App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 373 · 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.🗒️ You are planning version 1 of a pocket-money tracker. Which feature can WAIT for a later version? (a) add money received (b) add money spent (c) show the balance (d) export to a file
2. 2.🧰 What does this code show?
   function greet(name) {
     return "Hello, " + name + "!";
   }
   show(greet("Zoya")); (a) Hello, Zoya! (b) Zoya (c) Hello, name! (d) greet
3. 3.True or false: an app updates from the store. (a) False (b) True
4. 4.True or false: chat messages to friends fits saving in the cloud. (a) False (b) True
5. 5.👆 The user taps the button 4 times. What number does the label show now?
   let score = 1;
   button.onTap = function () {
     score = score + 2;
     label.text = score;
   };
6. 6.📊 Survey: which problem bugs you most? How many more votes did “losing water bottles” get than “forgetting homework”?
   missing the bus: 23 votes
   losing water bottles: 24 votes
   forgetting homework: 6 votes
7. 7.🔍 Which is the odd one out? (a) share the download link (b) connect the data (c) write the code (d) add the buttons
8. 8.True or false: how fast a task is done is about UX (the experience). (a) False (b) True
9. 9.🧰 What does this code show?
   function greet(name) {
     return "Hi, " + name + "!";
   }
   show(greet("Aman")); (a) Hi, name! (b) Aman (c) Hi, Aman! (d) greet
10. 10.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) set a reminder time (b) see today’s total (c) share your streak (d) log a glass of water
11. 11.🧰 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(10) + fee(12));
12. 12.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 37; // start at 37
    line 2: stars = stars - 4; // take away 4
    line 3: stars = stars * 2; // double it
    line 4: stars = stars - 3; // take away 2
    line 5: show(stars); // show it
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 10; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
14. 14.🔍 Which is the odd one out? (a) list what users need (b) let friends try it (c) try every button (d) write down the bugs
15. 15.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) pie-chart colours (b) export to a file (c) add money received (d) savings stickers
16. 16.🔐 Is this permission request fair or too much: map app → location? (a) fair (b) too much
17. 17.🧪 How many of these test cases pass?
    🎟️ 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(20) → expected 100
    Test 3: price(9) → expected 50
18. 18.🔀 What number does this shop app show?
    let total = 470;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
19. 19.💡 Which app idea solves this problem: friends argue over who pays? (a) a study-room finder (b) a bill splitter (c) a medicine reminder (d) a lost-and-found board
20. 20.🌗 Is red on green easy or hard to read on a button? (a) easy to read (b) hard to read
21. 21.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
22. 22.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 7 or more right answers.
    function result(right) {
      if (right > 7) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(9) → expected Pass
    Test 2: result(4) → expected Try again
    Test 3: result(7) → expected Pass (a) Test 1 (b) Test 2 (c) Test 3
23. 23.💾 Data saved only on the phone is lost when ___. (a) the screen turns off (b) the app is closed (c) the phone is lost (d) you send a message
24. 24.🧪 What is the ACTUAL result of Test 3?
    🚚 Rule: delivery is free (0) when the order is 400 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 400) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(550) → expected 0
    Test 2: delivery(450) → expected 0
    Test 3: delivery(250) → expected 40
25. 25.♿ Why add captions to videos? (a) so anyone can follow (b) to slow them down (c) to add colour (d) to hide the sound
26. 26.🔀 What does this PIN rule show?
    let pin = "12441";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
27. 27.🛠️ At which stage do you write the code? (a) the idea stage (b) the release stage (c) the test stage (d) the build stage
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 500; // typed by the user
    line 2: let off = 50; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 2 (c) line 4 (d) line 1
29. 29.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(3) + points(3));
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 36 px tall
    Send button: 72 px tall
    Help button: 60 px tall
    Next button: 72 px tall (a) Next (b) Send (c) Save (d) Help
31. 31.🧪 One test case fails. Which one?
    🚚 Rule: delivery is free (0) when the order is 500 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 500) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(800) → expected 0
    Test 2: delivery(350) → expected 40
    Test 3: delivery(500) → expected 0 (a) Test 2 (b) Test 1 (c) Test 3
32. 32.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Edit photo”
    2. tap the Me tab
    3. open “Help page”
    4. tap the Lessons tab
    5. open “Video”
    Which screen are you on now? (a) Help page (b) Edit photo (c) Lessons (d) Video
33. 33.💡 An app that tries to do everything at once is usually ___. (a) easy to build (b) finished fast (c) hard to use (d) very small
34. 34.🔀 What does this sign-up rule show?
    let age = 15;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Ask a parent (b) Welcome!
35. 35.🧩 In an app, what is the game-over page? (a) data (b) an input (c) a screen (d) a button
36. 36.✏️ Is this true of a wireframe or of a final design: is a quick sketch? (a) a final design (b) a wireframe
37. 37.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ Add button ]
    [ tab bar ]
    [ title text ]
    [ Save button ] (a) Save button (b) tab bar (c) Add button (d) title text
38. 38.Which of these is about UX (the experience)? (a) the font size (b) how easy sign-up is (c) the button colours (d) the screen layout
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 95; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 3 (b) line 2 (c) line 1 (d) line 4
40. 40.Which of these is true of a menu button? (a) shows 3 to 5 icons (b) sits at the bottom (c) hides extra links (d) switches main sections

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