App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 317 · 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.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let stars = 44; // start at 44
   line 2: stars = stars + 4; // add 4
   line 3: stars = stars + 1; // take away 1
   line 4: show(stars); // show it
2. 2.💡 Does an app idea like a bill splitter solve a real problem? (a) No (b) Yes
3. 3.🧪 What is the ACTUAL result of Test 1?
   🚚 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(600) → expected 0
   Test 2: delivery(550) → expected 0
   Test 3: delivery(450) → expected 40
4. 4.🧪 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(7) → expected 50
   Test 2: price(8) → expected 100
   Test 3: price(11) → expected 100 (a) Test 2 (b) Test 1 (c) Test 3
5. 5.🔀 What number does this shop app show?
   let total = 660;
   if (total > 500) {
     total = total - 50;
   }
   show(total);
6. 6.Which of these is data? (a) tap to Save (b) your saved notes (c) the game-over page (d) a switch for dark mode
7. 7.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let score = 34; // start at 34
   line 2: score = score - 1; // take away 1
   line 3: score = score + 2; // double it
   line 4: show(score); // show it (a) line 1 (b) line 3 (c) line 2
8. 8.Which of these makes the app harder to use? (a) captions on videos (b) text that can grow (c) labels on every icon (d) tiny tap areas
9. 9.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) pick a theme colour (b) share tasks to friends (c) earn stickers (d) add a homework task
10. 10.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(2) + points(0));
11. 11.🐞 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 - 3; // take away 3
    line 3: stars = stars + 3; // take away 3
    line 4: stars = stars - 3; // take away 3
    line 5: show(stars); // show it (a) line 3 (b) line 1 (c) line 2 (d) line 4
12. 12.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Title: 16 px
    Label: 25 px
    Body text: 28 px
    Menu: 9 px (a) Label (b) Title (c) Menu (d) Body text
13. 13.🗂️ What kind of app is a calculator? (a) a learning app (b) a health app (c) a tool app (d) a game
14. 14.🧪 Who else should try an app before release? (a) the app icon (b) only the coder (c) real users (d) nobody
15. 15.🔐 Is this permission request fair or too much: voice notes → microphone? (a) fair (b) too much
16. 16.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) on the phone (b) in the cloud
17. 17.🧰 What does this code show?
    function greet(name) {
      return "Hi, " + name + "!";
    }
    show(greet("Riya")); (a) Hi, Riya! (b) Hi, name! (c) Riya (d) greet
18. 18.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) in the cloud (b) on the phone
19. 19.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) set a due date (b) add a homework task (c) earn stickers (d) see tasks by day
20. 20.🧩 In an app, what is your friends list? (a) a screen (b) a button (c) an input (d) data
21. 21.True or false: a homework planner is the best fit for a reader who finds small print hard. (a) True (b) False
22. 22.👥 A school app has 115 students, 185 teachers and 300 parents as users. How many more parents than teachers are there?
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 72 px tall
    Help button: 48 px tall
    Done button: 44 px tall
    Next button: 48 px tall (a) Cancel (b) Done (c) Help (d) Next
24. 24.🗂️ What kind of app is an alarm clock? (a) a health app (b) a learning app (c) a tool app (d) a game
25. 25.🔐 Which permission does a walking map really need? (a) contacts (b) the camera (c) location (d) the microphone
26. 26.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(55, 5));
27. 27.♿ What does a screen reader do? (a) makes text tiny (b) takes photos (c) reads the screen aloud (d) plays music
28. 28.🧩 Which input is best for choosing a volume level? (a) a slider (b) a text box (c) a title (d) a switch
29. 29.♿ A screen has 10 icon buttons. Only 4 of them have a text label for screen readers. How many still need a label?
30. 30.👆 The user taps the button 6 times. What number does the label show now?
    let points = 4;
    button.onTap = function () {
      points = points + 1;
      label.text = points;
    };
31. 31.🧪 What is the ACTUAL result of Test 2?
    🎟️ Rule: a ticket costs 50 for children under 13, and 100 for everyone else.
    function price(age) {
      if (age < 13) {
        return 50;
      }
      return 100;
    }
    Test 1: price(19) → expected 100
    Test 2: price(13) → expected 100
    Test 3: price(10) → expected 50
32. 32.🧰 What is a function? (a) a screen size (b) a list of colours (c) a named block of code (d) a type of phone
33. 33.Which of these is true of an app? (a) has a web address (b) needs no installing (c) opens from a link (d) updates from the store
34. 34.🎯 Which app would help this user most: a child saving up for a cycle? (a) a recipe finder (b) a big-text reader (c) a water reminder (d) a pocket-money tracker
35. 35.👆 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
36. 36.🔐 Which permission does a weather-near-me app really need? (a) the camera (b) contacts (c) location (d) the microphone
37. 37.🔁 What is the LAST line this code shows?
    let names = ["Riya", "Aman", "Kabir"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Riya (b) Hi, Kabir (c) Hi, Aman
38. 38.🚀 Which version is newer: 3.5.0 or 3.11.2? (a) 3.11.2 (b) 3.5.0
39. 39.🎨 UI stands for user ___. (a) idea (b) input (c) interface (d) internet
40. 40.🎯 Why learn about users before you build? (a) to slow it down (b) to make it longer (c) to pick a logo (d) to build what they need

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