App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 519 · 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.Which of these requests is fair? (a) torch → contacts (b) calculator → location (c) quiz app → microphone (d) calling app → contacts
2. 2.Which of these is a user need? (a) a dark mode switch (b) a share button (c) a search bar (d) “I keep missing the bus”
3. 3.🔢 In a sign-up flow, what comes right after “enter the code sent”? (a) open the app (b) type name and email (c) tap “Sign up” (d) see the home screen
4. 4.Which of these is a button? (a) the game-over page (b) your friends list (c) tap to go Next (d) today’s step count
5. 5.👆 The user taps the button 2 times. What number does the label show now?
   let stars = 2;
   button.onTap = function () {
     stars = stars + 3;
     label.text = stars;
   };
6. 6.🔁 A loop over a list of 5 items runs its body how many times? (a) 6 (b) 1 (c) 4 (d) 5
7. 7.🧩 Which input is best for typing your name? (a) a slider (b) a switch (c) a picture (d) a text box
8. 8.🧪 One test case fails. Which one?
   🚚 Rule: delivery is free (0) when the order is 500 or more; otherwise it costs 40.
   function delivery(total) {
     if (total > 500) {
       return 0;
     }
     return 40;
   }
   Test 1: delivery(500) → expected 0
   Test 2: delivery(600) → expected 0
   Test 3: delivery(350) → expected 40 (a) Test 1 (b) Test 2 (c) Test 3
9. 9.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let coins = 38; // start at 38
   line 2: coins = coins + 6; // add 6
   line 3: coins = coins - 2; // add 2
   line 4: show(coins); // show it (a) line 2 (b) line 3 (c) line 1
10. 10.🧪 How many of these test cases pass?
    🚚 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(450) → expected 0
    Test 2: delivery(500) → expected 0
    Test 3: delivery(250) → expected 40
11. 11.♿ Does this help everyone, or make the app harder to use: captions on videos? (a) helps everyone (b) makes it harder
12. 12.👆 The user taps the button 3 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
13. 13.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
14. 14.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Menu: 15 px
    Title: 13 px
    Body text: 20 px
    Footer: 17 px
    Hint: 12 px
15. 15.🔀 What does this PIN rule show?
    let pin = "3039";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) Use 4 digits (b) PIN saved
16. 16.👥 A school app has 115 students, 175 teachers and 220 parents as users. How many more parents than teachers are there?
17. 17.🧭 Which part of navigation hides extra links? (a) a tab bar (b) the back button (c) a menu button
18. 18.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(95, 4));
19. 19.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) the button colours (b) how fast a task is done (c) the theme colours (d) the icon shapes
21. 21.🔁 What number does this code show?
    let scores = [12, 1, 1, 4];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
22. 22.👥 A clinic app has 40 patients, 140 doctors and 250 nurses as users. Which user group is the biggest? (a) patients (b) nurses (c) doctors
23. 23.👥 A clinic app has 80 patients, 165 doctors and 20 nurses as users. How many users does it have in all?
24. 24.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) pick your bus stop (b) show arrival time (c) change the bus icon (d) see where the bus is
25. 25.True or false: the icon shapes is about UX (the experience). (a) True (b) False
26. 26.🔁 What number does this code show?
    let steps = [1, 5, 11];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
27. 27.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
28. 28.True or false: the button colours is about UX (the experience). (a) True (b) False
29. 29.True or false: a torch is a learning app. (a) False (b) True
30. 30.👆 The user types Kabir in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Welcome, " + nameBox.text + "!";
    }; (a) Welcome! (b) Kabir (c) Welcome, Kabir! (d) Welcome, nameBox.text!
31. 31.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Score card”
    2. tap the Lessons tab
    3. open “Video”
    4. tap Back
    5. open “Video”
    Which screen are you on now? (a) Score card (b) Quiz (c) Video (d) Lessons
32. 32.🎨 Is this about UI or UX: how fast a task is done? (a) UX (b) UI
33. 33.True or false: today’s step count is an input. (a) True (b) False
34. 34.🎨 Is this about UI or UX: the button colours? (a) UI (b) UX
35. 35.🧩 Which of these is a button on this screen?
    [title] Sign Up
    [button] Save
    [text box] Phone
    [slider] Volume (a) Volume (b) Save (c) Phone
36. 36.Which of these is an output? (a) tapping a button (b) working out a tip (c) taking a photo (d) a buzz (vibration)
37. 37.Which of these fits saving on the phone? (a) notes to read offline (b) a class leaderboard (c) a shared to-do list (d) photos on two devices
38. 38.💡 Does an app idea like a free study-room finder solve a real problem? (a) Yes (b) No
39. 39.True or false: a medicine reminder solves no real problem. (a) True (b) False
40. 40.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) never need a password (c) skip the internet (d) shrink the app

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