App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 530 · 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 is the ACTUAL result of Test 1?
   🎟️ Rule: a ticket costs 50 for children under 12, and 100 for everyone else.
   function price(age) {
     if (age < 12) {
       return 50;
     }
     return 100;
   }
   Test 1: price(17) → expected 100
   Test 2: price(11) → expected 50
   Test 3: price(19) → expected 100
2. 2.🔁 What number does this code show?
   let marks = [96, 84, 65, 54, 84];
   let count = 0;
   for (let i = 0; i < marks.length; i++) {
     if (marks[i] >= 70) {
       count = count + 1;
     }
   }
   show(count);
3. 3.🎯 Is this a user need or a feature: “What should I cook?”? (a) a feature (b) a user need
4. 4.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
   [title] Edit Profile
   [text box] Phone
   [text box] Due date
   [button] Start
   [button] Done
   [slider] Brightness
   [button] Cancel
5. 5.🔁 Why use a loop to show 100 messages? (a) it uses more lines (b) it is slower (c) less code to write (d) it hides them
6. 6.💡 Which app idea solves this problem: pupils forget due dates? (a) a bill splitter (b) a lost-and-found board (c) a study-room finder (d) a homework planner
7. 7.🔢 In a sign-up flow, which comes first: “tap “Sign up”” or “open the app”? (a) open the app (b) tap “Sign up”
8. 8.🔀 What does this sign-up rule show?
   let age = 9;
   if (age >= 13) {
     show("Welcome!");
   } else {
     show("Ask a parent");
   } (a) Welcome! (b) Ask a parent
9. 9.🧩 In an app, what is your friends list? (a) a screen (b) data (c) a button (d) an input
10. 10.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Sign Up
    [button] Cancel
    [button] Next
    [slider] Brightness
    [text box] Phone
11. 11.💾 What number does this code show?
    let friends = ["Zoya", "Meera"];
    friends.push("Kabir");
    friends.push("Aman");
    show(friends.length);
12. 12.📱 Which one has a web address: an app or a website? (a) an app (b) a website
13. 13.True or false: you connect the data at the test stage. (a) True (b) False
14. 14.🧩 In an app, what is tap to go Next? (a) a button (b) data (c) an input (d) a screen
15. 15.🧭 Where is a tab bar usually placed in a phone app? (a) in the middle (b) at the bottom (c) nowhere (d) inside a button
16. 16.True or false: taking a photo is an output. (a) True (b) False
17. 17.True or false: the settings page is a screen. (a) True (b) False
18. 18.🔁 What is the LAST line this code shows?
    let names = ["Arjun", "Aman", "Meera"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Aman (b) Hi, Arjun (c) Hi, Meera
19. 19.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Body text: 28 px
    Label: 20 px
    Title: 9 px (a) Label (b) Body text (c) Title
20. 20.🔀 What does this PIN rule show?
    let pin = "3272";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
21. 21.🚀 In version 2.5.1, which number is the major version? (a) 1 (b) 2 (c) 251 (d) 5
22. 22.True or false: a bill splitter solves no real problem. (a) True (b) False
23. 23.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 56 px tall
    Send button: 44 px tall
    Next button: 52 px tall
24. 24.True or false: “labels on every icon” helps everyone use the app. (a) True (b) False
25. 25.🎨 Is this about UI or UX: the button colours? (a) UX (b) UI
26. 26.True or false: a water reminder is the best fit for a teen whose money runs out by Friday. (a) False (b) True
27. 27.🧭 Which part of navigation hides extra links? (a) a menu button (b) the back button (c) a tab bar
28. 28.📊 Survey: which problem bugs you most? How many students voted in all?
    no quiet study place: 8 votes
    wasting pocket money: 6 votes
    forgetting homework: 7 votes
29. 29.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Edit Profile
    [button] Next
    [text box] City
    [text box] Phone
    [button] Save
    [text box] Subject
    [slider] Text size
    [switch] Remind me
    [button] Send
30. 30.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 43; // start at 43
    line 2: coins = coins * 2; // double it
    line 3: coins = coins - 2; // add 2
    line 4: show(coins); // show it
31. 31.📊 Survey: which problem bugs you most? How many more votes did “forgetting homework” get than “missing the bus”?
    forgetting homework: 17 votes
    forgetting birthdays: 13 votes
    missing the bus: 9 votes
32. 32.Which of these is true of a menu button? (a) hides extra links (b) switches main sections (c) undoes one move (d) goes to the last screen
33. 33.True or false: a final design uses plain grey boxes. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) working out a tip (b) speaking a command (c) taking a photo (d) typing your age
35. 35.True or false: a recipe finder is the best fit for a student who often misses the school bus. (a) True (b) False
36. 36.🔀 What number does this shop app show?
    let total = 280;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
37. 37.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Map”
    2. tap Back
    3. open “Score card”
    Which screen are you on now? (a) Score card (b) Quiz (c) Lessons (d) Map
38. 38.True or false: the user taps Play is a tap event. (a) False (b) True
39. 39.👆 The user types Riya in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Hi, " + nameBox.text + "!";
    }; (a) Hi, nameBox.text! (b) Riya (c) Hi, Riya! (d) Hi!
40. 40.👆 “On tap → do this” links an event to ___. (a) a charger (b) a font (c) an action (d) a web address

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