App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 476 · 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.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let lives = 40; // start at 39
   line 2: lives = lives * 2; // double it
   line 3: lives = lives - 5; // take away 5
   line 4: show(lives); // show it (a) line 3 (b) line 2 (c) line 1
2. 2.Which of these happens at the build stage? (a) connect the data (b) spot a problem to solve (c) write the store text (d) draw the user flow
3. 3.🔢 In a food-order flow, which comes first: “track the order” or “add it to the cart”? (a) track the order (b) add it to the cart
4. 4.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
   Footer: 11 px
   Label: 12 px
   Title: 14 px
   Menu: 14 px
5. 5.🔐 Which permission does a voice recorder really need? (a) the microphone (b) the camera (c) location (d) contacts
6. 6.💡 Does an app idea like a lost-and-found board solve a real problem? (a) Yes (b) No
7. 7.🗒️ Version 1 of a water reminder must be ready in 6 days. How many days are left for extras after the must-haves?
   set a reminder time: 1 days
   log a glass of water: 1 days
   see today’s total: 4 days
8. 8.🔁 What number does this code show?
   let runs = [4, 20, 5];
   let total = 0;
   for (let i = 0; i < runs.length; i++) {
     total = total + runs[i];
   }
   show(total);
9. 9.True or false: a torch is a game. (a) False (b) True
10. 10.🗒️ Why keep version 1 small? (a) to use up storage (b) to confuse users (c) to look bigger (d) to learn from users soon
11. 11.🚀 In version 2.5.1, which number is the major version? (a) 5 (b) 1 (c) 251 (d) 2
12. 12.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Hint: 23 px
    Body text: 15 px
    Menu: 20 px
13. 13.✏️ Do wireframes usually show the final colours? (a) No (b) Yes
14. 14.👆 What kind of event is this: the user presses Save? (a) a load event (b) a text event (c) a timer event (d) a tap event
15. 15.Which of these is about UI (the look)? (a) how fast a task is done (b) how easy sign-up is (c) the icon shapes (d) whether users get lost
16. 16.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Caption: 17 px
    Hint: 24 px
    Footer: 11 px
    Title: 27 px
    Body text: 19 px (a) Hint (b) Footer (c) Caption (d) Title
17. 17.Which of these is true of a website? (a) is installed on a phone (b) comes from an app store (c) updates from the store (d) opens from a link
18. 18.🔐 A torch app asks for your contacts. What should you do? (a) share them all (b) allow it (c) post them online (d) deny it
19. 19.🔍 Which is the odd one out? (a) write the code (b) spot a problem to solve (c) talk to possible users (d) list what users need
20. 20.True or false: a voice recorder needs the microphone. (a) False (b) True
21. 21.🎨 A beautiful app that confuses everyone has ___. (a) good UI but poor UX (b) no UI at all (c) good UX but poor UI (d) perfect UX
22. 22.📱 Which one has a web address: an app or a website? (a) a website (b) an app
23. 23.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 38; // start at 38
    line 2: coins = coins + 3; // add 3
    line 3: coins = coins + 2; // take away 2
    line 4: coins = coins - 1; // take away 1
    line 5: show(coins); // show it
24. 24.🧪 What is the ACTUAL result of Test 3?
    🎟️ Rule: a ticket costs 50 for children under 8, and 100 for everyone else.
    function price(age) {
      if (age < 8) {
        return 50;
      }
      return 100;
    }
    Test 1: price(11) → expected 100
    Test 2: price(12) → expected 100
    Test 3: price(6) → expected 50
25. 25.🎯 What is the best first step to learn what users need? (a) pick the colours (b) write the code (c) guess on your own (d) ask and watch users
26. 26.True or false: tap to go Next is a button. (a) True (b) False
27. 27.🔘 Our rule: buttons are at least 48 px tall. The Done button is 28 px tall. How many px taller must it be?
28. 28.🐞 What is a good first step when an app gives a wrong result? (a) delete the app (b) buy a new phone (c) find where it goes wrong (d) add more colours
29. 29.🔍 Which is the odd one out? (a) a result on screen (b) a buzz (vibration) (c) a beep sound (d) typing your age
30. 30.Which of these makes the app harder to use? (a) captions on videos (b) strong colour contrast (c) text that can grow (d) tiny tap areas
31. 31.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Edit Profile
    [switch] Show hints
    [slider] Volume
    [button] Send
    [text box] Notes
    [button] Help
    [button] Done
32. 32.👆 The user taps the button 3 times. What number does the label show now?
    let stars = 3;
    button.onTap = function () {
      stars = stars + 4;
      label.text = stars;
    };
33. 33.🔢 After an app is released, what comes right after “read user reviews”? (a) release an update (b) test it again (c) list what to fix (d) fix and improve
34. 34.🔁 Why use a loop to show 100 messages? (a) less code to write (b) it is slower (c) it hides them (d) it uses more lines
35. 35.⚙️ What number does this app show?
    let km = 4; // typed by the user
    let metres = km * 1000;
    show(metres);
36. 36.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
37. 37.⚙️ What number does this app show?
    let km = 8; // typed by the user
    let metres = km * 1000;
    show(metres);
38. 38.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 40;
    }
    show(fee(1) + fee(4));
39. 39.🗂️ What kind of app is a puzzle with levels? (a) a game (b) a tool app (c) a health app (d) a learning app
40. 40.💡 Does an app idea like an app that just says hi solve a real problem? (a) No (b) Yes

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