App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 694 · 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.True or false: a slider for volume is a screen. (a) False (b) True
2. 2.🔁 What number does this code show?
   let steps = [16, 17, 1, 7, 3];
   let best = 0;
   for (let i = 0; i < steps.length; i++) {
     if (steps[i] > best) {
       best = steps[i];
     }
   }
   show(best);
3. 3.🎯 Is this a user need or a feature: a share button? (a) a feature (b) a user need
4. 4.🔀 What does this PIN rule show?
   let pin = "1697";
   if (pin.length === 4) {
     show("PIN saved");
   } else {
     show("Use 4 digits");
   } (a) PIN saved (b) Use 4 digits
5. 5.💾 pop() takes off the last item. What does this code show?
   let friends = ["Riya", "Aman", "Arjun", "Zoya", "Kabir"];
   friends.pop();
   show(friends[friends.length - 1]); (a) Riya (b) Aman (c) Zoya (d) Arjun
6. 6.🔀 When does the else part run? (a) when the test is false (b) always (c) never (d) when the test is true
7. 7.🔍 Which is the odd one out? (a) talk to possible users (b) spot a problem to solve (c) write down the bugs (d) list what users need
8. 8.📊 Survey: which problem bugs you most? Which problem should your app solve first?
   no quiet study place: 8 votes
   forgetting homework: 20 votes
   forgetting birthdays: 11 votes (a) forgetting homework (b) forgetting birthdays (c) no quiet study place
9. 9.👆 Which of these is an event? (a) a list of names (b) the font size (c) the user taps a button (d) the icon colour
10. 10.💾 What is a variable? (a) a named box for a value (b) a phone setting (c) a picture (d) a type of screen
11. 11.🧭 What does the back button usually do? (a) deletes the page (b) goes to the last screen (c) closes all apps (d) opens settings
12. 12.🖼️ How many parts (boxes) does this wireframe have?
    [ menu icon ]
    [ Add button ]
    [ top bar ]
    [ title text ]
    [ Save button ]
13. 13.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 45; // start at 45
    line 2: stars = stars + 5; // add 5
    line 3: stars = stars + 6; // add 3
    line 4: show(stars); // show it (a) line 3 (b) line 1 (c) line 2
14. 14.👆 A tap handler runs how many times if the user taps 4 times? (a) 1 (b) 8 (c) 0 (d) 4
15. 15.👆 An event in an app is ___. (a) an app store (b) something that happens (c) a kind of list (d) a colour theme
16. 16.♿ A screen has 5 icon buttons. Only 2 of them have a text label for screen readers. How many still need a label?
17. 17.🔁 What number does this code show?
    let steps = [12, 7, 6];
    let best = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] > best) {
        best = steps[i];
      }
    }
    show(best);
18. 18.💡 How can you check that people really have the problem? (a) ask possible users (b) pick a colour (c) just guess (d) copy another app
19. 19.♿ A screen has 10 icon buttons. Only 3 of them have a text label for screen readers. How many still need a label?
20. 20.Which colour pair is easy to read? (a) red on green (b) dark blue on white (c) dark blue on black (d) light grey on white
21. 21.👆 The user types Meera in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Welcome, " + nameBox.text + "!";
    }; (a) Meera (b) Welcome! (c) Welcome, Meera! (d) Welcome, nameBox.text!
22. 22.🧭 Which part of navigation switches main sections? (a) a menu button (b) the back button (c) a tab bar
23. 23.💡 Which app idea solves this problem: the library is always full? (a) a bill splitter (b) a lost-and-found board (c) a medicine reminder (d) a study-room finder
24. 24.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) pick a theme colour (b) set a due date (c) add a homework task (d) see tasks by day
25. 25.🔍 Which is the odd one out? (a) list what users need (b) spot a problem to solve (c) add the buttons (d) talk to possible users
26. 26.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ search box ]
    [ list of items ]
    [ Add button ]
    [ big picture ] (a) Add button (b) search box (c) list of items (d) big picture
27. 27.👆 The user taps the button 6 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) OFF (b) ON
28. 28.💾 What number does this code show?
    let songs = ["Monsoon", "Ocean"];
    songs.push("Sunrise");
    show(songs.length);
29. 29.🧪 What is the ACTUAL result of Test 3?
    🎟️ Rule: a ticket costs 50 for children under 11, and 100 for everyone else.
    function price(age) {
      if (age < 11) {
        return 50;
      }
      return 100;
    }
    Test 1: price(16) → expected 100
    Test 2: price(14) → expected 100
    Test 3: price(9) → expected 50
30. 30.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let score = 37; // start at 34
    line 2: score = score + 4; // add 4
    line 3: score = score + 3; // add 3
    line 4: show(score); // show it
31. 31.🔢 In a sign-up flow, what comes right after “type name and email”? (a) enter the code sent (b) see the home screen (c) make a password (d) open the app
32. 32.True or false: a website needs no installing. (a) True (b) False
33. 33.🔀 What does this battery rule show?
    let battery = 47;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
34. 34.🔁 What is the LAST line this code shows?
    let names = ["Meera", "Aman", "Kabir", "Zoya"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Aman (b) Hi, Kabir (c) Hi, Zoya (d) Hi, Meera
35. 35.Which of these fits saving in the cloud? (a) chat messages to friends (b) your last game level (c) the sound on/off setting (d) a draft you are typing
36. 36.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 10, and 100 for everyone else.
    function price(age) {
      if (age <= 10) {
        return 50;
      }
      return 100;
    }
    Test 1: price(16) → expected 100
    Test 2: price(10) → expected 100
    Test 3: price(9) → expected 50 (a) Test 1 (b) Test 3 (c) Test 2
37. 37.🗒️ You are planning version 1 of a quiz app. Which feature can WAIT for a later version? (a) background music (b) show a question (c) check the answer (d) show the score
38. 38.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(27));
39. 39.🚀 Which of these versions is the OLDEST?
    4.14.9, 4.5.7, 3.28.5, 4.3.7 (a) 3.28.5 (b) 4.14.9 (c) 4.5.7 (d) 4.3.7
40. 40.💾 What number does this code show?
    let songs = ["Ocean", "Kites", "Rain", "Sunrise"];
    songs.push("Monsoon");
    show(songs.length);

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