App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 574 · 40 questions

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.

1. 1.🔢 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
2. 2.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let score = 39; // start at 36
   line 2: score = score * 2; // double it
   line 3: score = score - 4; // take away 4
   line 4: show(score); // show it
3. 3.True or false: a final design uses the final pictures. (a) True (b) False
4. 4.👥 A cricket club app has 120 players, 135 coaches and 185 fans as users. Which user group is the biggest? (a) fans (b) coaches (c) players
5. 5.👆 The user taps the button 4 times. What number does the label show now?
   let score = 4;
   button.onTap = function () {
     score = score + 2;
     label.text = score;
   };
6. 6.📊 Survey: which problem bugs you most? Which problem should your app solve first?
   forgetting homework: 6 votes
   losing water bottles: 20 votes
   missing the bus: 24 votes (a) forgetting homework (b) losing water bottles (c) missing the bus
7. 7.🔍 Which is the odd one out? (a) tapping a button (b) taking a photo (c) speaking a command (d) a beep sound
8. 8.Which of these is an input? (a) working out a tip (b) a buzz (vibration) (c) taking a photo (d) a result on screen
9. 9.🐞 This code has a bug. What number does it ACTUALLY show?
   line 1: let coins = 46; // start at 46
   line 2: coins = coins + 3; // add 3
   line 3: coins = coins + 4; // add 2
   line 4: show(coins); // show it
10. 10.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) output (c) input
11. 11.True or false: a pocket-money tracker is the best fit for a child saving up for a cycle. (a) False (b) True
12. 12.💾 What number does this code show?
    let lives = 9;
    lives = lives - 3;
    lives = lives + 5;
    show(lives);
13. 13.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Hint: 10 px
    Body text: 24 px
    Footer: 13 px
    Caption: 10 px
14. 14.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) see today’s total (b) water animations (c) set a reminder time (d) log a glass of water
15. 15.📊 Survey: which problem bugs you most? How many students voted in all?
    forgetting homework: 14 votes
    losing water bottles: 24 votes
    forgetting birthdays: 18 votes
16. 16.🔐 Which permission does a homework photo scanner really need? (a) the microphone (b) location (c) contacts (d) the camera
17. 17.Which of these helps everyone use the app? (a) big touch targets (b) tiny tap areas (c) sudden loud sounds (d) fast-flashing lights
18. 18.🧪 What is the actual result of a test? (a) what the app really does (b) the test’s number (c) the app’s name (d) what we hope for
19. 19.Which of these app ideas solves a real problem? (a) a bill splitter (b) a button with no action (c) a blank grey screen (d) a page of random dots
20. 20.True or false: you talk to possible users at the build stage. (a) True (b) False
21. 21.💾 What number does this code show?
    let score = 5;
    score = score - 1;
    score = score + 4;
    show(score);
22. 22.💡 Does an app idea like a blank grey screen solve a real problem? (a) No (b) Yes
23. 23.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) pick a theme colour (b) earn stickers (c) see tasks by day (d) share tasks to friends
24. 24.🧩 Which of these is a button on this screen?
    [title] Sign Up
    [text box] City
    [button] Start
    [button] Send
    [text box] Subject
    [text box] Age
    [slider] Volume
    [switch] Sound (a) Send (b) Age (c) City (d) Subject
25. 25.🔁 What number does this code show?
    let marks = [21, 34, 14];
    let count = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] >= 70) {
        count = count + 1;
      }
    }
    show(count);
26. 26.🗒️ You are planning version 1 of a quiz app. Which feature can WAIT for a later version? (a) show the score (b) confetti effects (c) check the answer (d) show a question
27. 27.🧪 How many of these test cases pass?
    📝 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(4) → expected Try again
    Test 2: result(6) → expected Pass
    Test 3: result(7) → expected Pass
28. 28.🧭 Which part of navigation sits at the bottom? (a) a menu button (b) a tab bar (c) the back button
29. 29.Which of these fits saving in the cloud? (a) the sound on/off setting (b) your last game level (c) notes to read offline (d) a class leaderboard
30. 30.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 30; // start at 30
    line 2: stars = stars + 2; // add 2
    line 3: stars = stars * 2; // double it
    line 4: stars = stars - 5; // add 5
    line 5: show(stars); // show it (a) line 3 (b) line 4 (c) line 1 (d) line 2
31. 31.🔢 In a quiz-app flow, which comes first: “read a question” or “tap “Start quiz””? (a) read a question (b) tap “Start quiz”
32. 32.🔀 What does this sign-up rule show?
    let age = 8;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
33. 33.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) see tasks by day (b) set a due date (c) add a homework task (d) earn stickers
34. 34.👆 The user taps the button 5 times. What number does the label show now?
    let coins = 6;
    button.onTap = function () {
      coins = coins + 2;
      label.text = coins;
    };
35. 35.🔢 After an app is released, which comes FIRST? (a) release an update (b) list what to fix (c) fix and improve (d) read user reviews
36. 36.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(10, 4));
37. 37.🔁 What is the LAST line this code shows?
    let names = ["Kabir", "Meera", "Arjun"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Meera (b) Hi, Kabir (c) Hi, Arjun
38. 38.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 8 or more right answers.
    function result(right) {
      if (right > 8) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(8) → expected Pass
    Test 2: result(10) → expected Pass
    Test 3: result(5) → expected Try again (a) Test 2 (b) Test 3 (c) Test 1
39. 39.👆 The user types Riya in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Hi, " + nameBox.text + "!";
    }; (a) Hi, nameBox.text! (b) Hi, Riya! (c) Riya (d) Hi!
40. 40.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let score = 49; // start at 48
    line 2: score = score + 3; // add 3
    line 3: score = score + 6; // add 6
    line 4: show(score); // show it (a) line 2 (b) line 3 (c) line 1

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