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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 412 · 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.🔁 What number does this code show?
    let runs = [12, 15, 2, 14];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
  2. 2.🎯 Which app would help this user most: a teen whose money runs out by Friday? (a) a homework planner (b) a big-text reader (c) a water reminder (d) a pocket-money tracker
  3. 3.Which of these is about UI (the look)? (a) how users feel after (b) how fast a task is done (c) the screen layout (d) whether users get lost
  4. 4.🔀 In this course’s code, which sign tests “is equal to”? (a) !== (b) = (c) => (d) ===
  5. 5.🗒️ Version 1 of a homework planner must be ready in 9 days. How many days are left for extras after the must-haves?
    add a homework task: 1 days
    set a due date: 2 days
    see tasks by day: 5 days
  6. 6.🔢 In a photo-post flow, which comes first: “post the photo” or “take the photo”? (a) post the photo (b) take the photo
  7. 7.🔢 In a sign-up flow, which comes FIRST? (a) see the home screen (b) make a password (c) type name and email (d) open the app
  8. 8.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let coins = 49; // start at 46
    line 2: coins = coins + 4; // add 4
    line 3: coins = coins + 4; // add 4
    line 4: coins = coins + 2; // add 2
    line 5: show(coins); // show it
  9. 9.🔢 In a sign-up flow, which comes first: “tap “Sign up”” or “make a password”? (a) tap “Sign up” (b) make a password
  10. 10.👆 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!
  11. 11.🔍 Which is the odd one out? (a) a flashcard trainer (b) a word battle (c) a cricket run chase (d) a puzzle with levels
  12. 12.⚙️ What number does this app show?
    let price = 520; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  13. 13.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    missing the bus: 24 votes
    losing water bottles: 17 votes
    wasting pocket money: 9 votes     (a) losing water bottles (b) wasting pocket money (c) missing the bus
  14. 14.🔀 In a good flow, each screen should lead to ___. (a) the same screen (b) a random page (c) a dead end (d) a clear next step
  15. 15.🧩 In an app, what is your friends list? (a) an input (b) a button (c) a screen (d) data
  16. 16.🗒️ The first small, working version of an app is often called an ___. (a) CPU (b) MVP (c) FAQ (d) URL
  17. 17.💾 What does this code show? (Positions start at 0.)
    let notes = ["Maths", "Music", "Sports", "Art"];
    show(notes[3]);     (a) Maths (b) Music (c) Art (d) Sports
  18. 18.True or false: a result on screen is an input. (a) True (b) False
  19. 19.Which of these is true of an app? (a) needs no installing (b) opens in a web browser (c) comes from an app store (d) has a web address
  20. 20.True or false: a wireframe has the real colours. (a) False (b) True
  21. 21.👆 The user taps the button 4 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
  22. 22.👥 A clinic app has 135 patients, 260 doctors and 200 nurses as users. Which user group is the biggest? (a) patients (b) nurses (c) doctors
  23. 23.True or false: a website comes from an app store. (a) True (b) False
  24. 24.👆 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) OFF (b) ON
  25. 25.Which colour pair is easy to read? (a) light grey on white (b) black on pale grey (c) dark blue on black (d) red on green
  26. 26.🗒️ You are planning version 1 of a pocket-money tracker. Which feature can WAIT for a later version? (a) add money spent (b) add money received (c) show the balance (d) savings stickers
  27. 27.🐞 A comment in code (after //) is for ___. (a) people reading the code (b) the battery (c) the phone screen (d) the app store
  28. 28.🖼️ In this wireframe (top to bottom), what is right above the title text?
    [ list of items ]
    [ top bar ]
    [ Add button ]
    [ title text ]     (a) list of items (b) Add button (c) top bar
  29. 29.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total);     (a) line 2 (b) line 3 (c) line 1 (d) line 4
  30. 30.🧰 What is a function? (a) a type of phone (b) a list of colours (c) a screen size (d) a named block of code
  31. 31.True or false: you talk to possible users at the idea stage. (a) False (b) True
  32. 32.🔁 What number does this code show?
    let runs = [9, 3, 17];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
  33. 33.♿ A screen has 8 icon buttons. Only 1 of them have a text label for screen readers. How many still need a label?
  34. 34.🛠️ At which stage do you try every button? (a) the build stage (b) the test stage (c) the release stage (d) the plan stage
  35. 35.🐞 After fixing a bug you should ___. (a) release at once (b) test it again (c) never test (d) delete the test
  36. 36.🎨 Is this about UI or UX: the screen layout? (a) UX (b) UI
  37. 37.🧪 What is the ACTUAL result of Test 3?
    🎟️ 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(8) → expected 50
    Test 2: price(15) → expected 100
    Test 3: price(16) → expected 100
  38. 38.🧭 About how many tabs suit a tab bar best? (a) 1 (b) 3 to 5 (c) 10 to 12 (d) 20
  39. 39.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 30;
    }
    show(fee(8) + fee(1));
  40. 40.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 10, and 100 for everyone else.
    function price(age) {
      if (age <= 10) {
        return 50;
      }
      return 100;
    }
    Test 1: price(10) → expected 100
    Test 2: price(11) → expected 100
    Test 3: price(8) → expected 50

Answer key

  1. 43
  2. a pocket-money tracker
  3. the screen layout
  4. ===
  5. 1
  6. take the photo
  7. open the app
  8. 56
  9. tap “Sign up”
  10. Hello, Kabir!
  11. a flashcard trainer
  12. 500
  13. missing the bus
  14. a clear next step
  15. data
  16. MVP
  17. Art
  18. False
  19. comes from an app store
  20. False
  21. OFF
  22. doctors
  23. False
  24. ON
  25. black on pale grey
  26. savings stickers
  27. people reading the code
  28. Add button
  29. line 3
  30. a named block of code
  31. True
  32. 29
  33. 7
  34. the test stage
  35. test it again
  36. UI
  37. 100
  38. 3 to 5
  39. 30
  40. 2

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