App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 907 · 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 stars = 41; // start at 41
   line 2: stars = stars - 5; // add 5
   line 3: stars = stars - 2; // take away 2
   line 4: stars = stars + 2; // add 2
   line 5: show(stars); // show it (a) line 3 (b) line 2 (c) line 4 (d) line 1
2. 2.🧩 In an app, what is tap to Send? (a) a screen (b) an input (c) data (d) a button
3. 3.👆 The user taps the button 6 times. What number does the label show now?
   let coins = 2;
   button.onTap = function () {
     coins = coins + 4;
     label.text = coins;
   };
4. 4.🗒️ Version 1 of a homework planner must be ready in 11 days. How many days are left for extras after the must-haves?
   add a homework task: 1 days
   set a due date: 4 days
   see tasks by day: 2 days
5. 5.👥 A clinic app has 25 patients, 95 doctors and 130 nurses as users. Which user group is the biggest? (a) nurses (b) doctors (c) patients
6. 6.🔁 A loop over a list of 5 items runs its body how many times? (a) 6 (b) 1 (c) 5 (d) 4
7. 7.🔁 What number does this code show?
   let runs = [59, 36, 36, 37];
   let count = 0;
   for (let i = 0; i < runs.length; i++) {
     if (runs[i] >= 60) {
       count = count + 1;
     }
   }
   show(count);
8. 8.🔐 Which permission does a barcode scanner really need? (a) the microphone (b) location (c) contacts (d) the camera
9. 9.♿ Does this help everyone, or make the app harder to use: labels on every icon? (a) helps everyone (b) makes it harder
10. 10.🔢 When you make an app, which comes first: “plan the screens” or “get an idea”? (a) plan the screens (b) get an idea
11. 11.🔁 Why use a loop to show 100 messages? (a) it uses more lines (b) it is slower (c) less code to write (d) it hides them
12. 12.🔁 What number does this code show?
    let marks = [63, 12, 20, 94];
    let count = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] >= 50) {
        count = count + 1;
      }
    }
    show(count);
13. 13.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let coins = 35; // start at 35
    line 2: coins = coins - 2; // take away 2
    line 3: coins = coins * 3; // double it
    line 4: show(coins); // show it (a) line 3 (b) line 1 (c) line 2
14. 14.🔢 After an app is released, what comes right after “list what to fix”? (a) release an update (b) test it again (c) read user reviews (d) fix and improve
15. 15.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Score card”
    2. tap the Profile tab
    3. open “Match report”
    4. tap Back
    5. open “Friend list”
    How many times must you tap Back to reach the main screen of this tab?
16. 16.⚙️ 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 4 (d) line 3
17. 17.🧩 Which of these is a button on this screen?
    [title] Add Homework
    [button] Start
    [text box] Age
    [switch] Sound
    [button] Back
    [button] Cancel
    [text box] Email (a) Email (b) Back (c) Sound (d) Age
18. 18.🔀 What does this sign-up rule show?
    let age = 14;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Ask a parent (b) Welcome!
19. 19.🔀 Which badge does this quiz app show?
    let marks = 94;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Bronze (b) Gold (c) Silver
20. 20.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Item → Pay → Search → Results → Size
    Design B: Home → Pens → Cart → Size → Shop
21. 21.🔁 What number does this code show?
    let scores = [1, 13, 13];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
22. 22.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Item → Address
    Design B: Home → Confirm → Address → Item → Cart → Menu → Size (a) Design B (b) Design A
23. 23.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ menu icon ]
    [ list of items ]
    [ Save button ]
    [ filter buttons ]
    [ top bar ] (a) filter buttons (b) top bar (c) list of items (d) Save button
24. 24.🧩 Which of these is a button on this screen?
    [title] Sign Up
    [switch] Dark mode
    [button] Done
    [slider] Volume
    [text box] City (a) Done (b) Dark mode (c) City (d) Volume
25. 25.Which of these happens at the build stage? (a) add the buttons (b) sketch the screens (c) spot a problem to solve (d) write down the bugs
26. 26.✏️ Is this true of a wireframe or of a final design: has no real colours? (a) a final design (b) a wireframe
27. 27.👆 What kind of event is this: the user types a letter? (a) a text event (b) a timer event (c) a load event (d) a tap event
28. 28.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 36 px tall
    Save button: 60 px tall
    Back button: 40 px tall
29. 29.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Friend list”
    2. open “Map”
    3. tap the Profile tab
    4. tap the Profile tab
    5. tap the Search tab
    How many times must you tap Back to reach the main screen of this tab?
30. 30.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 34; // start at 32
    line 2: stars = stars * 2; // double it
    line 3: stars = stars + 3; // add 3
    line 4: show(stars); // show it
31. 31.🚀 Which version is newer: 3.5.1 or 3.18.2? (a) 3.18.2 (b) 3.5.1
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 57; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 3 (b) line 4 (c) line 1 (d) line 2
33. 33.🚀 Which version is newer: 1.8.15 or 1.8.9? (a) 1.8.9 (b) 1.8.15
34. 34.🔁 What number does this code show?
    let scores = [80, 39, 58];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 60) {
        count = count + 1;
      }
    }
    show(count);
35. 35.Which of these is a user need? (a) a reminder alarm (b) a search bar (c) a dark mode switch (d) “I forget my homework”
36. 36.👆 What kind of event is this: the search box changes? (a) a timer event (b) a tap event (c) a text event (d) a load event
37. 37.🔀 In a good flow, each screen should lead to ___. (a) a clear next step (b) a dead end (c) a random page (d) the same screen
38. 38.📱 Which one is installed on a phone: an app or a website? (a) a website (b) an app
39. 39.👥 A library app has 85 readers, 60 librarians and 120 volunteers as users. How many more volunteers than readers are there?
40. 40.🧪 What is the ACTUAL result of Test 3?
    🎟️ Rule: a ticket costs 50 for children under 11, and 100 for everyone else.
    function price(age) {
      if (age < 11) {
        return 50;
      }
      return 100;
    }
    Test 1: price(13) → expected 100
    Test 2: price(12) → expected 100
    Test 3: price(8) → expected 50

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