App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 968 · 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.True or false: a website is installed on a phone. (a) True (b) False
2. 2.🧭 Which part of navigation opens a list of pages? (a) a tab bar (b) a menu button (c) the back button
3. 3.🔍 Which is the odd one out? (a) big touch targets (b) labels on every icon (c) captions on videos (d) sudden loud sounds
4. 4.🗒️ Version 1 of a pocket-money tracker must be ready in 17 days. How many days are left for extras after the must-haves?
   add money received: 3 days
   add money spent: 3 days
   show the balance: 5 days
5. 5.🔁 What number does this code show?
   let runs = [64, 34, 40, 88, 59];
   let count = 0;
   for (let i = 0; i < runs.length; i++) {
     if (runs[i] >= 70) {
       count = count + 1;
     }
   }
   show(count);
6. 6.🔀 What does this sign-up rule show?
   let age = 16;
   if (age >= 13) {
     show("Welcome!");
   } else {
     show("Ask a parent");
   } (a) Welcome! (b) Ask a parent
7. 7.👆 The user taps the button 5 times. What does the label show now?
   let on = false;
   button.onTap = function () {
     on = !on;
     if (on) {
       label.text = "ON";
     } else {
       label.text = "OFF";
     }
   }; (a) ON (b) OFF
8. 8.Which of these is about UI (the look)? (a) how easy sign-up is (b) how fast a task is done (c) the theme colours (d) how many taps it takes
9. 9.📅 An app team plans for 4 days, builds for 10 days, tests for 3 days and releases on 1 more day. Planning starts on day 1. On which day does building finish?
10. 10.📱 Which one opens from a link: an app or a website? (a) an app (b) a website
11. 11.🎯 Is this a user need or a feature: a dark mode switch? (a) a feature (b) a user need
12. 12.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(8));
13. 13.🔁 Why use a loop to show 100 messages? (a) it is slower (b) less code to write (c) it uses more lines (d) it hides them
14. 14.True or false: the font size is about UX (the experience). (a) True (b) False
15. 15.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 30; // start at 30
    line 2: lives = lives - 1; // take away 1
    line 3: lives = lives + 2; // take away 2
    line 4: show(lives); // show it
16. 16.🔀 What does this battery rule show?
    let battery = 56;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
17. 17.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 28 px tall
    Send button: 48 px tall
    Save button: 56 px tall
    Back button: 52 px tall (a) Start (b) Save (c) Send (d) Back
18. 18.🔀 What number does this shop app show?
    let total = 860;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
19. 19.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 14, and 100 for everyone else.
    function price(age) {
      if (age <= 14) {
        return 50;
      }
      return 100;
    }
    Test 1: price(20) → expected 100
    Test 2: price(13) → expected 50
    Test 3: price(14) → expected 100 (a) Test 2 (b) Test 3 (c) Test 1
20. 20.Which of these is an output? (a) working out a tip (b) adding up a bill (c) a result on screen (d) speaking a command
21. 21.True or false: a bus tracker is the best fit for a grandparent with weak eyesight. (a) False (b) True
22. 22.True or false: a pop-up message is an output. (a) True (b) False
23. 23.📴 Which of these can often still work with no internet? (a) an online search (b) a new website (c) a video call (d) an installed app
24. 24.🗒️ When should nice-to-have features be built? (a) after the must-haves (b) before anything (c) on day one (d) never
25. 25.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 31; // start at 31
    line 2: score = score + 2; // double it
    line 3: score = score - 3; // take away 3
    line 4: score = score - 5; // take away 5
    line 5: show(score); // show it
26. 26.Which of these is a screen? (a) tap to Start (b) the settings page (c) tap to Save (d) your friends list
27. 27.🧩 How many buttons does this app screen have?
    [title] New Note
    [button] Save
    [button] Cancel
    [text box] Age
    [text box] Subject
    [slider] Text size
28. 28.👆 What kind of event is this: one second passes? (a) a load event (b) a timer event (c) a text event (d) a tap event
29. 29.⚙️ What number does this app show?
    let km = 10; // typed by the user
    let metres = km * 1000;
    show(metres);
30. 30.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let coins = 36; // start at 34
    line 2: coins = coins + 4; // add 4
    line 3: coins = coins * 2; // double it
    line 4: show(coins); // show it
31. 31.True or false: working out a tip is processing. (a) False (b) True
32. 32.True or false: a clear word like Save is good button design. (a) False (b) True
33. 33.👆 The user taps the button 6 times. What number does the label show now?
    let stars = 5;
    button.onTap = function () {
      stars = stars + 1;
      label.text = stars;
    };
34. 34.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Footer: 18 px
    Title: 17 px
    Menu: 28 px
    Label: 10 px (a) Label (b) Footer (c) Title (d) Menu
35. 35.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Match report”
    2. open “Edit photo”
    3. tap Back
    Which screen are you on now? (a) Search (b) Match report (c) Home (d) Edit photo
36. 36.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 600 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 600) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(850) → expected 0
    Test 2: delivery(750) → expected 0
    Test 3: delivery(450) → expected 40
37. 37.True or false: “tiny tap areas” makes the app harder to use. (a) False (b) True
38. 38.True or false: a date picker is data. (a) True (b) False
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 210; // typed by the user
    line 2: let off = 20; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 4 (c) line 3 (d) line 2
40. 40.Which of these is an input? (a) a pop-up message (b) taking a photo (c) adding up a bill (d) a buzz (vibration)

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