App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 346 · 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 of these test cases pass?
   🎟️ 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(16) → expected 100
   Test 2: price(11) → expected 100
   Test 3: price(8) → expected 50
2. 2.True or false: a wireframe has the real colours. (a) False (b) True
3. 3.📊 Survey: which problem bugs you most? How many more votes did “no quiet study place” get than “missing the bus”?
   missing the bus: 3 votes
   no quiet study place: 21 votes
   wasting pocket money: 5 votes
4. 4.Which of these is processing? (a) a beep sound (b) tapping a button (c) taking a photo (d) adding up a bill
5. 5.👆 What kind of event is this: the user types a letter? (a) a timer event (b) a tap event (c) a load event (d) a text event
6. 6.🔐 Which permission does a party-invite app for friends really need? (a) the camera (b) contacts (c) location (d) the microphone
7. 7.Which of these fits saving on the phone? (a) chat messages to friends (b) notes to read offline (c) a shared to-do list (d) photos on two devices
8. 8.Which of these is true of a final design? (a) looks like the real app (b) uses plain grey boxes (c) is a quick sketch (d) shows where things go
9. 9.💾 What number does this code show?
   let lives = 4;
   lives = lives - 2;
   lives = lives + 3;
   show(lives);
10. 10.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
11. 11.🔍 Which is the odd one out? (a) the theme colours (b) the font size (c) how fast a task is done (d) the button colours
12. 12.👆 A tap handler runs how many times if the user taps 4 times? (a) 1 (b) 4 (c) 8 (d) 0
13. 13.🔀 What does this battery rule show?
    let battery = 80;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
14. 14.🔀 What does this PIN rule show?
    let pin = "18534";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
15. 15.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 39; // start at 39
    line 2: coins = coins + 5; // add 5
    line 3: coins = coins + 3; // add 3
    line 4: coins = coins + 3; // take away 3
    line 5: show(coins); // show it
16. 16.💾 What number does this code show?
    let score = 5;
    score = score - 1;
    score = score + 5;
    show(score);
17. 17.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 40; // start at 40
    line 2: stars = stars * 2; // double it
    line 3: stars = stars - 6; // add 6
    line 4: show(stars); // show it (a) line 1 (b) line 2 (c) line 3
18. 18.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Menu: 21 px
    Hint: 17 px
    Body text: 22 px
19. 19.True or false: an app is installed on a phone. (a) True (b) False
20. 20.📅 An app team plans for 4 days, builds for 4 days, tests for 2 days and releases on 1 more day. How many more days does building take than testing?
21. 21.👆 The user taps the button 4 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 2) {
        likes = likes + 1;
      }
      label.text = likes;
    };
22. 22.📱 Which one comes from an app store: an app or a website? (a) a website (b) an app
23. 23.True or false: you share the download link at the build stage. (a) False (b) True
24. 24.🔀 What does this PIN rule show?
    let pin = "104";
    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?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(5) + points(5));
26. 26.Which of these requests is fair? (a) calculator → location (b) timer → your photos (c) calling app → contacts (d) quiz app → microphone
27. 27.🗒️ What is a must-have feature? (a) a sound effect (b) a colour theme (c) one the app cannot skip (d) a nice extra
28. 28.🔍 Which is the odd one out? (a) an alarm clock (b) a torch (c) a puzzle with levels (d) a calculator
29. 29.🧰 What does return do in a function? (a) repeats the code (b) sends back a value (c) deletes the app (d) closes the screen
30. 30.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 300 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 300) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(350) → expected 0
    Test 2: delivery(300) → expected 0
    Test 3: delivery(100) → expected 40
31. 31.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ tab bar ]
    [ filter buttons ]
    [ top bar ]
    [ menu icon ]
    [ search box ] (a) menu icon (b) tab bar (c) filter buttons (d) search box
32. 32.🔍 Which is the odd one out? (a) share the download link (b) put it on an app store (c) write the store text (d) draw the user flow
33. 33.📱 Which one has a home-screen icon: an app or a website? (a) an app (b) a website
34. 34.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 300 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 300) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(350) → expected 0
    Test 2: delivery(200) → expected 40
    Test 3: delivery(500) → expected 0
35. 35.🔀 What does this sign-up rule show?
    let age = 10;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Ask a parent (b) Welcome!
36. 36.🧩 Scores, notes and settings that an app keeps are called ___. (a) tabs (b) screens (c) buttons (d) data
37. 37.True or false: a final design has no real colours. (a) False (b) True
38. 38.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Video”
    2. open “Badges”
    3. tap the Me tab
    Which screen are you on now? (a) Badges (b) Video (c) Lessons (d) Me
39. 39.🔁 What number does this code show?
    let scores = [94, 11, 74, 86, 68];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 60) {
        count = count + 1;
      }
    }
    show(count);
40. 40.🔍 Which is the odd one out? (a) connect the data (b) add the buttons (c) share the download link (d) write the code

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