App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 538 · 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.🐞 A comment in code (after //) is for ___. (a) the phone screen (b) the battery (c) people reading the code (d) the app store
2. 2.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
   Body text: 18 px
   Hint: 11 px
   Title: 21 px
   Caption: 19 px
3. 3.🔀 What does >= mean? (a) not equal (b) less than (c) smaller or equal (d) greater than or equal
4. 4.True or false: a final design has the real colours. (a) True (b) False
5. 5.💾 Data saved only on the phone is lost when ___. (a) the screen turns off (b) the app is closed (c) you send a message (d) the phone is lost
6. 6.📊 Survey: which problem bugs you most? Which problem should your app solve first?
   missing the bus: 5 votes
   no quiet study place: 4 votes
   wasting pocket money: 10 votes (a) missing the bus (b) no quiet study place (c) wasting pocket money
7. 7.Which of these is true of the back button? (a) goes to the last screen (b) hides extra links (c) switches main sections (d) shows 3 to 5 icons
8. 8.📱 Which one opens from a link: an app or a website? (a) a website (b) an app
9. 9.🚀 Which version is newer: 1.1.6 or 1.1.13? (a) 1.1.6 (b) 1.1.13
10. 10.🐞 What is a good first step when an app gives a wrong result? (a) add more colours (b) find where it goes wrong (c) delete the app (d) buy a new phone
11. 11.True or false: the screen layout is about UX (the experience). (a) False (b) True
12. 12.🔢 In a quiz-app flow, what comes right after “pick an answer”? (a) read a question (b) see the final score (c) tap “Start quiz” (d) see if it is right
13. 13.True or false: whether users get lost is about UI (the look). (a) True (b) False
14. 14.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
15. 15.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Match report”
    2. tap Back
    3. tap the Search tab
    4. open “Video”
    How many times must you tap Back to reach the main screen of this tab?
16. 16.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Menu: 16 px
    Hint: 24 px
    Title: 22 px
    Label: 13 px
17. 17.🧩 In an app, what is your friends list? (a) data (b) an input (c) a screen (d) a button
18. 18.🧪 A test case is an input together with its ___. (a) font size (b) expected result (c) app icon (d) screen colour
19. 19.🔍 Which is the odd one out? (a) a flashcard trainer (b) a spelling coach (c) a times-table quiz (d) a calculator
20. 20.🔢 In a sign-up flow, which comes first: “open the app” or “enter the code sent”? (a) enter the code sent (b) open the app
21. 21.Which of these is a screen? (a) a slider for volume (b) a box to type a name (c) tap to Start (d) the home page of an app
22. 22.🔢 When you make an app, which comes first: “get an idea” or “test the app”? (a) test the app (b) get an idea
23. 23.🐞 What is a bug? (a) a mistake in the code (b) a fast phone (c) a nice icon (d) a new feature
24. 24.🔢 In a sign-up flow, what comes right after “make a password”? (a) type name and email (b) tap “Sign up” (c) see the home screen (d) enter the code sent
25. 25.True or false: the search box changes is a tap event. (a) False (b) True
26. 26.📲 What happens when you tap an app’s icon? (a) the phone charges (b) the app is deleted (c) the sound turns off (d) the app opens
27. 27.🗒️ Why keep version 1 small? (a) to learn from users soon (b) to look bigger (c) to confuse users (d) to use up storage
28. 28.🔀 What number does this shop app show?
    let total = 740;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
29. 29.Which of these makes the app harder to use? (a) tiny tap areas (b) big touch targets (c) strong colour contrast (d) labels on every icon
30. 30.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 35; // start at 35
    line 2: stars = stars + 4; // add 4
    line 3: stars = stars * 3; // double it
    line 4: show(stars); // show it (a) line 1 (b) line 2 (c) line 3
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 72 px tall
    Done button: 24 px tall
    Cancel button: 56 px tall
    Save button: 64 px tall (a) Done (b) Save (c) Cancel (d) Start
32. 32.True or false: a bus tracker needs the microphone. (a) True (b) False
33. 33.📅 An app team plans for 2 days, builds for 10 days, tests for 2 days and releases on 1 more day. How many more days does building take than testing?
34. 34.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 60;
    }
    show(fee(7) + fee(1));
35. 35.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 30; // start at 30
    line 2: score = score + 8; // add 6
    line 3: score = score + 6; // add 6
    line 4: score = score * 2; // double it
    line 5: show(score); // show it
36. 36.🧪 What is the ACTUAL result of Test 3?
    🎟️ 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(12) → expected 50
    Test 2: price(20) → expected 100
    Test 3: price(21) → expected 100
37. 37.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Video”
    2. open “Friend list”
    3. open “Score card”
    Which screen are you on now? (a) Score card (b) Friend list (c) Home (d) Video
38. 38.🔍 Which is the odd one out? (a) a unit converter (b) a calculator (c) a cricket run chase (d) an alarm clock
39. 39.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(5));
40. 40.♿ Does this help everyone, or make the app harder to use: text that can grow? (a) makes it harder (b) helps everyone

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