App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 62 · 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 line does the processing (works out the answer)?
   line 1: let price = 30; // typed by the user
   line 2: let qty = 5; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 2 (b) line 1 (c) line 3 (d) line 4
2. 2.🔀 What does >= mean? (a) less than (b) greater than or equal (c) smaller or equal (d) not equal
3. 3.🧪 How many of these test cases pass?
   🎟️ 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(15) → expected 100
   Test 2: price(7) → expected 50
   Test 3: price(16) → expected 100
4. 4.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let lives = 42; // start at 39
   line 2: lives = lives + 4; // add 4
   line 3: lives = lives + 6; // add 6
   line 4: lives = lives * 2; // double it
   line 5: show(lives); // show it (a) line 1 (b) line 4 (c) line 3 (d) line 2
5. 5.🧰 A museum app works out the entry fee. What number does this code show?
   function fee(age) {
     if (age < 5) {
       return 0;
     }
     return 50;
   }
   show(fee(11) + fee(3));
6. 6.🎯 Is this a user need or a feature: “I keep missing the bus”? (a) a feature (b) a user need
7. 7.🔀 Which badge does this quiz app show?
   let marks = 58;
   if (marks >= 80) {
     show("Gold");
   } else if (marks >= 50) {
     show("Silver");
   } else {
     show("Bronze");
   } (a) Bronze (b) Gold (c) Silver
8. 8.🔁 What is the LAST line this code shows?
   let names = ["Zoya", "Meera", "Arjun", "Aman"];
   for (let i = 0; i < names.length; i++) {
     show("Hi, " + names[i]);
   } (a) Hi, Arjun (b) Hi, Meera (c) Hi, Zoya (d) Hi, Aman
9. 9.🔁 Why use a loop to show 100 messages? (a) it hides them (b) it uses more lines (c) less code to write (d) it is slower
10. 10.🔁 What is the LAST line this code shows?
    let names = ["Zoya", "Kabir", "Meera", "Arjun"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Arjun (b) Hi, Zoya (c) Hi, Kabir (d) Hi, Meera
11. 11.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Edit photo”
    2. tap Back
    3. open “Video”
    Which screen are you on now? (a) Video (b) Edit photo (c) Search (d) Home
12. 12.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 40;
    }
    show(fee(2) + fee(10));
13. 13.Which of these fits saving on the phone? (a) chat messages to friends (b) a class leaderboard (c) notes to read offline (d) photos on two devices
14. 14.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(75, 6));
15. 15.🎯 Is this a user need or a feature: a search bar? (a) a user need (b) a feature
16. 16.🗒️ A to-do app with no “add a task” feature is ___. (a) missing a must-have (b) well planned (c) a nice extra (d) ready to release
17. 17.True or false: a 5-minute alarm ends is a text event. (a) True (b) False
18. 18.🔘 Our rule: buttons are at least 48 px tall. The Next button is 24 px tall. How many px taller must it be?
19. 19.🧪 One test case fails. Which one?
    🎟️ 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(7) → expected 50
    Test 2: price(14) → expected 100
    Test 3: price(8) → expected 100 (a) Test 2 (b) Test 1 (c) Test 3
20. 20.📊 Survey: which problem bugs you most? How many more votes did “no quiet study place” get than “missing the bus”?
    no quiet study place: 6 votes
    missing the bus: 3 votes
    losing water bottles: 17 votes
21. 21.🔀 What number does this shop app show?
    let total = 760;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
22. 22.🐞 What is a bug? (a) a nice icon (b) a new feature (c) a fast phone (d) a mistake in the code
23. 23.🧰 What does this code show?
    function greet(name) {
      return "Welcome, " + name + "!";
    }
    show(greet("Kabir")); (a) Welcome, name! (b) Kabir (c) greet (d) Welcome, Kabir!
24. 24.Which of these makes the app harder to use? (a) big touch targets (b) labels on every icon (c) strong colour contrast (d) icons with no labels
25. 25.Which of these is an input? (a) adding up a bill (b) sorting the scores (c) typing your age (d) checking a password
26. 26.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 13, and 100 for everyone else.
    function price(age) {
      if (age <= 13) {
        return 50;
      }
      return 100;
    }
    Test 1: price(18) → expected 100
    Test 2: price(12) → expected 50
    Test 3: price(13) → expected 100 (a) Test 3 (b) Test 1 (c) Test 2
27. 27.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Quiz tab
    2. open “Badges”
    3. tap the Me tab
    4. tap the Me tab
    Which screen are you on now? (a) Quiz (b) Me (c) Lessons (d) Badges
28. 28.Which of these is true of a menu button? (a) hides extra links (b) sits at the bottom (c) undoes one move (d) switches main sections
29. 29.🔁 What number does this code show?
    let runs = [18, 6, 10, 14, 1];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
30. 30.True or false: adding up a bill is an output. (a) False (b) True
31. 31.Which of these is true of a tab bar? (a) switches main sections (b) undoes one move (c) opens a list of pages (d) goes to the last screen
32. 32.👥 A school app has 190 students, 85 teachers and 65 parents as users. How many more students than parents are there?
33. 33.💡 Which app idea solves this problem: a team shares one snack bill? (a) a lost-and-found board (b) a medicine reminder (c) a homework planner (d) a bill splitter
34. 34.Which colour pair is easy to read? (a) red on green (b) yellow on white (c) dark blue on white (d) light grey on white
35. 35.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Match report”
    2. open “Match report”
    3. open “Help page”
    4. open “Friend list”
    How many times must you tap Back to reach the main screen of this tab?
36. 36.🔀 A screen with no way forward or back is called a ___. (a) home screen (b) tab bar (c) dead end (d) shortcut
37. 37.🔀 What does this sign-up rule show?
    let age = 14;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Ask a parent (b) Welcome!
38. 38.👆 The user types Meera in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Hello, " + nameBox.text + "!";
    }; (a) Meera (b) Hello, Meera! (c) Hello! (d) Hello, nameBox.text!
39. 39.🚀 Which of these versions is the OLDEST?
    4.11.4, 4.7.6, 4.3.6, 3.23.8 (a) 3.23.8 (b) 4.7.6 (c) 4.3.6 (d) 4.11.4
40. 40.🔢 In a quiz-app flow, what comes right after “read a question”? (a) tap “Start quiz” (b) pick an answer (c) see the final score (d) see if it is right

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