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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 639 · 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 notes = ["Hindi", "Sports", "Science", "Art"];
    notes.push("Maths");
    notes.push("Music");
    show(notes.length);
  2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 24 px tall
    Done button: 56 px tall
    Next button: 60 px tall     (a) Done (b) Next (c) Cancel
  3. 3.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ tab bar ]
    [ menu icon ]
    [ Save button ]
    [ top bar ]
    [ filter buttons ]
    [ big picture ]     (a) tab bar (b) top bar (c) filter buttons (d) big picture
  4. 4.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Help page”
    2. tap the Home tab
    3. open “Friend list”
    4. tap Back
    5. open “Friend list”
    How many times must you tap Back to reach the main screen of this tab?
  5. 5.Which of these happens at the release stage? (a) pick the features (b) sketch the screens (c) write the store text (d) talk to possible users
  6. 6.True or false: a result on screen is an output. (a) False (b) True
  7. 7.🧩 In an app, what is your friends list? (a) data (b) a button (c) a screen (d) an input
  8. 8.🐞 What is a good first step when an app gives a wrong result? (a) find where it goes wrong (b) delete the app (c) add more colours (d) buy a new phone
  9. 9.🔍 Which is the odd one out? (a) the font size (b) the icon shapes (c) the screen layout (d) how many taps it takes
  10. 10.🐞 What is a bug? (a) a fast phone (b) a nice icon (c) a mistake in the code (d) a new feature
  11. 11.🔁 What number does this code show?
    let marks = [5, 12, 15, 16];
    let best = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] > best) {
        best = marks[i];
      }
    }
    show(best);
  12. 12.🎯 Which app would help this user most: a student who keeps forgetting due dates? (a) a recipe finder (b) a homework planner (c) a pocket-money tracker (d) a water reminder
  13. 13.🔢 In a photo-post flow, which comes LAST? (a) open the camera screen (b) write a caption (c) post the photo (d) take the photo
  14. 14.🔢 When you make an app, which comes first: “release it” or “test the app”? (a) test the app (b) release it
  15. 15.🔁 What does a loop do? (a) repeats code (b) deletes code (c) saves photos (d) draws icons
  16. 16.Which of these is about UX (the experience)? (a) the button colours (b) the theme colours (c) how many taps it takes (d) the font size
  17. 17.🔀 What does this sign-up rule show?
    let age = 9;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Welcome! (b) Ask a parent
  18. 18.🔘 Our rule: buttons are at least 48 px tall. The Help button is 24 px tall. How many px taller must it be?
  19. 19.♿ Accessibility means an app works for ___. (a) everyone (b) nobody (c) only the coder (d) only experts
  20. 20.🔁 What number does this code show?
    let marks = [20, 3, 20];
    let total = 0;
    for (let i = 0; i < marks.length; i++) {
      total = total + marks[i];
    }
    show(total);
  21. 21.🔁 What number does this code show?
    let scores = [72, 17, 63, 90, 41];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 40) {
        count = count + 1;
      }
    }
    show(count);
  22. 22.🧪 What is the actual result of a test? (a) the app’s name (b) what we hope for (c) the test’s number (d) what the app really does
  23. 23.🔁 What number does this code show?
    let runs = [15, 22, 16, 20];
    let count = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] >= 60) {
        count = count + 1;
      }
    }
    show(count);
  24. 24.👆 The user taps the button 3 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 3) {
        likes = likes + 1;
      }
      label.text = likes;
    };
  25. 25.🔁 What number does this code show?
    let steps = [2, 17, 1, 2, 16];
    let best = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] > best) {
        best = steps[i];
      }
    }
    show(best);
  26. 26.Which of these is an input? (a) the log-in page (b) a box to type a name (c) tap to Send (d) your saved notes
  27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 44 px tall
    Cancel button: 72 px tall
    Next button: 72 px tall     (a) Send (b) Next (c) Cancel
  28. 28.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 30; // start at 30
    line 2: lives = lives - 7; // take away 4
    line 3: lives = lives - 2; // take away 2
    line 4: show(lives); // show it     (a) line 2 (b) line 3 (c) line 1
  29. 29.🎨 A beautiful app that confuses everyone has ___. (a) perfect UX (b) no UI at all (c) good UX but poor UI (d) good UI but poor UX
  30. 30.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 24 px tall. How many px taller must it be?
  31. 31.True or false: a website opens in a web browser. (a) True (b) False
  32. 32.Which of these requests asks for too much? (a) quiz app → microphone (b) calling app → contacts (c) camera app → camera (d) map app → location
  33. 33.🚀 Your app is at version 1.7.4. The next release fixes a small bug. What is its version number? (a) 1.7.5 (b) 1.8.4 (c) 1.8.0 (d) 2.0.0
  34. 34.🗒️ Version 1 of a homework planner must be ready in 13 days. How many days are left for extras after the must-haves?
    add a homework task: 1 days
    set a due date: 4 days
    see tasks by day: 2 days
  35. 35.True or false: whether users get lost is about UI (the look). (a) True (b) False
  36. 36.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 3 (b) 0, 1, 2 (c) 1, 2, 3 (d) 0, 1, 2, 3
  37. 37.Which of these app ideas solves no real problem? (a) a library due-date alert (b) a lost-and-found board (c) a button with no action (d) a free study-room finder
  38. 38.👆 “On tap → do this” links an event to ___. (a) a font (b) an action (c) a web address (d) a charger
  39. 39.True or false: a blank grey screen solves a real problem. (a) False (b) True
  40. 40.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 41; // start at 39
    line 2: stars = stars - 1; // take away 1
    line 3: stars = stars - 2; // take away 2
    line 4: show(stars); // show it

Answer key

  1. 6
  2. Cancel
  3. big picture
  4. 1
  5. write the store text
  6. True
  7. data
  8. find where it goes wrong
  9. how many taps it takes
  10. a mistake in the code
  11. 16
  12. a homework planner
  13. post the photo
  14. test the app
  15. repeats code
  16. how many taps it takes
  17. Ask a parent
  18. 24
  19. everyone
  20. 43
  21. 4
  22. what the app really does
  23. 0
  24. 3
  25. 17
  26. a box to type a name
  27. Send
  28. line 2
  29. good UI but poor UX
  30. 24
  31. True
  32. quiz app → microphone
  33. 1.7.5
  34. 6
  35. False
  36. 0, 1, 2
  37. a button with no action
  38. an action
  39. False
  40. 38

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