App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 280 · 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.✏️ Why draw a wireframe before coding? (a) it saves data (b) it adds colours (c) it runs the app (d) changes are quick
2. 2.🔁 What number does this code show?
   let runs = [25, 27, 68, 68];
   let count = 0;
   for (let i = 0; i < runs.length; i++) {
     if (runs[i] >= 70) {
       count = count + 1;
     }
   }
   show(count);
3. 3.🔁 What number does this code show?
   let scores = [3, 13, 5, 9, 5];
   let total = 0;
   for (let i = 0; i < scores.length; i++) {
     total = total + scores[i];
   }
   show(total);
4. 4.🔁 list.length tells you ___. (a) the biggest item (b) the last item (c) the first item (d) how many items it has
5. 5.🧪 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(500) → expected 0
   Test 2: delivery(250) → expected 40
   Test 3: delivery(400) → expected 0
6. 6.🧰 What does this code show?
   function greet(name) {
     return "Hi, " + name + "!";
   }
   show(greet("Meera")); (a) Hi, name! (b) greet (c) Hi, Meera! (d) Meera
7. 7.♿ A screen has 5 icon buttons. Only 1 of them have a text label for screen readers. How many still need a label?
8. 8.👆 The user types Zoya in nameBox and taps the button 1 time. What does the label show?
   button.onTap = function () {
     label.text = "Hello, " + nameBox.text + "!";
   }; (a) Hello! (b) Zoya (c) Hello, Zoya! (d) Hello, nameBox.text!
9. 9.Which of these is about UI (the look)? (a) how users feel after (b) how easy sign-up is (c) the screen layout (d) how many taps it takes
10. 10.🎯 Is this a user need or a feature: a reminder alarm? (a) a user need (b) a feature
11. 11.💡 Does an app idea like a free study-room finder solve a real problem? (a) No (b) Yes
12. 12.📊 Survey: which problem bugs you most? How many more votes did “no quiet study place” get than “forgetting homework”?
    forgetting homework: 12 votes
    losing water bottles: 4 votes
    no quiet study place: 25 votes
13. 13.🔁 What number does this code show?
    let scores = [13, 15, 6];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
14. 14.🔍 Which is the odd one out? (a) a racing challenge (b) a word battle (c) a cricket run chase (d) a times-table quiz
15. 15.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Menu: 18 px
    Hint: 21 px
    Footer: 20 px
16. 16.🗒️ You are planning version 1 of a pocket-money tracker. Which feature can WAIT for a later version? (a) add money received (b) show the balance (c) pie-chart colours (d) add money spent
17. 17.🧪 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(11) → expected 100
    Test 2: price(9) → expected 50
    Test 3: price(13) → expected 100
18. 18.True or false: a unit converter is a tool app. (a) False (b) True
19. 19.👆 What kind of event is this: one second passes? (a) a load event (b) a tap event (c) a timer event (d) a text event
20. 20.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let score = 36; // start at 36
    line 2: score = score + 2; // double it
    line 3: score = score * 2; // double it
    line 4: score = score * 2; // double it
    line 5: show(score); // show it
21. 21.🚀 Your app is at version 3.11.2. The next release fixes a small bug. What is its version number? (a) 3.12.2 (b) 3.11.3 (c) 3.12.0 (d) 4.0.0
22. 22.Which of these is an input? (a) a buzz (vibration) (b) sorting the scores (c) a result on screen (d) speaking a command
23. 23.👆 The user taps the button 3 times. What number does the label show now?
    let points = 10;
    button.onTap = function () {
      points = points + 2;
      label.text = points;
    };
24. 24.🔢 In a photo-post flow, what comes right after “open the camera screen”? (a) take the photo (b) post the photo (c) write a caption (d) add a filter
25. 25.♿ A screen has 8 icon buttons. Only 3 of them have a text label for screen readers. How many still need a label?
26. 26.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Footer: 18 px
    Hint: 10 px
    Menu: 21 px
    Label: 16 px
27. 27.True or false: a lost-and-found board solves no real problem. (a) False (b) True
28. 28.🗒️ What is a must-have feature? (a) a colour theme (b) one the app cannot skip (c) a nice extra (d) a sound effect
29. 29.👆 Two designs for the same task (each arrow is one tap). How many taps does Design B need?
    Design A: Home → Pay → Shop → Pens → Address → Cart → Search
    Design B: Home → Pens → Address → Shop
30. 30.🗒️ Version 1 of a bus tracker must be ready in 7 days. How many days are left for extras after the must-haves?
    see where the bus is: 3 days
    show arrival time: 1 days
    pick your bus stop: 3 days
31. 31.True or false: notes to read offline fits saving in the cloud. (a) True (b) False
32. 32.👆 The user taps the button 2 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) OFF (b) ON
33. 33.🎨 Is this about UI or UX: the icon shapes? (a) UX (b) UI
34. 34.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Maths", "Music"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Maths (b) Music (c) Science
35. 35.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let coins = 31; // start at 31
    line 2: coins = coins * 2; // double it
    line 3: coins = coins + 1; // take away 1
    line 4: coins = coins - 5; // take away 5
    line 5: show(coins); // show it
36. 36.📅 An app team plans for 5 days, builds for 8 days, tests for 1 days and releases on 1 more day. Planning starts on day 1. On which day does building finish?
37. 37.👥 A school app has 175 students, 290 teachers and 135 parents as users. How many users does it have in all?
38. 38.🔍 Which is the odd one out? (a) sketch the screens (b) pick the features (c) draw the user flow (d) share the download link
39. 39.🔀 What does this battery rule show?
    let battery = 4;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
40. 40.🧪 A test case is an input together with its ___. (a) app icon (b) font size (c) screen colour (d) expected result

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