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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 690 · 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.🧩 How many buttons does this app screen have?
    [title] Order Snacks
    [button] Back
    [button] Cancel
    [text box] Name
    [slider] Text size
    [text box] Notes
    [button] Save
    [text box] Email
  2. 2.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Edit photo”
    2. open “Badges”
    3. tap Back
    Which screen are you on now?     (a) Home (b) Edit photo (c) Search (d) Badges
  3. 3.🛠️ At which stage do you connect the data? (a) the plan stage (b) the idea stage (c) the build stage (d) the test stage
  4. 4.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Label: 10 px
    Body text: 23 px
    Menu: 16 px
    Footer: 16 px     (a) Body text (b) Label (c) Footer (d) Menu
  5. 5.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let points = 40; // start at 40
    line 2: points = points * 2; // double it
    line 3: points = points + 5; // add 5
    line 4: points = points + 5; // add 3
    line 5: show(points); // show it
  6. 6.🎯 Which app would help this user most: a teen whose money runs out by Friday? (a) a recipe finder (b) a pocket-money tracker (c) a homework planner (d) a bus tracker
  7. 7.🔢 When you make an app, which comes LAST? (a) release it (b) test the app (c) build the app (d) plan the screens
  8. 8.🎯 Is this a user need or a feature: a dark mode switch? (a) a user need (b) a feature
  9. 9.Which of these is true of a wireframe? (a) uses the final pictures (b) has the real colours (c) uses plain grey boxes (d) shows the real fonts
  10. 10.Which of these is an input? (a) a date picker (b) the home page of an app (c) tap to Send (d) your friends list
  11. 11.🔀 Which badge does this quiz app show?
    let marks = 50;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Bronze (b) Gold (c) Silver
  12. 12.🔢 In a photo-post flow, which comes first: “open the camera screen” or “write a caption”? (a) open the camera screen (b) write a caption
  13. 13.🔀 What does this battery rule show?
    let battery = 15;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    }     (a) Low battery (b) Battery OK
  14. 14.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) add a homework task (b) see tasks by day (c) set a due date (d) pick a theme colour
  15. 15.👆 The user types Arjun in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Hi, " + nameBox.text + "!";
    };     (a) Hi! (b) Hi, nameBox.text! (c) Hi, Arjun! (d) Arjun
  16. 16.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Music", "Maths"];
    notes.pop();
    show(notes[notes.length - 1]);     (a) Art (b) Maths (c) Music
  17. 17.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Confirm → Address → Pay → Size
    Design B: Home → Offers → Address → Pay
  18. 18.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 51; // start at 48
    line 2: stars = stars + 5; // add 5
    line 3: stars = stars + 4; // add 4
    line 4: show(stars); // show it
  19. 19.👆 Two designs for the same task (each arrow is one tap). How many taps does Design A need?
    Design A: Home → Shop → Search
    Design B: Home → Offers → Item → Results → Menu → Confirm → Pay
  20. 20.🧩 What do we call one full page of an app? (a) a screen (b) a variable (c) a cable (d) a battery
  21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 108; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share);     (a) line 3 (b) line 1 (c) line 2 (d) line 4
  22. 22.🧭 About how many tabs suit a tab bar best? (a) 1 (b) 10 to 12 (c) 3 to 5 (d) 20
  23. 23.True or false: an app is installed on a phone. (a) True (b) False
  24. 24.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 44; // start at 44
    line 2: lives = lives + 2; // add 2
    line 3: lives = lives + 2; // double it
    line 4: show(lives); // show it     (a) line 2 (b) line 1 (c) line 3
  25. 25.🐞 After fixing a bug you should ___. (a) delete the test (b) release at once (c) never test (d) test it again
  26. 26.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Rain", "Stars", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]);     (a) Sunrise (b) Rain (c) Stars (d) Ocean
  27. 27.🔀 What number does this shop app show?
    let total = 510;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
  28. 28.👆 What kind of event is this: one second passes? (a) a load event (b) a timer event (c) a text event (d) a tap event
  29. 29.True or false: a big, easy tap area is good button design. (a) True (b) False
  30. 30.👥 A school app has 230 students, 150 teachers and 265 parents as users. Which user group is the biggest? (a) parents (b) teachers (c) students
  31. 31.🧪 A test fails when ___. (a) actual is not expected (b) the font is big (c) both are the same (d) the app is new
  32. 32.🔀 A screen with no way forward or back is called a ___. (a) tab bar (b) dead end (c) shortcut (d) home screen
  33. 33.🔀 What does this PIN rule show?
    let pin = "3358";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) PIN saved (b) Use 4 digits
  34. 34.👆 The user types Zoya in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Hello, " + nameBox.text + "!";
    };     (a) Hello, Zoya! (b) Hello, nameBox.text! (c) Zoya (d) Hello!
  35. 35.👆 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) ON (b) OFF
  36. 36.⚙️ In an app, is a result on screen an input, processing or an output? (a) processing (b) input (c) output
  37. 37.True or false: an app that just says hi solves no real problem. (a) False (b) True
  38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 64 px tall
    Send button: 48 px tall
    Start button: 36 px tall
    Next button: 48 px tall     (a) Next (b) Send (c) Back (d) Start
  39. 39.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
  40. 40.Which of these is a screen? (a) tap to go Next (b) today’s step count (c) tap to Send (d) the game-over page

Answer key

  1. 3
  2. Edit photo
  3. the build stage
  4. Label
  5. 88
  6. a pocket-money tracker
  7. release it
  8. a feature
  9. uses plain grey boxes
  10. a date picker
  11. Silver
  12. open the camera screen
  13. Low battery
  14. pick a theme colour
  15. Hi, Arjun!
  16. Music
  17. 1
  18. 60
  19. 2
  20. a screen
  21. line 3
  22. 3 to 5
  23. True
  24. line 3
  25. test it again
  26. Stars
  27. 460
  28. a timer event
  29. True
  30. parents
  31. actual is not expected
  32. dead end
  33. PIN saved
  34. Hello, Zoya!
  35. ON
  36. output
  37. True
  38. Start
  39. poor design
  40. the game-over page

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