App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 858 · 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 app idea solves this problem: the library is always full? (a) a lost-and-found board (b) a homework planner (c) a study-room finder (d) a bill splitter
2. 2.🔀 What does this battery rule show?
   let battery = 6;
   if (battery < 20) {
     show("Low battery");
   } else {
     show("Battery OK");
   } (a) Battery OK (b) Low battery
3. 3.True or false: tapping a button is an input. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) write the store text (b) list what users need (c) put it on an app store (d) share the download link
5. 5.True or false: you talk to possible users at the idea stage. (a) True (b) False
6. 6.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
   1. open “Friend list”
   2. tap Back
   3. tap the Home tab
   4. open “Badges”
   5. tap Back
   Which screen are you on now? (a) Home (b) Badges (c) Friend list (d) Search
7. 7.🧪 What is the ACTUAL result of Test 3?
   🚚 Rule: delivery is free (0) when the order is 400 or more; otherwise it costs 40.
   function delivery(total) {
     if (total >= 400) {
       return 0;
     }
     return 40;
   }
   Test 1: delivery(750) → expected 0
   Test 2: delivery(600) → expected 0
   Test 3: delivery(250) → expected 40
8. 8.⚙️ What number does this app show?
   let price = 85; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
9. 9.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let stars = 30; // start at 30
   line 2: stars = stars + 6; // add 6
   line 3: stars = stars - 1; // take away 1
   line 4: stars = stars + 2; // double it
   line 5: show(stars); // show it (a) line 2 (b) line 4 (c) line 3 (d) line 1
10. 10.♿ Does this help everyone, or make the app harder to use: colour as the only clue? (a) helps everyone (b) makes it harder
11. 11.🚀 In version 2.5.1, which number is the major version? (a) 251 (b) 5 (c) 2 (d) 1
12. 12.🧩 How many buttons does this app screen have?
    [title] New Note
    [button] Next
    [button] Help
    [switch] Dark mode
    [button] Back
    [text box] Age
    [slider] Volume
13. 13.Which of these requests asks for too much? (a) calculator → location (b) calling app → contacts (c) map app → location (d) voice notes → microphone
14. 14.🧪 One test case fails. Which one?
    🚚 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(800) → expected 0
    Test 2: delivery(400) → expected 40
    Test 3: delivery(500) → expected 0 (a) Test 2 (b) Test 1 (c) Test 3
15. 15.💾 pop() takes off the last item. What does this code show?
    let notes = ["Maths", "Sports", "Music", "Science", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Music (b) Maths (c) Science (d) Sports
16. 16.True or false: how fast a task is done is about UI (the look). (a) True (b) False
17. 17.🔢 In a sign-up flow, which comes first: “tap “Sign up”” or “type name and email”? (a) tap “Sign up” (b) type name and email
18. 18.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. tap the Profile tab
    2. open “Video”
    3. open “Badges”
    Which screen are you on now? (a) Home (b) Video (c) Search (d) Badges
19. 19.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(35, 3));
20. 20.💾 What number does this code show?
    let points = 4;
    points = points - 2;
    points = points + 5;
    show(points);
21. 21.True or false: tap to go Next is a button. (a) False (b) True
22. 22.🔀 In this course’s code, which sign tests “is equal to”? (a) = (b) === (c) !== (d) =>
23. 23.🧪 How many of these test cases pass?
    🎟️ 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(7) → expected 50
    Test 2: price(13) → expected 100
    Test 3: price(14) → expected 100
24. 24.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 0, 1, 2, 3 (b) 1, 2, 3 (c) 3 (d) 0, 1, 2
25. 25.🗒️ A to-do app with no “add a task” feature is ___. (a) well planned (b) ready to release (c) missing a must-have (d) a nice extra
26. 26.🔀 What does this PIN rule show?
    let pin = "58642";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
27. 27.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let points = 35; // start at 35
    line 2: points = points - 3; // take away 3
    line 3: points = points - 4; // add 4
    line 4: points = points * 2; // double it
    line 5: show(points); // show it
28. 28.💡 Which is a problem statement? (a) “Add a logo” (b) “Use blue buttons” (c) “Make it fast” (d) “Kids forget homework”
29. 29.💡 Does an app idea like a blank grey screen solve a real problem? (a) No (b) Yes
30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 52 px tall
    Back button: 40 px tall
    Next button: 60 px tall
    Done button: 36 px tall
31. 31.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let points = 47; // start at 45
    line 2: points = points + 3; // add 3
    line 3: points = points * 2; // double it
    line 4: show(points); // show it
32. 32.🧪 One test case fails. Which one?
    🚚 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(400) → expected 40
    Test 2: delivery(600) → expected 0
    Test 3: delivery(650) → expected 0 (a) Test 2 (b) Test 1 (c) Test 3
33. 33.🔢 When you make an app, which comes first: “build the app” or “test the app”? (a) build the app (b) test the app
34. 34.🧰 What is a function? (a) a screen size (b) a list of colours (c) a type of phone (d) a named block of code
35. 35.🗒️ Why keep version 1 small? (a) to use up storage (b) to look bigger (c) to learn from users soon (d) to confuse users
36. 36.🗒️ You are planning version 1 of a quiz app. Which feature is a MUST-HAVE? (a) confetti effects (b) an avatar shop (c) background music (d) show a question
37. 37.🧰 What does this code show?
    function greet(name) {
      return "Hi, " + name + "!";
    }
    show(greet("Riya")); (a) Hi, name! (b) greet (c) Riya (d) Hi, Riya!
38. 38.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
39. 39.🧭 Which part of navigation undoes one move? (a) the back button (b) a menu button (c) a tab bar
40. 40.💾 What does this code show? (Positions start at 0.)
    let songs = ["Stars", "Ocean", "Sunrise"];
    show(songs[2]); (a) Sunrise (b) Stars (c) Ocean

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