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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 341 · 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 does this code show?
    function greet(name) {
      return "Welcome, " + name + "!";
    }
    show(greet("Zoya"));     (a) Welcome, Zoya! (b) greet (c) Zoya (d) Welcome, name!
  2. 2.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) pick a theme colour (b) see tasks by day (c) share tasks to friends (d) earn stickers
  3. 3.🔀 What does if / else let an app do? (a) repeat forever (b) save a photo (c) pick one of two actions (d) draw a screen
  4. 4.👆 The user types Aman in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Well done, " + nameBox.text + "!";
    };     (a) Well done! (b) Aman (c) Well done, Aman! (d) Well done, nameBox.text!
  5. 5.🧪 A test case is an input together with its ___. (a) expected result (b) screen colour (c) app icon (d) font size
  6. 6.True or false: icons with no meaning is good button design. (a) False (b) True
  7. 7.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 1, 2, 3 (b) 3 (c) 0, 1, 2, 3 (d) 0, 1, 2
  8. 8.🔀 What does this battery rule show?
    let battery = 22;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    }     (a) Low battery (b) Battery OK
  9. 9.🔢 In a quiz-app flow, which comes LAST? (a) read a question (b) see if it is right (c) tap “Start quiz” (d) see the final score
  10. 10.👆 The user taps the button 4 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 4) {
        likes = likes + 1;
      }
      label.text = likes;
    };
  11. 11.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) add a homework task (b) share tasks to friends (c) see tasks by day (d) set a due date
  12. 12.🗒️ Version 1 of a water reminder must be ready in 7 days. How many days are left for extras after the must-haves?
    set a reminder time: 3 days
    log a glass of water: 1 days
    see today’s total: 3 days
  13. 13.💡 Which app idea solves this problem: students cannot find a quiet room? (a) a medicine reminder (b) a study-room finder (c) a homework planner (d) a bill splitter
  14. 14.🧪 What is the actual result of a test? (a) what the app really does (b) the test’s number (c) what we hope for (d) the app’s name
  15. 15.✏️ Why draw a wireframe before coding? (a) it saves data (b) changes are quick (c) it adds colours (d) it runs the app
  16. 16.👆 Two designs for the same task (each arrow is one tap). How many taps does Design A need?
    Design A: Home → Results → Pens → Size → Confirm → Offers
    Design B: Home → Results → Cart
  17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 58; // 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 4 (b) line 3 (c) line 1 (d) line 2
  18. 18.🔁 What does a loop do? (a) draws icons (b) deletes code (c) saves photos (d) repeats code
  19. 19.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Menu: 22 px
    Caption: 21 px
    Footer: 27 px
    Title: 11 px
    Body text: 16 px     (a) Title (b) Caption (c) Footer (d) Menu
  20. 20.💾 Which can hold many values in order? (a) a single number (b) a button (c) a list (d) a switch
  21. 21.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ menu icon ]
    [ top bar ]
    [ tab bar ]
    [ title text ]
    [ list of items ]
    [ search box ]     (a) top bar (b) list of items (c) search box (d) tab bar
  22. 22.📊 Survey: which problem bugs you most? How many students voted in all?
    wasting pocket money: 11 votes
    losing water bottles: 3 votes
    no quiet study place: 21 votes
  23. 23.True or false: an app that just says hi solves no real problem. (a) False (b) True
  24. 24.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 60 px tall
    Back button: 28 px tall
    Send button: 68 px tall     (a) Send (b) Back (c) Done
  25. 25.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Quiz tab
    2. tap the Lessons tab
    3. open “Help page”
    4. open “Match report”
    5. open “Video”
    How many times must you tap Back to reach the main screen of this tab?
  26. 26.🌐 Which program do you need to open a website? (a) a camera app (b) a calculator (c) an app store (d) a web browser
  27. 27.🔀 What does this battery rule show?
    let battery = 79;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    }     (a) Battery OK (b) Low battery
  28. 28.True or false: you sketch the screens at the build stage. (a) True (b) False
  29. 29.🔁 What number does this code show?
    let marks = [6, 16, 13];
    let total = 0;
    for (let i = 0; i < marks.length; i++) {
      total = total + marks[i];
    }
    show(total);
  30. 30.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Caption: 17 px
    Title: 24 px
    Body text: 28 px
    Hint: 22 px
    Label: 14 px     (a) Title (b) Label (c) Caption (d) Body text
  31. 31.🔐 Is this permission request fair or too much: calculator → location? (a) fair (b) too much
  32. 32.🧭 Which part of navigation switches main sections? (a) a menu button (b) a tab bar (c) the back button
  33. 33.🚀 Which version is newer: 1.13.3 or 1.8.3? (a) 1.8.3 (b) 1.13.3
  34. 34.⚙️ What number does this app show?
    let price = 230; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  35. 35.True or false: a water reminder is the best fit for a runner who forgets to sip water. (a) False (b) True
  36. 36.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ list of items ]
    [ menu icon ]
    [ search box ]
    [ tab bar ]     (a) list of items (b) tab bar (c) search box (d) menu icon
  37. 37.🧩 In an app, what is your saved notes? (a) an input (b) a button (c) a screen (d) data
  38. 38.👥 A library app has 135 readers, 125 librarians and 140 volunteers as users. How many more volunteers than librarians are there?
  39. 39.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Score card”
    2. tap Back
    3. open “Score card”
    4. tap Back
    Which screen are you on now?     (a) Profile (b) Home (c) Search (d) Score card
  40. 40.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let points = 45; // start at 45
    line 2: points = points + 6; // add 6
    line 3: points = points * 3; // double it
    line 4: show(points); // show it     (a) line 1 (b) line 2 (c) line 3

Answer key

  1. Welcome, Zoya!
  2. see tasks by day
  3. pick one of two actions
  4. Well done, Aman!
  5. expected result
  6. False
  7. 0, 1, 2
  8. Battery OK
  9. see the final score
  10. 4
  11. share tasks to friends
  12. 0
  13. a study-room finder
  14. what the app really does
  15. changes are quick
  16. 5
  17. line 3
  18. repeats code
  19. Title
  20. a list
  21. search box
  22. 35
  23. True
  24. Back
  25. 3
  26. a web browser
  27. Battery OK
  28. False
  29. 35
  30. Label
  31. too much
  32. a tab bar
  33. 1.13.3
  34. 210
  35. True
  36. tab bar
  37. data
  38. 15
  39. Home
  40. line 3

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