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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 600 · 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 a good flow, each screen should lead to ___. (a) a random page (b) the same screen (c) a clear next step (d) a dead end
  2. 2.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let score = 33; // start at 32
    line 2: score = score * 2; // double it
    line 3: score = score + 3; // add 3
    line 4: score = score * 2; // double it
    line 5: show(score); // show it     (a) line 2 (b) line 3 (c) line 1 (d) line 4
  3. 3.🔐 Which permission does a voice recorder really need? (a) location (b) contacts (c) the microphone (d) the camera
  4. 4.🗒️ You are planning version 1 of a quiz app. Which feature can WAIT for a later version? (a) confetti effects (b) show the score (c) show a question (d) check the answer
  5. 5.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 40 px tall
    Save button: 36 px tall
    Cancel button: 52 px tall
    Next button: 32 px tall
  6. 6.🔀 What number does this shop app show?
    let total = 490;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
  7. 7.Which of these requests is fair? (a) torch → contacts (b) map app → location (c) quiz app → microphone (d) calculator → location
  8. 8.👆 The user taps the button 6 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
  9. 9.🖼️ How many parts (boxes) does this wireframe have?
    [ Add button ]
    [ Save button ]
    [ title text ]
    [ search box ]
    [ big picture ]
    [ menu icon ]
  10. 10.True or false: an app updates from the store. (a) True (b) False
  11. 11.🔀 What number does this shop app show?
    let total = 520;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
  12. 12.🔁 What is the LAST line this code shows?
    let names = ["Meera", "Aman", "Arjun", "Zoya", "Riya"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    }     (a) Hi, Riya (b) Hi, Aman (c) Hi, Arjun (d) Hi, Meera
  13. 13.🔀 With if / else if / else, how many parts run? (a) only one (b) all of them (c) two (d) none
  14. 14.True or false: the game-over page is a screen. (a) True (b) False
  15. 15.🔀 Why plan the user flow before building? (a) to skip testing (b) to hide the buttons (c) so each step is clear (d) to add more taps
  16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 60 px tall
    Back button: 64 px tall
    Save button: 48 px tall
  17. 17.🧭 About how many tabs suit a tab bar best? (a) 20 (b) 3 to 5 (c) 1 (d) 10 to 12
  18. 18.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    no quiet study place: 13 votes
    forgetting birthdays: 8 votes
    missing the bus: 15 votes     (a) no quiet study place (b) forgetting birthdays (c) missing the bus
  19. 19.🗒️ You are planning version 1 of a bus tracker. Which feature is a MUST-HAVE? (a) pick your bus stop (b) rate the driver (c) a dark mode (d) change the bus icon
  20. 20.🔢 After an app is released, which comes first: “list what to fix” or “fix and improve”? (a) fix and improve (b) list what to fix
  21. 21.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Rain", "Monsoon", "Stars", "Sunrise"];
    show(songs[4]);     (a) Monsoon (b) Rain (c) Sunrise (d) Ocean
  22. 22.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
  23. 23.👥 A school app has 90 students, 70 teachers and 50 parents as users. How many users does it have in all?
  24. 24.🧪 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(1000) → expected 0
    Test 2: delivery(650) → expected 40
    Test 3: delivery(700) → expected 0
  25. 25.🧩 Which of these is a button on this screen?
    [title] Sign Up
    [button] Next
    [slider] Volume
    [text box] Due date
    [switch] Sound
    [text box] Age     (a) Age (b) Next (c) Sound (d) Due date
  26. 26.🧰 What does return do in a function? (a) repeats the code (b) closes the screen (c) deletes the app (d) sends back a value
  27. 27.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) processing (b) input (c) output
  28. 28.💡 Which app idea solves this problem: pupils forget due dates? (a) a bill splitter (b) a study-room finder (c) a medicine reminder (d) a homework planner
  29. 29.🔁 What number does this code show?
    let scores = [62, 70, 48];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 50) {
        count = count + 1;
      }
    }
    show(count);
  30. 30.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Caption: 19 px
    Label: 10 px
    Body text: 16 px
    Title: 17 px
    Footer: 26 px     (a) Title (b) Caption (c) Label (d) Body text
  31. 31.True or false: the button colours is about UI (the look). (a) True (b) False
  32. 32.True or false: a page of random dots solves no real problem. (a) True (b) False
  33. 33.♿ A screen has 11 icon buttons. Only 6 of them have a text label for screen readers. How many still need a label?
  34. 34.🔢 In a sign-up flow, which comes FIRST? (a) open the app (b) make a password (c) type name and email (d) tap “Sign up”
  35. 35.🔢 In a sign-up flow, which comes LAST? (a) make a password (b) see the home screen (c) open the app (d) tap “Sign up”
  36. 36.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) set a reminder time (b) see today’s total (c) log a glass of water (d) custom alert sounds
  37. 37.🔁 What does a loop do? (a) saves photos (b) draws icons (c) repeats code (d) deletes code
  38. 38.🧰 What does this code show?
    function greet(name) {
      return "Hello, " + name + "!";
    }
    show(greet("Zoya"));     (a) Hello, Zoya! (b) Hello, name! (c) greet (d) Zoya
  39. 39.🔁 What number does this code show?
    let runs = [1, 1, 19, 14, 2];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
  40. 40.True or false: the settings page is a button. (a) True (b) False

Answer key

  1. a clear next step
  2. line 1
  3. the microphone
  4. confetti effects
  5. 1
  6. 490
  7. map app → location
  8. OFF
  9. 6
  10. True
  11. 470
  12. Hi, Riya
  13. only one
  14. True
  15. so each step is clear
  16. 3
  17. 3 to 5
  18. missing the bus
  19. pick your bus stop
  20. list what to fix
  21. Sunrise
  22. 135
  23. 210
  24. 2
  25. Next
  26. sends back a value
  27. output
  28. a homework planner
  29. 2
  30. Label
  31. True
  32. True
  33. 5
  34. open the app
  35. see the home screen
  36. custom alert sounds
  37. repeats code
  38. Hello, Zoya!
  39. 37
  40. False

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