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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 831 · 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 version is newer: 3.16.0 or 3.9.2? (a) 3.9.2 (b) 3.16.0
  2. 2.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // 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 3 (b) line 2 (c) line 4 (d) line 1
  3. 3.🔐 Is this permission request fair or too much: torch → contacts? (a) fair (b) too much
  4. 4.🗒️ You are planning version 1 of a bus tracker. Which feature is a MUST-HAVE? (a) show arrival time (b) a dark mode (c) rate the driver (d) change the bus icon
  5. 5.🚀 Which of these versions is the OLDEST?
    3.2.2, 2.24.9, 3.8.1, 3.13.5     (a) 3.13.5 (b) 3.2.2 (c) 3.8.1 (d) 2.24.9
  6. 6.🎨 UI stands for user ___. (a) input (b) interface (c) internet (d) idea
  7. 7.🛠️ At which stage do you connect the data? (a) the test stage (b) the build stage (c) the idea stage (d) the release stage
  8. 8.Which of these fits saving on the phone? (a) a class leaderboard (b) a draft you are typing (c) photos on two devices (d) a shared to-do list
  9. 9.True or false: an alarm clock is a tool app. (a) False (b) True
  10. 10.💡 How can you check that people really have the problem? (a) ask possible users (b) just guess (c) pick a colour (d) copy another app
  11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 52 px tall
    Done button: 52 px tall
    Next button: 40 px tall     (a) Done (b) Cancel (c) Next
  12. 12.👆 What kind of event is this: the search box changes? (a) a timer event (b) a text event (c) a load event (d) a tap event
  13. 13.🖼️ How many parts (boxes) does this wireframe have?
    [ filter buttons ]
    [ title text ]
    [ Save button ]
    [ big picture ]
    [ menu icon ]
    [ list of items ]
  14. 14.🔀 What does this sign-up rule show?
    let age = 12;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Welcome! (b) Ask a parent
  15. 15.🔍 Which is the odd one out? (a) write the code (b) connect the data (c) let friends try it (d) add the buttons
  16. 16.True or false: a bill splitter solves no real problem. (a) False (b) True
  17. 17.👆 What kind of event is this: the user taps Play? (a) a text event (b) a timer event (c) a load event (d) a tap event
  18. 18.✏️ Is this true of a wireframe or of a final design: uses plain grey boxes? (a) a final design (b) a wireframe
  19. 19.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 11, and 100 for everyone else.
    function price(age) {
      if (age <= 11) {
        return 50;
      }
      return 100;
    }
    Test 1: price(16) → expected 100
    Test 2: price(8) → expected 50
    Test 3: price(11) → expected 100     (a) Test 1 (b) Test 2 (c) Test 3
  20. 20.🔀 What does this sign-up rule show?
    let age = 9;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Ask a parent (b) Welcome!
  21. 21.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Badges”
    2. tap the Lessons tab
    3. open “Edit photo”
    4. tap Back
    5. tap the Me tab
    How many times must you tap Back to reach the main screen of this tab?
  22. 22.🔍 Which is the odd one out? (a) a word battle (b) a racing challenge (c) a flashcard trainer (d) a puzzle with levels
  23. 23.🔢 In a sign-up flow, which comes FIRST? (a) open the app (b) see the home screen (c) tap “Sign up” (d) type name and email
  24. 24.🖼️ In this wireframe (top to bottom), what is right above the big picture?
    [ menu icon ]
    [ title text ]
    [ big picture ]
    [ top bar ]     (a) menu icon (b) title text (c) top bar
  25. 25.💾 What number does this code show?
    let score = 3;
    score = score - 1;
    score = score + 4;
    show(score);
  26. 26.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) log a glass of water (b) see today’s total (c) set a reminder time (d) water animations
  27. 27.🔁 What number does this code show?
    let steps = [91, 93, 95];
    let count = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] >= 50) {
        count = count + 1;
      }
    }
    show(count);
  28. 28.👆 The user taps the button 2 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) OFF (b) ON
  29. 29.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 700 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 700) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(900) → expected 0
    Test 2: delivery(1050) → expected 0
    Test 3: delivery(650) → expected 40
  30. 30.🧪 How many of these test cases pass?
    🎟️ 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(8) → expected 100
    Test 2: price(12) → expected 100
    Test 3: price(4) → expected 50
  31. 31.🧭 About how many tabs suit a tab bar best? (a) 20 (b) 3 to 5 (c) 1 (d) 10 to 12
  32. 32.🐞 What is a bug? (a) a nice icon (b) a fast phone (c) a mistake in the code (d) a new feature
  33. 33.📊 Survey: which problem bugs you most? How many more votes did “missing the bus” get than “no quiet study place”?
    wasting pocket money: 4 votes
    no quiet study place: 10 votes
    missing the bus: 16 votes
  34. 34.🔀 What does this PIN rule show?
    let pin = "1215";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) Use 4 digits (b) PIN saved
  35. 35.Which of these is an input? (a) a box to type a name (b) today’s step count (c) tap to go Next (d) your friends list
  36. 36.True or false: adding up a bill is an input. (a) False (b) True
  37. 37.🚀 Which version is newer: 2.4.13 or 2.4.5? (a) 2.4.13 (b) 2.4.5
  38. 38.♿ Does this help everyone, or make the app harder to use: labels on every icon? (a) helps everyone (b) makes it harder
  39. 39.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(3) + points(5));
  40. 40.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Footer: 14 px
    Label: 21 px
    Menu: 19 px
    Hint: 10 px

Answer key

  1. 3.16.0
  2. line 3
  3. too much
  4. show arrival time
  5. 2.24.9
  6. interface
  7. the build stage
  8. a draft you are typing
  9. True
  10. ask possible users
  11. Next
  12. a text event
  13. 6
  14. Ask a parent
  15. let friends try it
  16. False
  17. a tap event
  18. a wireframe
  19. Test 3
  20. Ask a parent
  21. 0
  22. a flashcard trainer
  23. open the app
  24. title text
  25. 6
  26. water animations
  27. 3
  28. OFF
  29. 3
  30. 3
  31. 3 to 5
  32. a mistake in the code
  33. 6
  34. PIN saved
  35. a box to type a name
  36. False
  37. 2.4.13
  38. helps everyone
  39. 90
  40. 2

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