App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 98 · 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.🧪 What is the ACTUAL result of Test 1?
   🎟️ Rule: a ticket costs 50 for children under 8, and 100 for everyone else.
   function price(age) {
     if (age < 8) {
       return 50;
     }
     return 100;
   }
   Test 1: price(14) → expected 100
   Test 2: price(11) → expected 100
   Test 3: price(7) → expected 50
2. 2.True or false: a final design looks like the real app. (a) True (b) False
3. 3.👥 A school app has 80 students, 30 teachers and 95 parents as users. How many more students than teachers are there?
4. 4.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let coins = 36; // start at 36
   line 2: coins = coins * 2; // double it
   line 3: coins = coins - 2; // take away 2
   line 4: coins = coins * 3; // double it
   line 5: show(coins); // show it
5. 5.🔀 What does this PIN rule show?
   let pin = "78824";
   if (pin.length === 4) {
     show("PIN saved");
   } else {
     show("Use 4 digits");
   } (a) Use 4 digits (b) PIN saved
6. 6.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
7. 7.🧭 Which part of navigation shows 3 to 5 icons? (a) a tab bar (b) a menu button (c) the back button
8. 8.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let coins = 47; // start at 45
   line 2: coins = coins + 3; // add 3
   line 3: coins = coins + 4; // add 4
   line 4: coins = coins - 1; // take away 1
   line 5: show(coins); // show it (a) line 4 (b) line 2 (c) line 1 (d) line 3
9. 9.🔁 What is the LAST line this code shows?
   let names = ["Meera", "Arjun", "Riya", "Kabir"];
   for (let i = 0; i < names.length; i++) {
     show("Hi, " + names[i]);
   } (a) Hi, Riya (b) Hi, Kabir (c) Hi, Meera (d) Hi, Arjun
10. 10.🔁 What is the LAST line this code shows?
    let names = ["Aman", "Meera", "Arjun"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Meera (b) Hi, Aman (c) Hi, Arjun
11. 11.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) on the phone (b) in the cloud
12. 12.🔢 In a photo-post flow, which comes first: “write a caption” or “open the camera screen”? (a) write a caption (b) open the camera screen
13. 13.🧪 How many of these test cases pass?
    🚚 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(1100) → expected 0
    Test 2: delivery(600) → expected 40
    Test 3: delivery(1200) → expected 0
14. 14.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 39; // start at 37
    line 2: score = score + 3; // add 3
    line 3: score = score - 1; // take away 1
    line 4: score = score + 3; // add 3
    line 5: show(score); // show it
15. 15.True or false: a step counter is a health app. (a) False (b) True
16. 16.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. tap the Home tab
    2. open “Edit photo”
    3. open “Edit photo”
    4. tap the Profile tab
    Which screen are you on now? (a) Home (b) Profile (c) Search (d) Edit photo
17. 17.🧪 What is the ACTUAL result of Test 2?
    🎟️ Rule: a ticket costs 50 for children under 9, and 100 for everyone else.
    function price(age) {
      if (age <= 9) {
        return 50;
      }
      return 100;
    }
    Test 1: price(14) → expected 100
    Test 2: price(12) → expected 100
    Test 3: price(5) → expected 50
18. 18.🔍 Which is the odd one out? (a) a beep sound (b) a pop-up message (c) adding up a bill (d) a result on screen
19. 19.🔁 What number does this code show?
    let scores = [15, 13, 4, 7, 9];
    let best = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] > best) {
        best = scores[i];
      }
    }
    show(best);
20. 20.🎨 Who should you test the UX with? (a) real users (b) only yourself (c) the app icon (d) nobody
21. 21.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 1 (c) line 2
22. 22.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. tap the Feed tab
    2. open “Help page”
    3. tap Back
    Which screen are you on now? (a) Help page (b) Chat (c) Settings (d) Feed
23. 23.🔢 When you make an app, which comes first: “build the app” or “plan the screens”? (a) plan the screens (b) build the app
24. 24.👆 The user taps the button 2 times. What number does the label show now?
    let stars = 2;
    button.onTap = function () {
      stars = stars + 5;
      label.text = stars;
    };
25. 25.Which of these is a user need? (a) a reminder alarm (b) a dark mode switch (c) “I forget my homework” (d) a share button
26. 26.True or false: tap to Save is a button. (a) True (b) False
27. 27.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) show the balance (b) export to a file (c) pie-chart colours (d) savings stickers
28. 28.Which of these is true of an app? (a) needs no installing (b) has a web address (c) comes from an app store (d) opens from a link
29. 29.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Body text: 27 px
    Title: 25 px
    Menu: 28 px
    Hint: 17 px
    Label: 11 px (a) Menu (b) Body text (c) Label (d) Title
30. 30.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Size → Search → Address
    Design B: Home → Results → Pay → Pens → Item → Confirm → Offers (a) Design A (b) Design B
31. 31.🔢 In a quiz-app flow, what comes right after “see if it is right”? (a) tap “Start quiz” (b) pick an answer (c) see the final score (d) read a question
32. 32.🗒️ Version 1 of a pocket-money tracker must be ready in 14 days. How many days are left for extras after the must-haves?
    add money received: 4 days
    add money spent: 2 days
    show the balance: 3 days
33. 33.📊 Survey: which problem bugs you most? How many students voted in all?
    wasting pocket money: 15 votes
    no quiet study place: 10 votes
    missing the bus: 6 votes
34. 34.📱 Which one needs no installing: an app or a website? (a) a website (b) an app
35. 35.✏️ What is the easiest way to draw a first wireframe? (a) pencil and paper (b) a microphone (c) a 3D printer (d) a phone case
36. 36.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
37. 37.🎨 Fewer taps to finish a task usually means ___. (a) more colours (b) better UX (c) a bigger app (d) worse UX
38. 38.💾 What number does this code show?
    let notes = ["Maths", "Sports"];
    notes.push("Art");
    notes.push("Hindi");
    show(notes.length);
39. 39.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(2) + points(1));
40. 40.True or false: a box to type a name is a screen. (a) True (b) False

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