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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 797 · 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 is the LAST line this code shows?
    let names = ["Aman", "Arjun", "Meera", "Kabir"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    }     (a) Hi, Kabir (b) Hi, Meera (c) Hi, Aman (d) Hi, Arjun
  2. 2.📊 Survey: which problem bugs you most? How many more votes did “forgetting homework” get than “forgetting birthdays”?
    losing water bottles: 11 votes
    forgetting homework: 7 votes
    forgetting birthdays: 6 votes
  3. 3.🔢 When you make an app, which comes LAST? (a) build the app (b) test the app (c) release it (d) plan the screens
  4. 4.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 12, and 100 for everyone else.
    function price(age) {
      if (age <= 12) {
        return 50;
      }
      return 100;
    }
    Test 1: price(12) → expected 100
    Test 2: price(18) → expected 100
    Test 3: price(9) → expected 50     (a) Test 2 (b) Test 1 (c) Test 3
  5. 5.🔀 What number does this shop app show?
    let total = 610;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
  6. 6.👥 A school app has 195 students, 85 teachers and 255 parents as users. How many more students than teachers are there?
  7. 7.🧪 Values right at a limit, like age 12 for “under 12”, are called ___. (a) easy cases (b) phone cases (c) edge cases (d) old cases
  8. 8.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 36; // start at 33
    line 2: stars = stars - 3; // take away 3
    line 3: stars = stars + 5; // add 5
    line 4: stars = stars * 2; // double it
    line 5: show(stars); // show it
  9. 9.🎯 Which app would help this user most: a student who often misses the school bus? (a) a homework planner (b) a bus tracker (c) a water reminder (d) a recipe finder
  10. 10.👆 The user taps the button 2 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) OFF (b) ON
  11. 11.True or false: you let friends try it at the plan stage. (a) False (b) True
  12. 12.👆 The user taps the button 1 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 3) {
        likes = likes + 1;
      }
      label.text = likes;
    };
  13. 13.📊 Survey: which problem bugs you most? How many more votes did “forgetting homework” get than “wasting pocket money”?
    losing water bottles: 14 votes
    wasting pocket money: 13 votes
    forgetting homework: 17 votes
  14. 14.🗒️ The first small, working version of an app is often called an ___. (a) MVP (b) FAQ (c) URL (d) CPU
  15. 15.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
  16. 16.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 40 px tall
    Start button: 44 px tall
    Cancel button: 32 px tall
  17. 17.True or false: your high score is an input. (a) False (b) True
  18. 18.🔢 In a food-order flow, which comes first: “check the cart” or “add it to the cart”? (a) check the cart (b) add it to the cart
  19. 19.🚀 Which version is newer: 4.17.2 or 4.9.2? (a) 4.9.2 (b) 4.17.2
  20. 20.🧰 In function tip(bill), what is bill? (a) a loop (b) an event (c) a screen (d) a parameter
  21. 21.🧰 How do you run (call) a function called greet? (a) greet[] (b) greet() (c) #greet (d) run greet
  22. 22.Which of these is true of a tab bar? (a) opens a list of pages (b) goes to the last screen (c) undoes one move (d) shows 3 to 5 icons
  23. 23.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let score = 49; // start at 47
    line 2: score = score - 5; // take away 5
    line 3: score = score - 3; // take away 3
    line 4: show(score); // show it
  24. 24.🔢 In a quiz-app flow, what comes right after “pick an answer”? (a) tap “Start quiz” (b) see if it is right (c) read a question (d) see the final score
  25. 25.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 11, and 100 for everyone else.
    function price(age) {
      if (age < 11) {
        return 50;
      }
      return 100;
    }
    Test 1: price(17) → expected 100
    Test 2: price(11) → expected 100
    Test 3: price(9) → expected 50
  26. 26.🔀 What does this PIN rule show?
    let pin = "556";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) PIN saved (b) Use 4 digits
  27. 27.True or false: grey text on grey is poor button design. (a) True (b) False
  28. 28.🚀 A privacy policy tells users ___. (a) the app’s price (b) the app’s colours (c) what data is collected (d) the screen size
  29. 29.🧩 How many buttons does this app screen have?
    [title] Add Homework
    [text box] Email
    [button] Next
    [button] Back
    [text box] Phone
    [button] Save
  30. 30.🚀 Which of these versions is the NEWEST?
    1.13.1, 1.15.1, 0.28.2, 1.10.3     (a) 1.10.3 (b) 1.15.1 (c) 0.28.2 (d) 1.13.1
  31. 31.True or false: a wireframe is a quick sketch. (a) True (b) False
  32. 32.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    missing the bus: 25 votes
    no quiet study place: 22 votes
    wasting pocket money: 11 votes     (a) wasting pocket money (b) no quiet study place (c) missing the bus
  33. 33.⚙️ What number does this app show?
    let price = 250; // typed by the user
    let off = 20; // typed by the user
    let pay = price - off;
    show(pay);
  34. 34.🔀 Which badge does this quiz app show?
    let marks = 28;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Bronze (b) Silver (c) Gold
  35. 35.🖼️ How many parts (boxes) does this wireframe have?
    [ search box ]
    [ big picture ]
    [ Save button ]
    [ tab bar ]
    [ filter buttons ]
    [ Add button ]
  36. 36.True or false: a shared to-do list fits saving on the phone. (a) True (b) False
  37. 37.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let points = 32; // start at 31
    line 2: points = points - 4; // take away 4
    line 3: points = points + 3; // add 3
    line 4: show(points); // show it
  38. 38.🧩 Which of these is a button on this screen?
    [title] Edit Profile
    [text box] Name
    [slider] Volume
    [button] Send
    [button] Next
    [button] Done
    [text box] Notes     (a) Volume (b) Name (c) Notes (d) Done
  39. 39.🚀 What should an app ask for only when it really needs it? (a) a font (b) its name (c) a permission (d) its icon
  40. 40.🔐 Which permission does a birthday list of friends really need? (a) location (b) the microphone (c) the camera (d) contacts

Answer key

  1. Hi, Kabir
  2. 1
  3. release it
  4. Test 1
  5. 560
  6. 110
  7. edge cases
  8. 76
  9. a bus tracker
  10. OFF
  11. False
  12. 1
  13. 4
  14. MVP
  15. on the phone
  16. 0
  17. False
  18. add it to the cart
  19. 4.17.2
  20. a parameter
  21. greet()
  22. shows 3 to 5 icons
  23. 39
  24. see if it is right
  25. 3
  26. Use 4 digits
  27. True
  28. what data is collected
  29. 3
  30. 1.15.1
  31. True
  32. missing the bus
  33. 230
  34. Bronze
  35. 6
  36. False
  37. 31
  38. Done
  39. a permission
  40. contacts

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