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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 568 · 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?
    function triple(n) {
      return n * 3;
    }
    show(triple(12));
  2. 2.💾 What number does this code show?
    let points = 7;
    points = points - 2;
    points = points + 4;
    show(points);
  3. 3.🚀 In version 2.5.1, which number is the major version? (a) 2 (b) 1 (c) 251 (d) 5
  4. 4.🧪 What is the ACTUAL result of Test 3?
    🎟️ Rule: a ticket costs 50 for children under 12, and 100 for everyone else.
    function price(age) {
      if (age < 12) {
        return 50;
      }
      return 100;
    }
    Test 1: price(15) → expected 100
    Test 2: price(9) → expected 50
    Test 3: price(14) → expected 100
  5. 5.🔁 What number does this code show?
    let steps = [8, 2, 6];
    let best = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] > best) {
        best = steps[i];
      }
    }
    show(best);
  6. 6.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
  7. 7.Which of these is a button? (a) tap to go Next (b) your saved notes (c) the settings page (d) a box to type a name
  8. 8.🔢 In a photo-post flow, what comes right after “add a filter”? (a) open the camera screen (b) post the photo (c) take the photo (d) write a caption
  9. 9.🐞 What is a good first step when an app gives a wrong result? (a) find where it goes wrong (b) buy a new phone (c) add more colours (d) delete the app
  10. 10.True or false: a word battle is a learning app. (a) True (b) False
  11. 11.♿ What should every icon-only button have for screen readers? (a) a bright colour (b) a long animation (c) a text label (d) a sound
  12. 12.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    wasting pocket money: 3 votes
    forgetting homework: 9 votes
    forgetting birthdays: 24 votes     (a) forgetting homework (b) forgetting birthdays (c) wasting pocket money
  13. 13.Which of these makes the app harder to use? (a) text that can grow (b) tiny tap areas (c) captions on videos (d) big touch targets
  14. 14.👆 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
  15. 15.🐞 After fixing a bug you should ___. (a) never test (b) test it again (c) release at once (d) delete the test
  16. 16.🧭 Which part of navigation sits at the bottom? (a) the back button (b) a tab bar (c) a menu button
  17. 17.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    wasting pocket money: 4 votes
    losing water bottles: 11 votes
    no quiet study place: 17 votes     (a) no quiet study place (b) wasting pocket money (c) losing water bottles
  18. 18.🧩 How many buttons does this app screen have?
    [title] Add Homework
    [slider] Brightness
    [text box] Age
    [button] Save
    [button] Send
  19. 19.👆 The user taps the button 4 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 5) {
        likes = likes + 1;
      }
      label.text = likes;
    };
  20. 20.🔢 In a quiz-app flow, which comes first: “see the final score” or “tap “Start quiz””? (a) see the final score (b) tap “Start quiz”
  21. 21.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) a beep sound (d) typing your age
  22. 22.Which of these is processing? (a) a pop-up message (b) sorting the scores (c) taking a photo (d) a beep sound
  23. 23.👥 A school app has 35 students, 260 teachers and 155 parents as users. How many more teachers than students are there?
  24. 24.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 44; // start at 42
    line 2: stars = stars * 2; // double it
    line 3: stars = stars * 2; // double it
    line 4: stars = stars + 3; // add 3
    line 5: show(stars); // show it
  25. 25.📊 Survey: which problem bugs you most? How many students voted in all?
    no quiet study place: 23 votes
    losing water bottles: 21 votes
    forgetting homework: 5 votes
  26. 26.🎯 Who are the users of an app? (a) the people who use it (b) the app icons (c) only the coders (d) only the testers
  27. 27.✏️ What is the easiest way to draw a first wireframe? (a) a 3D printer (b) a microphone (c) pencil and paper (d) a phone case
  28. 28.🧭 Which part of navigation switches main sections? (a) a tab bar (b) a menu button (c) the back button
  29. 29.👥 A cricket club app has 190 players, 105 coaches and 135 fans as users. How many users does it have in all?
  30. 30.⚙️ In an app, is taking a photo an input, processing or an output? (a) input (b) output (c) processing
  31. 31.🔐 Is this permission request fair or too much: map app → location? (a) too much (b) fair
  32. 32.🔀 What does this PIN rule show?
    let pin = "2439";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) PIN saved (b) Use 4 digits
  33. 33.True or false: a clear word like Save is good button design. (a) True (b) False
  34. 34.👆 Code that runs when an event happens is called a ___. (a) hashtag (b) headline (c) handler (d) header
  35. 35.🔁 What number does this code show?
    let marks = [9, 5, 19, 14, 18];
    let total = 0;
    for (let i = 0; i < marks.length; i++) {
      total = total + marks[i];
    }
    show(total);
  36. 36.🚀 Which of these versions is the NEWEST?
    2.20.3, 3.12.5, 3.5.9, 3.3.1     (a) 3.3.1 (b) 3.5.9 (c) 2.20.3 (d) 3.12.5
  37. 37.🗒️ Version 1 of a homework planner must be ready in 11 days. How many days are left for extras after the must-haves?
    add a homework task: 1 days
    set a due date: 3 days
    see tasks by day: 3 days
  38. 38.🗒️ You are planning version 1 of a quiz app. Which feature can WAIT for a later version? (a) show the score (b) show a question (c) check the answer (d) confetti effects
  39. 39.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
  40. 40.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let points = 41; // start at 38
    line 2: points = points * 2; // double it
    line 3: points = points * 2; // double it
    line 4: show(points); // show it

Answer key

  1. 36
  2. 9
  3. 2
  4. 100
  5. 8
  6. good design
  7. tap to go Next
  8. write a caption
  9. find where it goes wrong
  10. False
  11. a text label
  12. forgetting birthdays
  13. tiny tap areas
  14. ON
  15. test it again
  16. a tab bar
  17. no quiet study place
  18. 2
  19. 4
  20. tap “Start quiz”
  21. typing your age
  22. sorting the scores
  23. 225
  24. 171
  25. 49
  26. the people who use it
  27. pencil and paper
  28. a tab bar
  29. 430
  30. input
  31. fair
  32. PIN saved
  33. True
  34. handler
  35. 65
  36. 3.12.5
  37. 4
  38. confetti effects
  39. 28
  40. 164

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