App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 763 · 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 app show?
   let price = 40; // typed by the user
   let qty = 5; // typed by the user
   let total = price * qty;
   show(total);
2. 2.🧰 What number does this code show?
   function points(stars) {
     return stars * 10 + 5;
   }
   show(points(1) + points(1));
3. 3.True or false: you list what users need at the idea stage. (a) False (b) True
4. 4.🗂️ What kind of app is a word battle? (a) a health app (b) a learning app (c) a tool app (d) a game
5. 5.🖼️ How many parts (boxes) does this wireframe have?
   [ Add button ]
   [ top bar ]
   [ menu icon ]
   [ big picture ]
   [ title text ]
6. 6.🗒️ The first small, working version of an app is often called an ___. (a) URL (b) FAQ (c) MVP (d) CPU
7. 7.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
8. 8.💾 What number does this code show?
   let lives = 3;
   lives = lives - 1;
   lives = lives + 3;
   show(lives);
9. 9.🧪 What is the ACTUAL result of Test 2?
   🎟️ 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(12) → expected 100
   Test 2: price(10) → expected 100
   Test 3: price(8) → expected 50
10. 10.True or false: a speak-to-type notes app needs your location. (a) True (b) False
11. 11.Which of these is an input? (a) the log-in page (b) a date picker (c) today’s step count (d) the settings page
12. 12.🧩 Which of these is a button on this screen?
    [title] Add Homework
    [button] Cancel
    [text box] Name
    [switch] Show hints (a) Show hints (b) Cancel (c) Name
13. 13.🚀 Your app is at version 4.3.4. The next release is a big redesign that changes how the app works. What is its version number? (a) 4.4.4 (b) 4.3.5 (c) 5.0.0 (d) 4.4.0
14. 14.🔁 What number does this code show?
    let scores = [14, 2, 8];
    let best = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] > best) {
        best = scores[i];
      }
    }
    show(best);
15. 15.🧪 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(8) → expected 50
    Test 2: price(10) → expected 100
    Test 3: price(11) → expected 100 (a) Test 3 (b) Test 2 (c) Test 1
16. 16.🔀 What number does this shop app show?
    let total = 730;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
17. 17.🔍 Which is the odd one out? (a) a sleep tracker (b) a times-table quiz (c) a flashcard trainer (d) a spelling coach
18. 18.True or false: you connect the data at the plan stage. (a) False (b) True
19. 19.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 32; // start at 32
    line 2: lives = lives * 2; // double it
    line 3: lives = lives * 2; // double it
    line 4: lives = lives + 4; // take away 4
    line 5: show(lives); // show it
20. 20.🔢 When you make an app, which comes first: “test the app” or “release it”? (a) test the app (b) release it
21. 21.👆 The user taps the button 2 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 3) {
        likes = likes + 1;
      }
      label.text = likes;
    };
22. 22.Which of these is an output? (a) a beep sound (b) adding up a bill (c) checking a password (d) typing your age
23. 23.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) set a due date (b) pick a theme colour (c) add a homework task (d) see tasks by day
24. 24.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Map”
    2. tap Back
    3. tap the Search tab
    4. open “Edit photo”
    5. tap the Home tab
    Which screen are you on now? (a) Home (b) Map (c) Search (d) Edit photo
25. 25.🔁 What does a loop do? (a) repeats code (b) saves photos (c) deletes code (d) draws icons
26. 26.📱 Which one is installed on a phone: an app or a website? (a) a website (b) an app
27. 27.🧰 What does this code show?
    function greet(name) {
      return "Hi, " + name + "!";
    }
    show(greet("Arjun")); (a) Arjun (b) Hi, Arjun! (c) Hi, name! (d) greet
28. 28.🔢 In a sign-up flow, which comes FIRST? (a) tap “Sign up” (b) enter the code sent (c) make a password (d) open the app
29. 29.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Match report”
    2. tap Back
    3. open “Score card”
    4. tap Back
    5. open “Score card”
    How many times must you tap Back to reach the main screen of this tab?
30. 30.👆 The user taps the button 1 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 2) {
        likes = likes + 1;
      }
      label.text = likes;
    };
31. 31.True or false: the home page of an app is a screen. (a) False (b) True
32. 32.Which of these is an input? (a) sorting the scores (b) a buzz (vibration) (c) a result on screen (d) speaking a command
33. 33.🔢 In a quiz-app flow, which comes LAST? (a) read a question (b) tap “Start quiz” (c) pick an answer (d) see the final score
34. 34.True or false: an app updates from the store. (a) False (b) True
35. 35.True or false: a bus tracker is the best fit for a student who often misses the school bus. (a) False (b) True
36. 36.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let score = 45; // start at 45
    line 2: score = score * 2; // double it
    line 3: score = score + 4; // take away 4
    line 4: show(score); // show it (a) line 2 (b) line 1 (c) line 3
37. 37.🧭 Which part of navigation opens a list of pages? (a) a menu button (b) a tab bar (c) the back button
38. 38.🔍 Which is the odd one out? (a) strong colour contrast (b) icons with no labels (c) fast-flashing lights (d) colour as the only clue
39. 39.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 40; // start at 40
    line 2: stars = stars - 2; // take away 2
    line 3: stars = stars * 3; // double it
    line 4: show(stars); // show it
40. 40.Which of these is an output? (a) speaking a command (b) sorting the scores (c) a pop-up message (d) taking a photo

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