App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 374 · 40 questions

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.

1. 1.📱 Which one is installed on a phone: an app or a website? (a) a website (b) an app
2. 2.🔁 What number does this code show?
   let steps = [20, 18, 6, 9, 12];
   let best = 0;
   for (let i = 0; i < steps.length; i++) {
     if (steps[i] > best) {
       best = steps[i];
     }
   }
   show(best);
3. 3.🧩 In an app, what is the log-in page? (a) a screen (b) an input (c) data (d) a button
4. 4.💡 Does an app idea like a blank grey screen solve a real problem? (a) No (b) Yes
5. 5.🔐 Which permission does a homework photo scanner really need? (a) the microphone (b) location (c) contacts (d) the camera
6. 6.🗂️ What kind of app is a flashcard trainer? (a) a tool app (b) a health app (c) a learning app (d) a game
7. 7.🐞 This code has a bug. What number does it ACTUALLY show?
   line 1: let score = 40; // start at 40
   line 2: score = score * 2; // double it
   line 3: score = score + 4; // add 4
   line 4: score = score * 3; // double it
   line 5: show(score); // show it
8. 8.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
9. 9.🔢 In a sign-up flow, what comes right after “open the app”? (a) type name and email (b) enter the code sent (c) see the home screen (d) tap “Sign up”
10. 10.🎨 UI stands for user ___. (a) interface (b) internet (c) idea (d) input
11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 32 px tall
    Send button: 48 px tall
    Next button: 56 px tall
    Back button: 68 px tall (a) Next (b) Back (c) Cancel (d) Send
12. 12.🔁 What number does this code show?
    let runs = [2, 11, 16, 18];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
13. 13.🔁 list.length tells you ___. (a) the biggest item (b) the first item (c) the last item (d) how many items it has
14. 14.🔁 What is the LAST line this code shows?
    let names = ["Arjun", "Zoya", "Meera", "Riya"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Zoya (b) Hi, Meera (c) Hi, Arjun (d) Hi, Riya
15. 15.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) export to a file (b) pie-chart colours (c) show the balance (d) savings stickers
16. 16.True or false: a flashcard trainer is a tool app. (a) True (b) False
17. 17.Which of these is an input? (a) the settings page (b) tap to Start (c) the game-over page (d) a slider for volume
18. 18.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 42; // start at 42
    line 2: score = score - 5; // add 5
    line 3: score = score * 2; // double it
    line 4: score = score + 6; // add 6
    line 5: show(score); // show it
19. 19.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 32; // start at 32
    line 2: score = score + 5; // add 5
    line 3: score = score - 6; // add 6
    line 4: show(score); // show it
20. 20.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
21. 21.👥 A cricket club app has 150 players, 25 coaches and 85 fans as users. How many more players than fans are there?
22. 22.💡 Which is a problem statement? (a) “Make it fast” (b) “Use blue buttons” (c) “Kids forget homework” (d) “Add a logo”
23. 23.Which of these helps everyone use the app? (a) colour as the only clue (b) fast-flashing lights (c) big touch targets (d) icons with no labels
24. 24.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let score = 32; // start at 31
    line 2: score = score + 2; // add 2
    line 3: score = score - 1; // take away 1
    line 4: score = score + 5; // add 5
    line 5: show(score); // show it
25. 25.♿ Does this help everyone, or make the app harder to use: sudden loud sounds? (a) helps everyone (b) makes it harder
26. 26.Which of these is about UX (the experience)? (a) the font size (b) the button colours (c) how many taps it takes (d) the theme colours
27. 27.True or false: you put it on an app store at the release stage. (a) False (b) True
28. 28.🔢 In a photo-post flow, which comes LAST? (a) take the photo (b) open the camera screen (c) post the photo (d) add a filter
29. 29.🔍 Which is the odd one out? (a) how users feel after (b) the font size (c) how many taps it takes (d) whether users get lost
30. 30.👆 The user taps the button 3 times. What number does the label show now?
    let points = 9;
    button.onTap = function () {
      points = points + 1;
      label.text = points;
    };
31. 31.🔍 Which is the odd one out? (a) captions on videos (b) labels on every icon (c) icons with no labels (d) strong colour contrast
32. 32.✏️ Is this true of a wireframe or of a final design: shows the real fonts? (a) a final design (b) a wireframe
33. 33.🔀 A screen with no way forward or back is called a ___. (a) shortcut (b) tab bar (c) dead end (d) home screen
34. 34.⚙️ What number does this app show?
    let bill = 102; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
35. 35.True or false: a page of random dots solves a real problem. (a) False (b) True
36. 36.📱 Which one comes from an app store: an app or a website? (a) an app (b) a website
37. 37.True or false: how users feel after is about UX (the experience). (a) True (b) False
38. 38.🧰 What is a function? (a) a named block of code (b) a type of phone (c) a list of colours (d) a screen size
39. 39.True or false: you add the buttons at the build stage. (a) False (b) True
40. 40.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Footer: 22 px
    Title: 15 px
    Menu: 24 px

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