App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 418 · 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.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
   1. open “Badges”
   2. tap Back
   3. open “Friend list”
   Which screen are you on now? (a) Quiz (b) Badges (c) Lessons (d) Friend list
2. 2.👆 An event in an app is ___. (a) a kind of list (b) something that happens (c) a colour theme (d) an app store
3. 3.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
   1. open “Match report”
   2. tap Back
   3. open “Edit photo”
   4. open “Friend list”
   How many times must you tap Back to reach the main screen of this tab?
4. 4.🔁 What number does this code show?
   let scores = [5, 3, 16, 18, 5];
   let best = 0;
   for (let i = 0; i < scores.length; i++) {
     if (scores[i] > best) {
       best = scores[i];
     }
   }
   show(best);
5. 5.Which of these is true of an app? (a) opens in a web browser (b) has a web address (c) opens from a link (d) is installed on a phone
6. 6.👥 A school app has 115 students, 165 teachers and 290 parents as users. How many users does it have in all?
7. 7.Which of these is true of an app? (a) has a web address (b) opens in a web browser (c) opens from a link (d) has a home-screen icon
8. 8.🎨 UI stands for user ___. (a) internet (b) idea (c) input (d) interface
9. 9.True or false: an app has a home-screen icon. (a) True (b) False
10. 10.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) share tasks to friends (b) see tasks by day (c) earn stickers (d) pick a theme colour
11. 11.♿ Showing right or wrong only in red and green is a problem for ___. (a) the battery (b) colour-blind users (c) fast typists (d) the server
12. 12.💾 pop() takes off the last item. What does this code show?
    let friends = ["Riya", "Kabir", "Arjun", "Meera", "Zoya"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Riya (b) Kabir (c) Arjun (d) Meera
13. 13.True or false: the screen layout is about UX (the experience). (a) True (b) False
14. 14.Which of these is true of a menu button? (a) sits at the bottom (b) goes to the last screen (c) undoes one move (d) hides extra links
15. 15.🗒️ Version 1 of a bus tracker must be ready in 9 days. How many days are left for extras after the must-haves?
    see where the bus is: 1 days
    show arrival time: 2 days
    pick your bus stop: 3 days
16. 16.💡 Does an app idea like a free study-room finder solve a real problem? (a) Yes (b) No
17. 17.🔢 In a food-order flow, what comes right after “pay for the order”? (a) add it to the cart (b) open the menu (c) track the order (d) pick a dish
18. 18.🗒️ A to-do app with no “add a task” feature is ___. (a) missing a must-have (b) a nice extra (c) well planned (d) ready to release
19. 19.🔀 What does this battery rule show?
    let battery = 28;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
20. 20.💡 Which app idea solves this problem: nobody knows whose bag it is? (a) a medicine reminder (b) a homework planner (c) a lost-and-found board (d) a bill splitter
21. 21.Which of these is an input? (a) a slider for volume (b) tap to Send (c) your friends list (d) tap to Save
22. 22.🔢 In a photo-post flow, which comes first: “post the photo” or “add a filter”? (a) add a filter (b) post the photo
23. 23.🔀 What does this sign-up rule show?
    let age = 17;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 240; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 2 (b) line 3 (c) line 1 (d) line 4
25. 25.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 28 px tall
    Send button: 52 px tall
    Save button: 60 px tall
    Cancel button: 60 px tall (a) Cancel (b) Save (c) Back (d) Send
26. 26.💡 A good app idea starts with ___. (a) a cool logo (b) a problem to solve (c) a long name (d) many colours
27. 27.♿ What should every icon-only button have for screen readers? (a) a sound (b) a text label (c) a long animation (d) a bright colour
28. 28.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 40 px tall
    Done button: 48 px tall
    Send button: 64 px tall
29. 29.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
30. 30.🔢 When you make an app, which comes first: “plan the screens” or “build the app”? (a) plan the screens (b) build the app
31. 31.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(95, 2));
32. 32.True or false: taking a photo is an output. (a) True (b) False
33. 33.💡 After a survey, which need should version 1 solve? (a) a random need (b) the rarest need (c) the most common need (d) the newest trend
34. 34.Which of these app ideas solves no real problem? (a) a library due-date alert (b) a free study-room finder (c) a medicine reminder (d) a blank grey screen
35. 35.🛠️ At which stage do you add the buttons? (a) the idea stage (b) the build stage (c) the plan stage (d) the release stage
36. 36.🔁 What number does this code show?
    let runs = [44, 90, 28, 66, 62];
    let count = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] >= 50) {
        count = count + 1;
      }
    }
    show(count);
37. 37.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Edit Profile
    [button] Help
    [button] Start
    [text box] Phone
    [switch] Show hints
38. 38.True or false: a finger hits Like is a tap event. (a) False (b) True
39. 39.True or false: a cricket run chase is a learning app. (a) True (b) False
40. 40.🔀 What does this PIN rule show?
    let pin = "43998";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) Use 4 digits (b) PIN saved

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