App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 170 · 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.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
   1. open “Video”
   2. tap the Me tab
   3. open “Friend list”
   4. tap Back
   Which screen are you on now? (a) Video (b) Lessons (c) Friend list (d) Me
2. 2.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let lives = 30; // start at 30
   line 2: lives = lives * 3; // double it
   line 3: lives = lives + 4; // add 4
   line 4: show(lives); // show it (a) line 1 (b) line 2 (c) line 3
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 540; // 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 2 (b) line 1 (c) line 3 (d) line 4
4. 4.🚀 A change from version 1.4.2 to 1.4.3 usually means ___. (a) a big redesign (b) a new app (c) a bug fix (d) a new feature
5. 5.⚙️ What number does this app show?
   let km = 9; // typed by the user
   let metres = km * 1000;
   show(metres);
6. 6.👆 The user taps the button 6 times. What number does the label show now?
   let score = 3;
   button.onTap = function () {
     score = score + 1;
     label.text = score;
   };
7. 7.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
   Design A: Home → Confirm → Size → Search → Item → Menu → Offers
   Design B: Home → Address → Offers → Results (a) Design A (b) Design B
8. 8.🔁 What does a loop do? (a) saves photos (b) repeats code (c) deletes code (d) draws icons
9. 9.👥 A clinic app has 250 patients, 180 doctors and 220 nurses as users. How many users does it have in all?
10. 10.🔍 Which is the odd one out? (a) a times-table quiz (b) a racing challenge (c) a puzzle with levels (d) a cricket run chase
11. 11.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Settings
    [button] Save
    [text box] Name
    [button] Send
12. 12.🎯 Which app would help this user most: a student who often misses the school bus? (a) a bus tracker (b) a homework planner (c) a water reminder (d) a recipe finder
13. 13.👆 The user taps the button 8 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 3) {
        likes = likes + 1;
      }
      label.text = likes;
    };
14. 14.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 44; // start at 44
    line 2: coins = coins - 5; // add 5
    line 3: coins = coins * 2; // double it
    line 4: coins = coins * 2; // double it
    line 5: show(coins); // show it
15. 15.🗂️ What kind of app is a racing challenge? (a) a health app (b) a tool app (c) a game (d) a learning app
16. 16.Which of these is a user need? (a) a share button (b) “I keep missing the bus” (c) a search bar (d) a dark mode switch
17. 17.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Hint: 10 px
    Title: 22 px
    Footer: 23 px
    Body text: 17 px
18. 18.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) show arrival time (b) see where the bus is (c) pick your bus stop (d) a dark mode
19. 19.🔐 Which permission does a bus tracker really need? (a) the camera (b) location (c) contacts (d) the microphone
20. 20.🛠️ At which stage do you try every button? (a) the build stage (b) the plan stage (c) the idea stage (d) the test stage
21. 21.✏️ Why draw a wireframe before coding? (a) it adds colours (b) it runs the app (c) changes are quick (d) it saves data
22. 22.🧩 What do we call one full page of an app? (a) a screen (b) a cable (c) a variable (d) a battery
23. 23.🔀 A screen with no way forward or back is called a ___. (a) home screen (b) tab bar (c) dead end (d) shortcut
24. 24.🧪 What is the ACTUAL result of Test 3?
    🎟️ Rule: a ticket costs 50 for children under 13, and 100 for everyone else.
    function price(age) {
      if (age <= 13) {
        return 50;
      }
      return 100;
    }
    Test 1: price(20) → expected 100
    Test 2: price(11) → expected 50
    Test 3: price(19) → expected 100
25. 25.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) see today’s total (b) set a reminder time (c) water animations (d) log a glass of water
26. 26.🔍 Which is the odd one out? (a) big touch targets (b) captions on videos (c) strong colour contrast (d) colour as the only clue
27. 27.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 33; // start at 33
    line 2: stars = stars - 2; // take away 2
    line 3: stars = stars - 5; // add 5
    line 4: show(stars); // show it
28. 28.🧭 Which part of navigation goes to the last screen? (a) the back button (b) a tab bar (c) a menu button
29. 29.🔢 After an app is released, which comes LAST? (a) read user reviews (b) list what to fix (c) release an update (d) fix and improve
30. 30.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Order Snacks
    [button] Done
    [slider] Text size
    [text box] Email
31. 31.Which of these is a screen? (a) a box to type a name (b) a slider for volume (c) your friends list (d) the settings page
32. 32.👆 Two designs for the same task (each arrow is one tap). How many taps does Design B need?
    Design A: Home → Search → Shop → Pay → Size
    Design B: Home → Offers → Pens → Results → Search → Confirm
33. 33.True or false: a class leaderboard fits saving in the cloud. (a) True (b) False
34. 34.True or false: a pocket-money tracker is the best fit for a teen learning to make snacks. (a) True (b) False
35. 35.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
36. 36.🧪 What is the ACTUAL result of Test 2?
    🚚 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(300) → expected 40
37. 37.👆 The user taps the button 7 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
38. 38.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting birthdays: 5 votes
    wasting pocket money: 7 votes
    forgetting homework: 20 votes (a) wasting pocket money (b) forgetting homework (c) forgetting birthdays
39. 39.🔁 What number does this code show?
    let scores = [11, 5, 7, 2];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
40. 40.📊 Survey: which problem bugs you most? How many students voted in all?
    forgetting homework: 23 votes
    no quiet study place: 24 votes
    wasting pocket money: 16 votes

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