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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 720 · 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.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let points = 38; // start at 38
    line 2: points = points + 2; // double it
    line 3: points = points - 2; // take away 2
    line 4: show(points); // show it
  2. 2.🧩 How many buttons does this app screen have?
    [title] Add Homework
    [button] Save
    [text box] Name
    [button] Cancel
  3. 3.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let points = 31; // start at 31
    line 2: points = points + 3; // take away 3
    line 3: points = points - 5; // take away 5
    line 4: show(points); // show it     (a) line 3 (b) line 1 (c) line 2
  4. 4.🗂️ What kind of app is a water reminder? (a) a game (b) a tool app (c) a learning app (d) a health app
  5. 5.💡 After a survey, which need should version 1 solve? (a) the most common need (b) the rarest need (c) a random need (d) the newest trend
  6. 6.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Footer: 17 px
    Label: 11 px
    Hint: 17 px
    Caption: 13 px
  7. 7.👆 The user taps the button 5 times. What number does the label show now?
    let coins = 10;
    button.onTap = function () {
      coins = coins + 5;
      label.text = coins;
    };
  8. 8.🧰 What does return do in a function? (a) deletes the app (b) repeats the code (c) closes the screen (d) sends back a value
  9. 9.Which of these is true of a website? (a) has a home-screen icon (b) opens from a link (c) is installed on a phone (d) updates from the store
  10. 10.🔀 When does the else part run? (a) when the test is false (b) always (c) when the test is true (d) never
  11. 11.True or false: “big touch targets” makes the app harder to use. (a) True (b) False
  12. 12.🗒️ Version 1 of a bus tracker must be ready in 8 days. How many days are left for extras after the must-haves?
    see where the bus is: 2 days
    show arrival time: 3 days
    pick your bus stop: 3 days
  13. 13.🔢 In a sign-up flow, which comes first: “open the app” or “see the home screen”? (a) open the app (b) see the home screen
  14. 14.🎯 Is this a user need or a feature: a dark mode switch? (a) a feature (b) a user need
  15. 15.💡 Does an app idea like a blank grey screen solve a real problem? (a) Yes (b) No
  16. 16.🔢 In a sign-up flow, which comes LAST? (a) enter the code sent (b) make a password (c) see the home screen (d) tap “Sign up”
  17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 480; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 4 (b) line 1 (c) line 3 (d) line 2
  18. 18.👥 A library app has 85 readers, 290 librarians and 75 volunteers as users. How many more librarians than volunteers are there?
  19. 19.🔀 What number does this shop app show?
    let total = 280;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
  20. 20.🚀 Your app is at version 1.7.3. The next release adds a new feature. What is its version number? (a) 1.8.3 (b) 2.0.0 (c) 1.8.0 (d) 1.7.4
  21. 21.🖼️ In this wireframe (top to bottom), what is right below the title text?
    [ tab bar ]
    [ big picture ]
    [ title text ]
    [ list of items ]
    [ filter buttons ]     (a) list of items (b) filter buttons (c) big picture (d) tab bar
  22. 22.♿ Does this help everyone, or make the app harder to use: sudden loud sounds? (a) helps everyone (b) makes it harder
  23. 23.🔀 Which badge does this quiz app show?
    let marks = 31;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Bronze (b) Gold (c) Silver
  24. 24.📊 Survey: which problem bugs you most? How many more votes did “wasting pocket money” get than “forgetting homework”?
    wasting pocket money: 15 votes
    no quiet study place: 4 votes
    forgetting homework: 7 votes
  25. 25.🔢 In a food-order flow, what comes right after “pay for the order”? (a) track the order (b) open the menu (c) add it to the cart (d) pick a dish
  26. 26.🎯 Which app would help this user most: a reader who finds small print hard? (a) a big-text reader (b) a pocket-money tracker (c) a water reminder (d) a homework planner
  27. 27.🔢 In a food-order flow, which comes first: “open the menu” or “pick a dish”? (a) pick a dish (b) open the menu
  28. 28.👆 The user taps the button 1 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 2) {
        likes = likes + 1;
      }
      label.text = likes;
    };
  29. 29.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) rate the driver (b) pick your bus stop (c) see where the bus is (d) show arrival time
  30. 30.🔢 When you make an app, what comes right after “test the app”? (a) plan the screens (b) release it (c) get an idea (d) build the app
  31. 31.👥 A cricket club app has 250 players, 95 coaches and 45 fans as users. How many users does it have in all?
  32. 32.🗂️ What kind of app is a cricket run chase? (a) a tool app (b) a health app (c) a learning app (d) a game
  33. 33.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
  34. 34.💡 Does an app idea like an app that just says hi solve a real problem? (a) Yes (b) No
  35. 35.🎯 Which app would help this user most: a teen learning to make snacks? (a) a water reminder (b) a big-text reader (c) a pocket-money tracker (d) a recipe finder
  36. 36.True or false: a bill splitter solves a real problem. (a) True (b) False
  37. 37.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let score = 35; // start at 34
    line 2: score = score + 5; // add 5
    line 3: score = score * 2; // double it
    line 4: score = score + 4; // add 4
    line 5: show(score); // show it
  38. 38.💡 Which app idea solves this problem: nobody knows whose bag it is? (a) a study-room finder (b) a bill splitter (c) a medicine reminder (d) a lost-and-found board
  39. 39.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 24 px tall
    Send button: 68 px tall
    Back button: 56 px tall
    Done button: 48 px tall     (a) Done (b) Send (c) Back (d) Start
  40. 40.🔀 In this course’s code, which sign tests “is equal to”? (a) !== (b) => (c) = (d) ===

Answer key

  1. 38
  2. 2
  3. line 2
  4. a health app
  5. the most common need
  6. 2
  7. 35
  8. sends back a value
  9. opens from a link
  10. when the test is false
  11. False
  12. 0
  13. open the app
  14. a feature
  15. No
  16. see the home screen
  17. line 3
  18. 215
  19. 280
  20. 1.8.0
  21. list of items
  22. makes it harder
  23. Bronze
  24. 8
  25. track the order
  26. a big-text reader
  27. open the menu
  28. 1
  29. rate the driver
  30. release it
  31. 390
  32. a game
  33. processing
  34. No
  35. a recipe finder
  36. True
  37. 82
  38. a lost-and-found board
  39. Start
  40. ===

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