App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 618 · 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.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
   1. open “Badges”
   2. tap Back
   3. open “Badges”
   4. open “Badges”
   How many times must you tap Back to reach the main screen of this tab?
2. 2.🔢 In a photo-post flow, which comes LAST? (a) take the photo (b) open the camera screen (c) write a caption (d) post the photo
3. 3.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) add a homework task (b) see tasks by day (c) set a due date (d) pick a theme colour
4. 4.🧪 What is the ACTUAL result of Test 1?
   🚚 Rule: delivery is free (0) when the order is 600 or more; otherwise it costs 40.
   function delivery(total) {
     if (total > 600) {
       return 0;
     }
     return 40;
   }
   Test 1: delivery(450) → expected 40
   Test 2: delivery(800) → expected 0
   Test 3: delivery(600) → expected 0
5. 5.📅 An app team plans for 4 days, builds for 5 days, tests for 1 days and releases on 1 more day. How many more days does building take than testing?
6. 6.🗒️ A to-do app with no “add a task” feature is ___. (a) well planned (b) ready to release (c) a nice extra (d) missing a must-have
7. 7.🔢 In a food-order flow, which comes FIRST? (a) pay for the order (b) open the menu (c) check the cart (d) pick a dish
8. 8.🧰 What number does this code show?
   function points(stars) {
     return stars * 10 + 5;
   }
   show(points(2) + points(3));
9. 9.🎨 UX stands for user ___. (a) example (b) express (c) extra (d) experience
10. 10.Which of these is about UI (the look)? (a) the theme colours (b) how users feel after (c) how fast a task is done (d) whether users get lost
11. 11.🔁 What is the LAST line this code shows?
    let names = ["Aman", "Zoya", "Riya", "Meera", "Arjun"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Riya (b) Hi, Zoya (c) Hi, Arjun (d) Hi, Aman
12. 12.📅 An app team plans for 3 days, builds for 10 days, tests for 1 days and releases on 1 more day. How many more days does building take than testing?
13. 13.🧩 How many buttons does this app screen have?
    [title] New Note
    [button] Done
    [button] Help
    [switch] Dark mode
    [button] Start
    [text box] City
    [text box] Phone
14. 14.Which of these is an input? (a) your friends list (b) a date picker (c) tap to Send (d) the settings page
15. 15.🧪 What is the ACTUAL result of Test 2?
    🚚 Rule: delivery is free (0) when the order is 800 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 800) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(600) → expected 40
    Test 2: delivery(1050) → expected 0
    Test 3: delivery(950) → expected 0
16. 16.Which of these happens at the test stage? (a) draw the user flow (b) connect the data (c) sketch the screens (d) try every button
17. 17.📊 Survey: which problem bugs you most? How many more votes did “losing water bottles” get than “forgetting homework”?
    forgetting homework: 4 votes
    no quiet study place: 5 votes
    losing water bottles: 19 votes
18. 18.🔍 Which is the odd one out? (a) try every button (b) let friends try it (c) write the store text (d) write down the bugs
19. 19.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) pie-chart colours (b) savings stickers (c) export to a file (d) add money spent
20. 20.🧩 How many buttons does this app screen have?
    [title] Order Snacks
    [button] Help
    [text box] Age
    [button] Save
    [text box] Phone
    [text box] Name
    [slider] Text size
21. 21.🧭 Why should every screen show where you are? (a) to hide the menu (b) to use more battery (c) to look busy (d) so users do not get lost
22. 22.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let coins = 40; // start at 38
    line 2: coins = coins + 3; // add 3
    line 3: coins = coins + 6; // add 6
    line 4: coins = coins * 2; // double it
    line 5: show(coins); // show it
23. 23.💾 Saving data in the cloud lets you ___. (a) skip the internet (b) shrink the app (c) use it on any device (d) never need a password
24. 24.🔍 Which is the odd one out? (a) icons with no labels (b) labels on every icon (c) fast-flashing lights (d) tiny tap areas
25. 25.True or false: tap to Start is data. (a) True (b) False
26. 26.🎯 A short made-up profile of a typical user is called a ___. (a) protocol (b) password (c) pixel (d) persona
27. 27.🔀 What does this battery rule show?
    let battery = 72;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Battery OK (b) Low battery
28. 28.🔀 What does this sign-up rule show?
    let age = 12;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
29. 29.True or false: “big touch targets” helps everyone use the app. (a) True (b) False
30. 30.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) see tasks by day (b) set a due date (c) add a homework task (d) earn stickers
31. 31.👆 The user taps the button 5 times. What number does the label show now?
    let lives = 1;
    button.onTap = function () {
      lives = lives + 1;
      label.text = lives;
    };
32. 32.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 32; // start at 32
    line 2: lives = lives - 2; // add 2
    line 3: lives = lives + 2; // add 2
    line 4: lives = lives + 2; // add 2
    line 5: show(lives); // show it
33. 33.🔁 What number does this code show?
    let steps = [20, 2, 7, 14, 8];
    let best = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] > best) {
        best = steps[i];
      }
    }
    show(best);
34. 34.🔀 In this course’s code, which sign tests “is equal to”? (a) = (b) !== (c) => (d) ===
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 7; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
36. 36.🔁 What number does this code show?
    let runs = [30, 64, 42];
    let count = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] >= 70) {
        count = count + 1;
      }
    }
    show(count);
37. 37.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let score = 36; // start at 36
    line 2: score = score - 4; // add 4
    line 3: score = score * 2; // double it
    line 4: score = score + 2; // add 2
    line 5: show(score); // show it
38. 38.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 25; // typed by the user
    line 2: let qty = 4; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 1 (c) line 4 (d) line 3
39. 39.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. tap the Chat tab
    2. open “Edit photo”
    3. tap the Feed tab
    4. tap the Chat tab
    5. tap the Feed tab
    Which screen are you on now? (a) Edit photo (b) Chat (c) Feed (d) Settings
40. 40.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 44; // start at 42
    line 2: lives = lives * 2; // double it
    line 3: lives = lives * 2; // double it
    line 4: lives = lives * 2; // double it
    line 5: show(lives); // show it

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