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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 223 · 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.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) on the phone (b) in the cloud
  2. 2.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Quiz tab
    2. open “Match report”
    3. tap the Lessons tab
    4. tap the Me tab
    How many times must you tap Back to reach the main screen of this tab?
  3. 3.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 700 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 700) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(850) → expected 0
    Test 2: delivery(650) → expected 40
    Test 3: delivery(950) → expected 0
  4. 4.🔐 Which permission does a homework photo scanner really need? (a) the camera (b) location (c) contacts (d) the microphone
  5. 5.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
  6. 6.🔢 In a quiz-app flow, which comes LAST? (a) see if it is right (b) pick an answer (c) tap “Start quiz” (d) see the final score
  7. 7.💾 Where should the app save the sound on/off setting: on the phone or in the cloud? (a) in the cloud (b) on the phone
  8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 72 px tall
    Save button: 56 px tall
    Next button: 28 px tall     (a) Next (b) Save (c) Help
  9. 9.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 36; // start at 36
    line 2: lives = lives + 2; // double it
    line 3: lives = lives + 2; // add 2
    line 4: show(lives); // show it     (a) line 3 (b) line 1 (c) line 2
  10. 10.🎨 UX stands for user ___. (a) extra (b) express (c) experience (d) example
  11. 11.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let points = 48; // start at 48
    line 2: points = points + 5; // take away 5
    line 3: points = points * 2; // double it
    line 4: show(points); // show it
  12. 12.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 49; // start at 49
    line 2: lives = lives * 2; // double it
    line 3: lives = lives - 6; // add 6
    line 4: show(lives); // show it     (a) line 1 (b) line 2 (c) line 3
  13. 13.🚀 Your app is at version 2.2.5. The next release fixes a small bug. What is its version number? (a) 2.3.0 (b) 3.0.0 (c) 2.3.5 (d) 2.2.6
  14. 14.🔢 When you make an app, what comes right after “plan the screens”? (a) test the app (b) build the app (c) release it (d) get an idea
  15. 15.🗒️ Version 1 of a homework planner must be ready in 18 days. How many days are left for extras after the must-haves?
    add a homework task: 3 days
    set a due date: 4 days
    see tasks by day: 5 days
  16. 16.⚙️ In an app, is speaking a command an input, processing or an output? (a) processing (b) input (c) output
  17. 17.👥 A school app has 60 students, 270 teachers and 150 parents as users. Which user group is the biggest? (a) students (b) parents (c) teachers
  18. 18.👆 The user taps the button 5 times. What number does the label show now?
    let stars = 0;
    button.onTap = function () {
      stars = stars + 1;
      label.text = stars;
    };
  19. 19.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Edit photo”
    2. open “Help page”
    3. tap the Lessons tab
    4. open “Edit photo”
    5. tap Back
    How many times must you tap Back to reach the main screen of this tab?
  20. 20.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Badges”
    2. tap the Chat tab
    3. open “Edit photo”
    4. tap Back
    5. open “Badges”
    How many times must you tap Back to reach the main screen of this tab?
  21. 21.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 36 px tall
    Next button: 40 px tall
    Save button: 52 px tall
    Back button: 52 px tall
  22. 22.👆 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) Arjun (b) Hi, Arjun! (c) Hi! (d) Hi, nameBox.text!
  23. 23.Which of these is true of an app? (a) has a home-screen icon (b) opens from a link (c) opens in a web browser (d) needs no installing
  24. 24.🔢 In a sign-up flow, which comes LAST? (a) make a password (b) type name and email (c) tap “Sign up” (d) see the home screen
  25. 25.True or false: the font size is about UX (the experience). (a) True (b) False
  26. 26.💡 Does an app idea like a blank grey screen solve a real problem? (a) No (b) Yes
  27. 27.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Match report”
    2. tap Back
    3. open “Friend list”
    How many times must you tap Back to reach the main screen of this tab?
  28. 28.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
  29. 29.🔀 Which badge does this quiz app show?
    let marks = 71;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Gold (b) Silver (c) Bronze
  30. 30.True or false: an alarm clock is a game. (a) True (b) False
  31. 31.Which of these is true of a website? (a) comes from an app store (b) has a home-screen icon (c) is installed on a phone (d) needs no installing
  32. 32.📊 Survey: which problem bugs you most? How many more votes did “no quiet study place” get than “losing water bottles”?
    losing water bottles: 10 votes
    wasting pocket money: 22 votes
    no quiet study place: 21 votes
  33. 33.♿ A screen has 5 icon buttons. Only 2 of them have a text label for screen readers. How many still need a label?
  34. 34.👥 A library app has 240 readers, 280 librarians and 120 volunteers as users. How many more readers than volunteers are there?
  35. 35.👆 The user taps the button 6 times. What number does the label show now?
    let lives = 0;
    button.onTap = function () {
      lives = lives + 4;
      label.text = lives;
    };
  36. 36.🔀 With if / else if / else, how many parts run? (a) two (b) none (c) all of them (d) only one
  37. 37.True or false: icons with no meaning is good button design. (a) True (b) False
  38. 38.🖼️ How many parts (boxes) does this wireframe have?
    [ tab bar ]
    [ top bar ]
    [ search box ]
    [ list of items ]
    [ Save button ]
    [ filter buttons ]
  39. 39.🧪 What is the ACTUAL result of Test 3?
    🚚 Rule: delivery is free (0) when the order is 300 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 300) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(200) → expected 40
    Test 2: delivery(600) → expected 0
    Test 3: delivery(750) → expected 0
  40. 40.👆 What kind of event is this: one second passes? (a) a text event (b) a timer event (c) a tap event (d) a load event

Answer key

  1. in the cloud
  2. 0
  3. 3
  4. the camera
  5. poor design
  6. see the final score
  7. on the phone
  8. Next
  9. line 2
  10. experience
  11. 106
  12. line 3
  13. 2.2.6
  14. build the app
  15. 6
  16. input
  17. teachers
  18. 5
  19. 0
  20. 1
  21. 2
  22. Hi, Arjun!
  23. has a home-screen icon
  24. see the home screen
  25. False
  26. No
  27. 1
  28. processing
  29. Silver
  30. False
  31. needs no installing
  32. 11
  33. 3
  34. 120
  35. 24
  36. only one
  37. False
  38. 6
  39. 0
  40. a timer event

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