App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 734 · 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.🧪 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(10) → expected 100
   Test 2: price(11) → expected 100
   Test 3: price(6) → expected 50 (a) Test 3 (b) Test 2 (c) Test 1
2. 2.True or false: you write the code at the build stage. (a) True (b) False
3. 3.Which of these is an input? (a) sorting the scores (b) a result on screen (c) speaking a command (d) a buzz (vibration)
4. 4.Which of these is true of a website? (a) opens from a link (b) has a home-screen icon (c) is installed on a phone (d) updates from the store
5. 5.Which of these is a feature? (a) a dark mode switch (b) “I keep missing the bus” (c) “Small text is hard” (d) “What should I cook?”
6. 6.🎨 Is this about UI or UX: how easy sign-up is? (a) UI (b) UX
7. 7.🔀 What does this PIN rule show?
   let pin = "741";
   if (pin.length === 4) {
     show("PIN saved");
   } else {
     show("Use 4 digits");
   } (a) Use 4 digits (b) PIN saved
8. 8.✏️ Why draw a wireframe before coding? (a) it saves data (b) changes are quick (c) it runs the app (d) it adds colours
9. 9.🧰 A museum app works out the entry fee. What number does this code show?
   function fee(age) {
     if (age < 5) {
       return 0;
     }
     return 20;
   }
   show(fee(2) + fee(1));
10. 10.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 64 px tall
    Back button: 40 px tall
    Next button: 68 px tall (a) Done (b) Back (c) Next
11. 11.🗂️ What kind of app is a torch? (a) a game (b) a tool app (c) a health app (d) a learning app
12. 12.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    losing water bottles: 8 votes
    no quiet study place: 6 votes
    wasting pocket money: 13 votes (a) losing water bottles (b) wasting pocket money (c) no quiet study place
13. 13.🧭 Where is a tab bar usually placed in a phone app? (a) inside a button (b) at the bottom (c) in the middle (d) nowhere
14. 14.🔢 After an app is released, which comes first: “read user reviews” or “release an update”? (a) release an update (b) read user reviews
15. 15.🔢 After an app is released, which comes first: “test it again” or “release an update”? (a) test it again (b) release an update
16. 16.Which of these is about UI (the look)? (a) how fast a task is done (b) the font size (c) how users feel after (d) whether users get lost
17. 17.🔀 What is a user flow? (a) a type of font (b) a colour theme (c) the path through screens (d) a charging cable
18. 18.🔁 What number does this code show?
    let scores = [54, 16, 60];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 40) {
        count = count + 1;
      }
    }
    show(count);
19. 19.🧪 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(5) → expected 50
    Test 2: price(10) → expected 100
    Test 3: price(9) → expected 100
20. 20.🖼️ How many parts (boxes) does this wireframe have?
    [ search box ]
    [ big picture ]
    [ tab bar ]
    [ Add button ]
    [ title text ]
    [ list of items ]
21. 21.🔁 What is the LAST line this code shows?
    let names = ["Arjun", "Zoya", "Aman", "Riya", "Meera"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Meera (b) Hi, Aman (c) Hi, Arjun (d) Hi, Zoya
22. 22.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let points = 41; // start at 41
    line 2: points = points * 2; // double it
    line 3: points = points + 4; // take away 4
    line 4: show(points); // show it
23. 23.🧩 Which of these is a button on this screen?
    [title] New Note
    [text box] City
    [button] Back
    [button] Cancel (a) City (b) Back
24. 24.Which of these fits saving in the cloud? (a) a draft you are typing (b) photos on two devices (c) notes to read offline (d) the sound on/off setting
25. 25.🖼️ In this wireframe (top to bottom), what is right above the top bar?
    [ Save button ]
    [ search box ]
    [ Add button ]
    [ top bar ]
    [ big picture ]
    [ list of items ] (a) list of items (b) Save button (c) Add button (d) big picture
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 3 (b) line 2 (c) line 1
27. 27.🔍 Which is the odd one out? (a) checking a password (b) working out a tip (c) a result on screen (d) sorting the scores
28. 28.Which of these helps everyone use the app? (a) icons with no labels (b) fast-flashing lights (c) strong colour contrast (d) colour as the only clue
29. 29.🗒️ You are planning version 1 of a quiz app. Which feature is a MUST-HAVE? (a) background music (b) confetti effects (c) an avatar shop (d) show a question
30. 30.🧪 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(10) → expected 100
    Test 2: price(8) → expected 100
    Test 3: price(5) → expected 50 (a) Test 2 (b) Test 1 (c) Test 3
31. 31.True or false: the icon shapes is about UI (the look). (a) True (b) False
32. 32.👆 The user taps the button 6 times. What number does the label show now?
    let points = 8;
    button.onTap = function () {
      points = points + 3;
      label.text = points;
    };
33. 33.👆 Code that runs when an event happens is called a ___. (a) handler (b) headline (c) hashtag (d) header
34. 34.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Map”
    2. tap Back
    3. tap the Home tab
    4. tap the Profile tab
    5. open “Score card”
    Which screen are you on now? (a) Score card (b) Home (c) Map (d) Search
35. 35.Which colour pair is easy to read? (a) red on green (b) pale pink on white (c) dark blue on black (d) white on black
36. 36.True or false: a countdown hits zero is a text event. (a) False (b) True
37. 37.🔍 Which is the odd one out? (a) sketch the screens (b) put it on an app store (c) pick the features (d) draw the user flow
38. 38.⚙️ What number does this app show?
    let price = 45; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
39. 39.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Offers → Confirm → Size → Results → Item
    Design B: Home → Offers → Search → Menu
40. 40.🔢 In a food-order flow, which comes first: “pick a dish” or “check the cart”? (a) check the cart (b) pick a dish

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