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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 959 · 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.🧭 Where is a tab bar usually placed in a phone app? (a) nowhere (b) inside a button (c) in the middle (d) at the bottom
  2. 2.🛠️ At which stage do you add the buttons? (a) the release stage (b) the idea stage (c) the plan stage (d) the build stage
  3. 3.👆 What kind of event is this: the app starts up? (a) a load event (b) a timer event (c) a text event (d) a tap event
  4. 4.🧭 Why should every screen show where you are? (a) to look busy (b) so users do not get lost (c) to hide the menu (d) to use more battery
  5. 5.🔀 What does this sign-up rule show?
    let age = 17;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Welcome! (b) Ask a parent
  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 60;
    }
    show(fee(9) + fee(8));
  7. 7.Which of these is about UI (the look)? (a) how easy sign-up is (b) how many taps it takes (c) how users feel after (d) the icon shapes
  8. 8.🧰 What is a function? (a) a named block of code (b) a type of phone (c) a list of colours (d) a screen size
  9. 9.True or false: notes to read offline fits saving on the phone. (a) False (b) True
  10. 10.🐞 After fixing a bug you should ___. (a) test it again (b) never test (c) release at once (d) delete the test
  11. 11.True or false: your last game level fits saving on the phone. (a) True (b) False
  12. 12.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Help page”
    2. open “Edit photo”
    3. tap the Me tab
    4. tap the Quiz tab
    5. tap the Lessons tab
    How many times must you tap Back to reach the main screen of this tab?
  13. 13.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 40 px tall
    Cancel button: 44 px tall
    Start button: 52 px tall
    Back button: 60 px tall
  14. 14.📅 An app team plans for 2 days, builds for 5 days, tests for 1 days and releases on 1 more day. How many days does the whole project take?
  15. 15.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Footer: 14 px
    Hint: 11 px
    Body text: 19 px
  16. 16.🔢 In a food-order flow, which comes first: “pay for the order” or “check the cart”? (a) pay for the order (b) check the cart
  17. 17.🔀 What number does this shop app show?
    let total = 680;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
  18. 18.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 600 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 600) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(400) → expected 40
    Test 2: delivery(800) → expected 0
    Test 3: delivery(600) → expected 0
  19. 19.🚀 Which version is newer: 1.4.16 or 1.4.3? (a) 1.4.16 (b) 1.4.3
  20. 20.Which of these helps everyone use the app? (a) tiny tap areas (b) colour as the only clue (c) labels on every icon (d) sudden loud sounds
  21. 21.True or false: the app starts up is a load event. (a) False (b) True
  22. 22.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 28 px tall. How many px taller must it be?
  23. 23.🔀 What does this battery rule show?
    let battery = 91;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    }     (a) Battery OK (b) Low battery
  24. 24.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Search → Shop → Pens → Item
    Design B: Home → Results → Cart → Offers → Pay → Search     (a) Design B (b) Design A
  25. 25.🔀 What does this PIN rule show?
    let pin = "74746";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) PIN saved (b) Use 4 digits
  26. 26.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 9, and 100 for everyone else.
    function price(age) {
      if (age < 9) {
        return 50;
      }
      return 100;
    }
    Test 1: price(13) → expected 100
    Test 2: price(16) → expected 100
    Test 3: price(7) → expected 50
  27. 27.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    missing the bus: 6 votes
    forgetting birthdays: 7 votes
    losing water bottles: 3 votes     (a) missing the bus (b) forgetting birthdays (c) losing water bottles
  28. 28.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Quiz tab
    2. tap the Me tab
    3. open “Score card”
    Which screen are you on now?     (a) Lessons (b) Me (c) Quiz (d) Score card
  29. 29.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Map”
    2. tap Back
    3. open “Match report”
    4. tap Back
    How many times must you tap Back to reach the main screen of this tab?
  30. 30.👆 “On tap → do this” links an event to ___. (a) a charger (b) a web address (c) an action (d) a font
  31. 31.🔐 Is this permission request fair or too much: calling app → contacts? (a) fair (b) too much
  32. 32.💡 Does an app idea like a button with no action solve a real problem? (a) Yes (b) No
  33. 33.👆 Code that runs when an event happens is called a ___. (a) hashtag (b) handler (c) headline (d) header
  34. 34.🧰 How do you run (call) a function called greet? (a) greet() (b) #greet (c) run greet (d) greet[]
  35. 35.🧰 Why write a function? (a) to hide errors (b) to make code longer (c) to slow the app (d) to reuse code
  36. 36.👆 The user taps the button 2 times. What number does the label show now?
    let score = 10;
    button.onTap = function () {
      score = score + 5;
      label.text = score;
    };
  37. 37.True or false: a big, easy tap area is good button design. (a) True (b) False
  38. 38.🔁 What number does this code show?
    let steps = [9, 10, 11, 18, 4];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
  39. 39.🔁 What number does this code show?
    let steps = [16, 8, 2];
    let best = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] > best) {
        best = steps[i];
      }
    }
    show(best);
  40. 40.🗒️ A to-do app with no “add a task” feature is ___. (a) missing a must-have (b) a nice extra (c) ready to release (d) well planned

Answer key

  1. at the bottom
  2. the build stage
  3. a load event
  4. so users do not get lost
  5. Welcome!
  6. 120
  7. the icon shapes
  8. a named block of code
  9. True
  10. test it again
  11. True
  12. 0
  13. 2
  14. 9
  15. 2
  16. check the cart
  17. 630
  18. 3
  19. 1.4.16
  20. labels on every icon
  21. True
  22. 20
  23. Battery OK
  24. Design A
  25. Use 4 digits
  26. 3
  27. forgetting birthdays
  28. Score card
  29. 0
  30. an action
  31. fair
  32. No
  33. handler
  34. greet()
  35. to reuse code
  36. 20
  37. True
  38. 52
  39. 16
  40. missing a must-have

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