App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 222 · 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 number does this code show?
   let scores = [4, 10, 16, 11];
   let best = 0;
   for (let i = 0; i < scores.length; i++) {
     if (scores[i] > best) {
       best = scores[i];
     }
   }
   show(best);
2. 2.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let lives = 35; // start at 35
   line 2: lives = lives + 5; // add 3
   line 3: lives = lives + 4; // add 4
   line 4: show(lives); // show it (a) line 3 (b) line 1 (c) line 2
3. 3.True or false: the screen layout is about UX (the experience). (a) False (b) True
4. 4.🖼️ In this wireframe (top to bottom), what is right below the Add button?
   [ list of items ]
   [ big picture ]
   [ Add button ]
   [ title text ]
   [ Save button ]
   [ search box ] (a) list of items (b) big picture (c) title text (d) Save button
5. 5.🔁 What number does this code show?
   let steps = [3, 12, 11, 11, 1];
   let total = 0;
   for (let i = 0; i < steps.length; i++) {
     total = total + steps[i];
   }
   show(total);
6. 6.🧰 What is a function? (a) a list of colours (b) a screen size (c) a named block of code (d) a type of phone
7. 7.🔁 What number does this code show?
   let scores = [20, 13, 16];
   let best = 0;
   for (let i = 0; i < scores.length; i++) {
     if (scores[i] > best) {
       best = scores[i];
     }
   }
   show(best);
8. 8.🔁 What is the LAST line this code shows?
   let names = ["Arjun", "Zoya", "Meera", "Kabir"];
   for (let i = 0; i < names.length; i++) {
     show("Hi, " + names[i]);
   } (a) Hi, Arjun (b) Hi, Kabir (c) Hi, Meera (d) Hi, Zoya
9. 9.🔀 What number does this shop app show?
   let total = 310;
   if (total > 500) {
     total = total - 50;
   }
   show(total);
10. 10.Which of these requests is fair? (a) voice notes → microphone (b) calculator → location (c) quiz app → microphone (d) torch → contacts
11. 11.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. tap the Chat tab
    2. open “Friend list”
    3. open “Edit photo”
    4. open “Edit photo”
    Which screen are you on now? (a) Chat (b) Friend list (c) Edit photo (d) Feed
12. 12.Which of these fits saving on the phone? (a) a draft you are typing (b) a class leaderboard (c) chat messages to friends (d) a shared to-do list
13. 13.🔀 What does this sign-up rule show?
    let age = 10;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
14. 14.🧪 What is the actual result of a test? (a) the app’s name (b) the test’s number (c) what we hope for (d) what the app really does
15. 15.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(3) + points(3));
16. 16.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) savings stickers (b) show the balance (c) export to a file (d) pie-chart colours
17. 17.🎨 Who should you test the UX with? (a) the app icon (b) nobody (c) only yourself (d) real users
18. 18.🧪 How many of these test cases pass?
    📝 Rule: a quiz is passed with 5 or more right answers.
    function result(right) {
      if (right > 5) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(4) → expected Try again
    Test 2: result(5) → expected Pass
    Test 3: result(7) → expected Pass
19. 19.🗒️ What is a must-have feature? (a) a sound effect (b) a nice extra (c) one the app cannot skip (d) a colour theme
20. 20.🗒️ You are planning version 1 of a bus tracker. Which feature is a MUST-HAVE? (a) change the bus icon (b) rate the driver (c) a dark mode (d) pick your bus stop
21. 21.🔢 In a food-order flow, which comes first: “track the order” or “check the cart”? (a) check the cart (b) track the order
22. 22.True or false: a medicine reminder solves a real problem. (a) False (b) True
23. 23.👆 The user taps the button 2 times. What number does the label show now?
    let coins = 10;
    button.onTap = function () {
      coins = coins + 1;
      label.text = coins;
    };
24. 24.👆 What kind of event is this: the search box changes? (a) a timer event (b) a tap event (c) a text event (d) a load event
25. 25.🔍 Which is the odd one out? (a) write down the bugs (b) try every button (c) let friends try it (d) talk to possible users
26. 26.🗒️ Version 1 of a quiz app must be ready in 9 days. How many days are left for extras after the must-haves?
    show a question: 4 days
    check the answer: 1 days
    show the score: 3 days
27. 27.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let points = 31; // start at 31
    line 2: points = points + 2; // double it
    line 3: points = points + 2; // add 2
    line 4: points = points * 2; // double it
    line 5: show(points); // show it
28. 28.🐞 A comment in code (after //) is for ___. (a) the phone screen (b) people reading the code (c) the battery (d) the app store
29. 29.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
30. 30.True or false: an app comes from an app store. (a) True (b) False
31. 31.Which of these app ideas solves no real problem? (a) a page of random dots (b) a lost-and-found board (c) a bill splitter (d) a library due-date alert
32. 32.🗂️ What kind of app is a torch? (a) a learning app (b) a health app (c) a tool app (d) a game
33. 33.Which of these fits saving on the phone? (a) photos on two devices (b) chat messages to friends (c) notes to read offline (d) a class leaderboard
34. 34.♿ Why add captions to videos? (a) to add colour (b) to hide the sound (c) so anyone can follow (d) to slow them down
35. 35.🔢 In a sign-up flow, which comes first: “make a password” or “open the app”? (a) make a password (b) open the app
36. 36.🗒️ You are planning version 1 of a bus tracker. Which feature is a MUST-HAVE? (a) rate the driver (b) change the bus icon (c) a dark mode (d) show arrival time
37. 37.Which of these is data? (a) the home page of an app (b) the log-in page (c) the settings page (d) your saved notes
38. 38.🔁 What number does this code show?
    let marks = [11, 14, 3, 1, 3];
    let total = 0;
    for (let i = 0; i < marks.length; i++) {
      total = total + marks[i];
    }
    show(total);
39. 39.True or false: a wireframe shows the real fonts. (a) False (b) True
40. 40.💾 Data saved only on the phone is lost when ___. (a) the phone is lost (b) the app is closed (c) you send a message (d) the screen turns off

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students