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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 665 · 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.👥 A clinic app has 265 patients, 215 doctors and 55 nurses as users. Which user group is the biggest? (a) doctors (b) nurses (c) patients
  2. 2.🔍 Which is the odd one out? (a) a step counter (b) a sleep tracker (c) a water reminder (d) an alarm clock
  3. 3.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(80, 5));
  4. 4.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Me tab
    2. open “Help page”
    3. open “Friend list”
    Which screen are you on now?     (a) Lessons (b) Help page (c) Quiz (d) Friend list
  5. 5.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(9));
  6. 6.👥 A clinic app has 295 patients, 150 doctors and 235 nurses as users. How many users does it have in all?
  7. 7.🧪 What is the ACTUAL result of Test 1?
    🚚 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(600) → expected 40
    Test 2: delivery(900) → expected 0
    Test 3: delivery(750) → expected 0
  8. 8.🧪 One test case fails. Which one?
    🚚 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(600) → expected 0
    Test 2: delivery(100) → expected 40
    Test 3: delivery(300) → expected 0     (a) Test 2 (b) Test 3 (c) Test 1
  9. 9.True or false: a library due-date alert solves no real problem. (a) True (b) False
  10. 10.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(3) + points(0));
  11. 11.True or false: a homework planner is the best fit for a teen learning to make snacks. (a) True (b) False
  12. 12.True or false: a class leaderboard fits saving on the phone. (a) False (b) True
  13. 13.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 40; // start at 40
    line 2: stars = stars * 2; // double it
    line 3: stars = stars * 2; // double it
    line 4: stars = stars * 3; // double it
    line 5: show(stars); // show it
  14. 14.🔀 In a good flow, each screen should lead to ___. (a) the same screen (b) a clear next step (c) a dead end (d) a random page
  15. 15.🧪 What is the actual result of a test? (a) what we hope for (b) the app’s name (c) the test’s number (d) what the app really does
  16. 16.💡 How can you check that people really have the problem? (a) copy another app (b) ask possible users (c) pick a colour (d) just guess
  17. 17.🗒️ Version 1 of a water reminder must be ready in 12 days. How many days are left for extras after the must-haves?
    set a reminder time: 4 days
    log a glass of water: 3 days
    see today’s total: 4 days
  18. 18.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Pens → Size → Item
    Design B: Home → Item → Confirm → Shop → Results
  19. 19.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) see tasks by day (b) pick a theme colour (c) set a due date (d) add a homework task
  20. 20.🚀 Which of these versions is the NEWEST?
    4.11.3, 3.21.2, 4.8.9, 4.4.5     (a) 3.21.2 (b) 4.4.5 (c) 4.11.3 (d) 4.8.9
  21. 21.🧰 What does this code show?
    function greet(name) {
      return "Well done, " + name + "!";
    }
    show(greet("Meera"));     (a) Well done, Meera! (b) Well done, name! (c) greet (d) Meera
  22. 22.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let score = 33; // start at 33
    line 2: score = score - 2; // add 2
    line 3: score = score * 2; // double it
    line 4: show(score); // show it     (a) line 3 (b) line 1 (c) line 2
  23. 23.True or false: a big, easy tap area is good button design. (a) False (b) True
  24. 24.📱 Which one has a web address: an app or a website? (a) a website (b) an app
  25. 25.🧪 A test fails when ___. (a) both are the same (b) the app is new (c) actual is not expected (d) the font is big
  26. 26.Which of these is a screen? (a) tap to Send (b) a date picker (c) tap to Start (d) the home page of an app
  27. 27.Which of these is true of a menu button? (a) shows 3 to 5 icons (b) hides extra links (c) switches main sections (d) sits at the bottom
  28. 28.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) add money spent (b) export to a file (c) pie-chart colours (d) savings stickers
  29. 29.👆 Code that runs when an event happens is called a ___. (a) header (b) hashtag (c) handler (d) headline
  30. 30.True or false: grey text on grey is poor button design. (a) True (b) False
  31. 31.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 500 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 500) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(650) → expected 0
    Test 2: delivery(350) → expected 40
    Test 3: delivery(600) → expected 0
  32. 32.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Edit photo”
    2. tap Back
    3. tap the Settings tab
    Which screen are you on now?     (a) Feed (b) Edit photo (c) Settings (d) Chat
  33. 33.Which of these is true of a final design? (a) is a quick sketch (b) looks like the real app (c) uses plain grey boxes (d) shows where things go
  34. 34.♿ Does this help everyone, or make the app harder to use: text that can grow? (a) makes it harder (b) helps everyone
  35. 35.🧩 What do we call one full page of an app? (a) a battery (b) a cable (c) a variable (d) a screen
  36. 36.🔢 In a quiz-app flow, which comes LAST? (a) read a question (b) see the final score (c) tap “Start quiz” (d) see if it is right
  37. 37.🔁 A loop over a list of 5 items runs its body how many times? (a) 6 (b) 1 (c) 5 (d) 4
  38. 38.🔁 Why use a loop to show 100 messages? (a) it uses more lines (b) it hides them (c) less code to write (d) it is slower
  39. 39.🔁 What number does this code show?
    let scores = [81, 69, 66, 34, 66];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 70) {
        count = count + 1;
      }
    }
    show(count);
  40. 40.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 47; // start at 47
    line 2: lives = lives * 3; // double it
    line 3: lives = lives * 2; // double it
    line 4: show(lives); // show it

Answer key

  1. patients
  2. an alarm clock
  3. 400
  4. Friend list
  5. 18
  6. 680
  7. 40
  8. Test 3
  9. False
  10. 40
  11. False
  12. False
  13. 320
  14. a clear next step
  15. what the app really does
  16. ask possible users
  17. 1
  18. 1
  19. pick a theme colour
  20. 4.11.3
  21. Well done, Meera!
  22. line 2
  23. True
  24. a website
  25. actual is not expected
  26. the home page of an app
  27. hides extra links
  28. add money spent
  29. handler
  30. True
  31. 3
  32. Settings
  33. looks like the real app
  34. helps everyone
  35. a screen
  36. see the final score
  37. 5
  38. less code to write
  39. 1
  40. 188

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