App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 276 · 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.🖼️ How many parts (boxes) does this wireframe have?
   [ Add button ]
   [ tab bar ]
   [ filter buttons ]
   [ list of items ]
   [ search box ]
2. 2.♿ Does this help everyone, or make the app harder to use: sudden loud sounds? (a) makes it harder (b) helps everyone
3. 3.Which of these is true of an app? (a) opens in a web browser (b) opens from a link (c) needs no installing (d) updates from the store
4. 4.💾 Which can hold many values in order? (a) a single number (b) a switch (c) a list (d) a button
5. 5.🔁 What does a loop do? (a) repeats code (b) deletes code (c) saves photos (d) draws icons
6. 6.🗒️ You are planning version 1 of a bus tracker. Which feature is a MUST-HAVE? (a) rate the driver (b) change the bus icon (c) show arrival time (d) a dark mode
7. 7.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let coins = 34; // start at 34
   line 2: coins = coins * 2; // double it
   line 3: coins = coins * 2; // double it
   line 4: coins = coins * 3; // double it
   line 5: show(coins); // show it (a) line 4 (b) line 3 (c) line 2 (d) line 1
8. 8.🗒️ You are planning version 1 of a quiz app. Which feature is a MUST-HAVE? (a) an avatar shop (b) background music (c) confetti effects (d) check the answer
9. 9.🔁 Why use a loop to show 100 messages? (a) less code to write (b) it is slower (c) it uses more lines (d) it hides them
10. 10.True or false: how users feel after is about UX (the experience). (a) True (b) False
11. 11.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
12. 12.🧭 Where is a tab bar usually placed in a phone app? (a) in the middle (b) inside a button (c) nowhere (d) at the bottom
13. 13.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let points = 44; // start at 44
    line 2: points = points * 2; // double it
    line 3: points = points * 3; // double it
    line 4: show(points); // show it
14. 14.Which of these app ideas solves no real problem? (a) a library due-date alert (b) a lost-and-found board (c) a bill splitter (d) an app that just says hi
15. 15.🔀 In a good flow, each screen should lead to ___. (a) the same screen (b) a random page (c) a dead end (d) a clear next step
16. 16.🔢 In a sign-up flow, which comes first: “tap “Sign up”” or “make a password”? (a) make a password (b) tap “Sign up”
17. 17.🧪 One test case fails. Which one?
    🎟️ 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(8) → expected 100
    Test 2: price(9) → expected 100
    Test 3: price(7) → expected 50 (a) Test 3 (b) Test 2 (c) Test 1
18. 18.♿ Does this help everyone, or make the app harder to use: captions on videos? (a) helps everyone (b) makes it harder
19. 19.True or false: a medicine reminder solves no real problem. (a) True (b) False
20. 20.🧰 What is a function? (a) a list of colours (b) a screen size (c) a type of phone (d) a named block of code
21. 21.Which of these requests is fair? (a) torch → contacts (b) timer → your photos (c) calculator → location (d) map app → location
22. 22.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ search box ]
    [ top bar ]
    [ list of items ]
    [ menu icon ] (a) list of items (b) menu icon (c) search box (d) top bar
23. 23.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(60, 4));
24. 24.🔀 What does this PIN rule show?
    let pin = "965";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
25. 25.🔁 What number does this code show?
    let marks = [11, 13, 12, 3];
    let best = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] > best) {
        best = marks[i];
      }
    }
    show(best);
26. 26.True or false: a water reminder is a health app. (a) True (b) False
27. 27.True or false: a homework planner is the best fit for a student who often misses the school bus. (a) True (b) False
28. 28.🔀 What does this battery rule show?
    let battery = 8;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
29. 29.👥 A cricket club app has 40 players, 50 coaches and 250 fans as users. Which user group is the biggest? (a) coaches (b) players (c) fans
30. 30.🔢 In a sign-up flow, which comes FIRST? (a) tap “Sign up” (b) enter the code sent (c) make a password (d) open the app
31. 31.🔍 Which is the odd one out? (a) draw the user flow (b) write the store text (c) pick the features (d) sketch the screens
32. 32.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Caption: 10 px
    Body text: 18 px
    Title: 28 px (a) Body text (b) Caption (c) Title
33. 33.True or false: you write the store text at the release stage. (a) False (b) True
34. 34.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 9, and 100 for everyone else.
    function price(age) {
      if (age <= 9) {
        return 50;
      }
      return 100;
    }
    Test 1: price(15) → expected 100
    Test 2: price(7) → expected 50
    Test 3: price(9) → expected 100
35. 35.🗒️ Version 1 of a homework planner must be ready in 9 days. How many days are left for extras after the must-haves?
    add a homework task: 1 days
    set a due date: 3 days
    see tasks by day: 5 days
36. 36.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 30;
    }
    show(fee(7) + fee(2));
37. 37.💡 Does an app idea like a blank grey screen solve a real problem? (a) Yes (b) No
38. 38.True or false: a big, easy tap area is good button design. (a) True (b) False
39. 39.🛠️ At which stage do you list what users need? (a) the build stage (b) the plan stage (c) the release stage (d) the idea stage
40. 40.🐞 Finding and fixing bugs is called ___. (a) designing (b) downloading (c) debugging (d) decorating

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