App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 715 · 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 bill = 50; // typed by the user
   line 2: let friends = 2; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 3 (b) line 1 (c) line 4 (d) line 2
2. 2.🔁 What number does this code show?
   let scores = [4, 20, 18, 8];
   let total = 0;
   for (let i = 0; i < scores.length; i++) {
     total = total + scores[i];
   }
   show(total);
3. 3.👆 Code that runs when an event happens is called a ___. (a) headline (b) handler (c) hashtag (d) header
4. 4.🔀 What does this battery rule show?
   let battery = 38;
   if (battery < 20) {
     show("Low battery");
   } else {
     show("Battery OK");
   } (a) Low battery (b) Battery OK
5. 5.📱 Which one comes from an app store: an app or a website? (a) an app (b) a website
6. 6.🗒️ You are planning version 1 of a quiz app. Which feature can WAIT for a later version? (a) check the answer (b) an avatar shop (c) show the score (d) show a question
7. 7.🔢 In a photo-post flow, which comes FIRST? (a) add a filter (b) take the photo (c) write a caption (d) open the camera screen
8. 8.💾 What number does this code show?
   let points = 3;
   points = points - 3;
   points = points + 1;
   show(points);
9. 9.🔢 When you make an app, what comes right after “get an idea”? (a) test the app (b) plan the screens (c) release it (d) build the app
10. 10.🔀 In a good flow, each screen should lead to ___. (a) the same screen (b) a random page (c) a clear next step (d) a dead end
11. 11.✏️ Is this true of a wireframe or of a final design: uses the final pictures? (a) a final design (b) a wireframe
12. 12.Which of these is a feature? (a) “I forget my homework” (b) “What should I cook?” (c) “I keep missing the bus” (d) a search bar
13. 13.True or false: working out a tip is an input. (a) False (b) True
14. 14.🧪 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(9) → expected 50
    Test 2: price(10) → expected 100
    Test 3: price(14) → expected 100 (a) Test 1 (b) Test 2 (c) Test 3
15. 15.🧪 A test fails when ___. (a) both are the same (b) actual is not expected (c) the font is big (d) the app is new
16. 16.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
17. 17.📊 Survey: which problem bugs you most? How many students voted in all?
    wasting pocket money: 6 votes
    no quiet study place: 14 votes
    missing the bus: 9 votes
18. 18.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(36));
19. 19.💾 What number does this code show?
    let score = 9;
    score = score - 5;
    score = score + 4;
    show(score);
20. 20.True or false: you list what users need at the release stage. (a) True (b) False
21. 21.Which of these requests asks for too much? (a) camera app → camera (b) calling app → contacts (c) timer → your photos (d) voice notes → microphone
22. 22.🛠️ At which stage do you pick the features? (a) the build stage (b) the test stage (c) the plan stage (d) the release stage
23. 23.🔁 What is the LAST line this code shows?
    let names = ["Riya", "Meera", "Aman", "Kabir", "Arjun"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Meera (b) Hi, Aman (c) Hi, Riya (d) Hi, Arjun
24. 24.🔢 In a quiz-app flow, which comes first: “see the final score” or “pick an answer”? (a) pick an answer (b) see the final score
25. 25.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. tap the Feed tab
    2. open “Edit photo”
    3. open “Help page”
    How many times must you tap Back to reach the main screen of this tab?
26. 26.🔢 When you make an app, which comes first: “get an idea” or “plan the screens”? (a) plan the screens (b) get an idea
27. 27.✏️ A box with a cross in a wireframe usually means ___. (a) a closed app (b) delete this (c) an error (d) a picture goes here
28. 28.🧩 Which of these is a button on this screen?
    [title] Add Homework
    [button] Save
    [text box] City
    [slider] Text size
    [switch] Show hints
    [text box] Age
    [text box] Name (a) City (b) Save (c) Name (d) Age
29. 29.🐞 Finding and fixing bugs is called ___. (a) downloading (b) decorating (c) debugging (d) designing
30. 30.🗂️ What kind of app is an alarm clock? (a) a learning app (b) a game (c) a health app (d) a tool app
31. 31.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(50, 2));
32. 32.True or false: the sound on/off setting fits saving on the phone. (a) False (b) True
33. 33.True or false: a wireframe shows where things go. (a) False (b) True
34. 34.Which of these is a screen? (a) today’s step count (b) the game-over page (c) a switch for dark mode (d) a slider for volume
35. 35.Which of these app ideas solves a real problem? (a) a button with no action (b) an app that just says hi (c) a bill splitter (d) a page of random dots
36. 36.🔐 Is this permission request fair or too much: camera app → camera? (a) too much (b) fair
37. 37.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(30, 4));
38. 38.🔁 What number does this code show?
    let steps = [4, 13, 3];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
39. 39.Which of these is true of the back button? (a) opens a list of pages (b) goes to the last screen (c) sits at the bottom (d) shows 3 to 5 icons
40. 40.💾 Data saved only on the phone is lost when ___. (a) the app is closed (b) you send a message (c) the phone is lost (d) the screen turns off

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