 4: lives = lives * 2; // double it
    line 5: show(lives); // show it
  16. 16.🔢 In a food-order flow, which comes LAST? (a) check the cart (b) track the order (c) pay for the order (d) open the menu
  17. 17.🗒️ Version 1 of a quiz app must be ready in 9 days. How many days are left for extras after the must-haves?
    show a question: 1 days
    check the answer: 4 days
    show the score: 4 days
  18. 18.True or false: a pocket-money tracker is the best fit for a teen whose money runs out by Friday. (a) False (b) True
  19. 19.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 42; // start at 42
    line 2: stars = stars + 7; // add 4
    line 3: stars = stars - 5; // take away 5
    line 4: show(stars); // show it
  20. 20.🔀 In this course’s code, which sign tests “is equal to”? (a) !== (b) => (c) === (d) =
  21. 21.👆 The user types Kabir in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Hello, " + nameBox.text + "!";
    };     (a) Hello, nameBox.text! (b) Kabir (c) Hello! (d) Hello, Kabir!
  22. 22.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Me tab
    2. open “Badges”
    3. open “Help page”
    4. tap Back
    Which screen are you on now?     (a) Quiz (b) Help page (c) Badges (d) Lessons
  23. 23.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Menu: 19 px
    Body text: 14 px
    Label: 12 px
    Title: 13 px
  24. 24.Which of these requests is fair? (a) torch → contacts (b) calculator → location (c) timer → your photos (d) map app → location
  25. 25.Which of these fits saving on the phone? (a) chat messages to friends (b) photos on two devices (c) a class leaderboard (d) notes to read offline
  26. 26.Which of these is true of a menu button? (a) opens a list of pages (b) goes to the last screen (c) undoes one move (d) shows 3 to 5 icons
  27. 27.🗂️ What kind of app is a sleep tracker? (a) a tool app (b) a health app (c) a learning app (d) a game
  28. 28.🎯 Which app would help this user most: a runner who forgets to sip water? (a) a bus tracker (b) a big-text reader (c) a water reminder (d) a recipe finder
  29. 29.🔍 Which is the odd one out? (a) whether users get lost (b) how users feel after (c) how easy sign-up is (d) the screen layout
  30. 30.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 40; // start at 40
    line 2: stars = stars - 4; // take away 3
    line 3: stars = stars - 4; // take away 4
    line 4: show(stars); // show it     (a) line 2 (b) line 1 (c) line 3
  31. 31.🔀 A screen with no way forward or back is called a ___. (a) dead end (b) home screen (c) tab bar (d) shortcut
  32. 32.🖼️ In this wireframe (top to bottom), what is right above the big picture?
    [ list of items ]
    [ big picture ]
    [ Save button ]
    [ Add button ]
    [ menu icon ]     (a) Save button (b) list of items (c) menu icon (d) Add button
  33. 33.♿ A screen has 10 icon buttons. Only 6 of them have a text label for screen readers. How many still need a label?
  34. 34.♿ Accessibility means an app works for ___. (a) only experts (b) only the coder (c) nobody (d) everyone
  35. 35.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    missing the bus: 13 votes
    wasting pocket money: 3 votes
    no quiet study place: 9 votes     (a) missing the bus (b) wasting pocket money (c) no quiet study place
  36. 36.🔢 In a photo-post flow, which comes first: “post the photo” or “take the photo”? (a) post the photo (b) take the photo
  37. 37.🔢 In a sign-up flow, which comes FIRST? (a) make a password (b) open the app (c) tap “Sign up” (d) enter the code sent
  38. 38.🔀 Which badge does this quiz app show?
    let marks = 95;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Silver (b) Gold (c) Bronze
  39. 39.True or false: an app is installed on a phone. (a) False (b) True
  40. 40.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);

Answer key

  1. 0, 1, 2
  2. poor design
  3. 2
  4. tap “Start quiz”
  5. Use 4 digits
  6. Test 2
  7. False
  8. tiny tap areas
  9. ON
  10. write down the bugs
  11. a menu button
  12. repeats code
  13. a named block of code
  14. True
  15. 134
  16. track the order
  17. 0
  18. True
  19. 44
  20. ===
  21. Hello, Kabir!
  22. Badges
  23. 3
  24. map app → location
  25. notes to read offline
  26. opens a list of pages
  27. a health app
  28. a water reminder
  29. the screen layout
  30. line 2
  31. dead end
  32. list of items
  33. 4
  34. everyone
  35. missing the bus
  36. take the photo
  37. open the app
  38. Gold
  39. True
  40. 50

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