App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 384 · 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: friends argue over who pays? (a) a bill splitter (b) a medicine reminder (c) a homework planner (d) a lost-and-found board
2. 2.🚀 Which version is newer: 4.5.5 or 4.5.19? (a) 4.5.5 (b) 4.5.19
3. 3.🚀 Which of these versions is the OLDEST?
   1.12.5, 0.21.8, 1.15.8, 1.9.8 (a) 1.9.8 (b) 1.12.5 (c) 1.15.8 (d) 0.21.8
4. 4.🚀 Which version is newer: 1.2.4 or 1.2.11? (a) 1.2.4 (b) 1.2.11
5. 5.True or false: typing your age is an input. (a) False (b) True
6. 6.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
   Label: 26 px
   Title: 23 px
   Caption: 14 px (a) Title (b) Caption (c) Label
7. 7.💾 pop() takes off the last item. What does this code show?
   let friends = ["Zoya", "Kabir", "Arjun"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Zoya (b) Kabir (c) Arjun
8. 8.💾 What does this code show? (Positions start at 0.)
   let friends = ["Riya", "Aman", "Kabir", "Arjun"];
   show(friends[1]); (a) Aman (b) Riya (c) Arjun (d) Kabir
9. 9.🔁 What number does this code show?
   let runs = [12, 2, 16];
   let best = 0;
   for (let i = 0; i < runs.length; i++) {
     if (runs[i] > best) {
       best = runs[i];
     }
   }
   show(best);
10. 10.💡 Which app idea solves this problem: a patient misses doses? (a) a lost-and-found board (b) a medicine reminder (c) a study-room finder (d) a bill splitter
11. 11.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(13));
12. 12.🔀 Which badge does this quiz app show?
    let marks = 76;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Gold (b) Silver (c) Bronze
13. 13.Which of these makes the app harder to use? (a) labels on every icon (b) big touch targets (c) icons with no labels (d) captions on videos
14. 14.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 41; // start at 41
    line 2: stars = stars - 3; // take away 1
    line 3: stars = stars - 2; // take away 2
    line 4: stars = stars + 6; // add 6
    line 5: show(stars); // show it (a) line 3 (b) line 4 (c) line 1 (d) line 2
15. 15.🧪 How many of these test cases pass?
    📝 Rule: a quiz is passed with 7 or more right answers.
    function result(right) {
      if (right >= 7) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(7) → expected Pass
    Test 2: result(8) → expected Pass
    Test 3: result(4) → expected Try again
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 80; // typed by the user
    line 2: let friends = 4; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 3 (c) line 4 (d) line 1
17. 17.🧪 One test case fails. Which one?
    🚚 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(900) → expected 0
    Test 2: delivery(800) → expected 0
    Test 3: delivery(700) → expected 40 (a) Test 1 (b) Test 3 (c) Test 2
18. 18.⚙️ What number does this app show?
    let price = 50; // typed by the user
    let qty = 4; // typed by the user
    let total = price * qty;
    show(total);
19. 19.🐞 After fixing a bug you should ___. (a) never test (b) delete the test (c) test it again (d) release at once
20. 20.🧪 What is the ACTUAL result of Test 1?
    🚚 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(600) → expected 0
    Test 2: delivery(700) → expected 0
    Test 3: delivery(400) → expected 40
21. 21.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean", "Stars"];
    songs.push("Kites");
    songs.push("Sunrise");
    show(songs.length);
22. 22.🗒️ A to-do app with no “add a task” feature is ___. (a) a nice extra (b) ready to release (c) well planned (d) missing a must-have
23. 23.⚙️ What number does this app show?
    let price = 80; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
24. 24.True or false: a bus tracker needs your location. (a) True (b) False
25. 25.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Caption: 21 px
    Footer: 11 px
    Title: 23 px
    Label: 22 px
    Menu: 23 px
26. 26.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Item → Pay
    Design B: Home → Menu → Search → Shop (a) Design B (b) Design A
27. 27.🚀 Which version is newer: 4.19.2 or 4.8.1? (a) 4.8.1 (b) 4.19.2
28. 28.🔐 Which permission does a walking map really need? (a) the microphone (b) the camera (c) location (d) contacts
29. 29.🖼️ In this wireframe (top to bottom), what is right below the list of items?
    [ Save button ]
    [ list of items ]
    [ title text ]
    [ big picture ]
    [ Add button ] (a) title text (b) Save button (c) big picture (d) Add button
30. 30.👆 The user taps the button 4 times. What number does the label show now?
    let stars = 8;
    button.onTap = function () {
      stars = stars + 1;
      label.text = stars;
    };
31. 31.True or false: an app opens from a link. (a) True (b) False
32. 32.🗒️ You are planning version 1 of a bus tracker. Which feature is a MUST-HAVE? (a) a dark mode (b) rate the driver (c) change the bus icon (d) pick your bus stop
33. 33.🔍 Which is the odd one out? (a) a word battle (b) a puzzle with levels (c) a racing challenge (d) a spelling coach
34. 34.🔢 When you make an app, what comes right after “get an idea”? (a) release it (b) test the app (c) plan the screens (d) build the app
35. 35.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Kabir", "Riya", "Arjun"];
    show(friends[1]); (a) Zoya (b) Kabir (c) Riya (d) Arjun
36. 36.True or false: a draft you are typing fits saving on the phone. (a) False (b) True
37. 37.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) pick a theme colour (b) share tasks to friends (c) see tasks by day (d) earn stickers
38. 38.🎯 An app for “everyone” with no clear user usually ___. (a) is easy to build (b) helps nobody well (c) wins every prize (d) needs no testing
39. 39.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Stars", "Rain", "Monsoon", "Kites"];
    show(songs[4]); (a) Kites (b) Rain (c) Sunrise (d) Stars
40. 40.Which of these happens at the build stage? (a) talk to possible users (b) list what users need (c) connect the data (d) sketch the screens

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