App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 413 · 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.🧪 A test case is an input together with its ___. (a) app icon (b) screen colour (c) expected result (d) font size
2. 2.🗒️ Version 1 of a quiz app must be ready in 11 days. How many days are left for extras after the must-haves?
   show a question: 2 days
   check the answer: 4 days
   show the score: 5 days
3. 3.👆 The user types Arjun in nameBox and taps the button 1 time. What does the label show?
   button.onTap = function () {
     label.text = "Hello, " + nameBox.text + "!";
   }; (a) Hello, Arjun! (b) Hello! (c) Arjun (d) Hello, nameBox.text!
4. 4.🚀 Which version is newer: 3.3.2 or 3.3.18? (a) 3.3.2 (b) 3.3.18
5. 5.True or false: an app needs no installing. (a) False (b) True
6. 6.🗒️ 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) see where the bus is
7. 7.🧩 In an app, what is the home page of an app? (a) a screen (b) a button (c) data (d) an input
8. 8.🔢 When you make an app, which comes LAST? (a) test the app (b) plan the screens (c) get an idea (d) release it
9. 9.True or false: tap to go Next is a button. (a) False (b) True
10. 10.🔀 What does this sign-up rule show?
    let age = 8;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
11. 11.Which of these is true of an app? (a) comes from an app store (b) has a web address (c) opens in a web browser (d) needs no installing
12. 12.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. tap the Chat tab
    2. open “Video”
    3. tap the Chat tab
    4. tap the Settings tab
    Which screen are you on now? (a) Feed (b) Settings (c) Chat (d) Video
13. 13.👆 The user taps the button 5 times. What number does the label show now?
    let score = 6;
    button.onTap = function () {
      score = score + 1;
      label.text = score;
    };
14. 14.🧰 In function tip(bill), what is bill? (a) a screen (b) an event (c) a parameter (d) a loop
15. 15.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(36));
16. 16.Which of these fits saving in the cloud? (a) a shared to-do list (b) the sound on/off setting (c) notes to read offline (d) a draft you are typing
17. 17.👆 The user taps the button 1 times. What does the label show now?
    let on = false;
    button.onTap = function () {
      on = !on;
      if (on) {
        label.text = "ON";
      } else {
        label.text = "OFF";
      }
    }; (a) ON (b) OFF
18. 18.🔁 What number does this code show?
    let marks = [6, 12, 12, 5];
    let best = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] > best) {
        best = marks[i];
      }
    }
    show(best);
19. 19.True or false: a website is installed on a phone. (a) False (b) True
20. 20.🗒️ You are planning version 1 of a water reminder. Which feature is a MUST-HAVE? (a) custom alert sounds (b) share your streak (c) see today’s total (d) water animations
21. 21.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let points = 38; // start at 38
    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
22. 22.🔢 In a quiz-app flow, which comes LAST? (a) see the final score (b) tap “Start quiz” (c) read a question (d) pick an answer
23. 23.💾 What number does this code show?
    let lives = 7;
    lives = lives - 6;
    lives = lives + 5;
    show(lives);
24. 24.🔢 In a sign-up flow, what comes right after “make a password”? (a) open the app (b) type name and email (c) enter the code sent (d) see the home screen
25. 25.🧪 What is the ACTUAL result of Test 1?
    🎟️ 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(8) → expected 50
    Test 2: price(12) → expected 100
    Test 3: price(9) → expected 100
26. 26.🔢 In a food-order flow, what comes right after “open the menu”? (a) check the cart (b) add it to the cart (c) pick a dish (d) pay for the order
27. 27.🔁 What number does this code show?
    let marks = [37, 63, 42, 34, 80];
    let count = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] >= 70) {
        count = count + 1;
      }
    }
    show(count);
28. 28.Which of these is true of a website? (a) opens from a link (b) updates from the store (c) comes from an app store (d) is installed on a phone
29. 29.🧭 Where is a tab bar usually placed in a phone app? (a) in the middle (b) nowhere (c) at the bottom (d) inside a button
30. 30.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
31. 31.🔍 Which is the odd one out? (a) captions on videos (b) sudden loud sounds (c) colour as the only clue (d) fast-flashing lights
32. 32.🔀 What number does this shop app show?
    let total = 400;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
33. 33.True or false: you pick the features at the plan stage. (a) False (b) True
34. 34.🧪 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(13) → expected 100
    Test 2: price(7) → expected 50
    Test 3: price(8) → expected 100
35. 35.📊 Survey: which problem bugs you most? How many students voted in all?
    missing the bus: 19 votes
    losing water bottles: 18 votes
    forgetting birthdays: 17 votes
36. 36.💡 Which app idea solves this problem: the library is always full? (a) a bill splitter (b) a lost-and-found board (c) a homework planner (d) a study-room finder
37. 37.🔀 What does >= mean? (a) greater than or equal (b) less than (c) not equal (d) smaller or equal
38. 38.🔀 What number does this shop app show?
    let total = 230;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
39. 39.🔁 What number does this code show?
    let scores = [12, 13, 1, 16];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
40. 40.📱 Which one needs no installing: an app or a website? (a) a website (b) an app

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