App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 909 · 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.💾 What number does this code show?
   let notes = ["Maths", "Music", "Sports"];
   notes.push("Art");
   show(notes.length);
2. 2.🧩 How many buttons does this app screen have?
   [title] Settings
   [button] Send
   [text box] Subject
   [button] Done
   [button] Cancel
   [text box] Age
3. 3.🛠️ At which stage do you spot a problem to solve? (a) the release stage (b) the idea stage (c) the plan stage (d) the build stage
4. 4.🧰 What number does this code show?
   function points(stars) {
     return stars * 10 + 5;
   }
   show(points(4) + points(2));
5. 5.🐞 This code has a bug. What number does it ACTUALLY show?
   line 1: let lives = 50; // start at 50
   line 2: lives = lives + 2; // double it
   line 3: lives = lives + 4; // add 4
   line 4: lives = lives * 2; // double it
   line 5: show(lives); // show it
6. 6.🔍 Which is the odd one out? (a) a step counter (b) a calculator (c) a sleep tracker (d) a water reminder
7. 7.🎯 Which app would help this user most: a parent waiting at the bus stop? (a) a water reminder (b) a recipe finder (c) a bus tracker (d) a pocket-money tracker
8. 8.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) set a due date (b) earn stickers (c) see tasks by day (d) add a homework task
9. 9.🐞 Finding and fixing bugs is called ___. (a) decorating (b) designing (c) downloading (d) debugging
10. 10.Which of these is true of a website? (a) has a home-screen icon (b) is installed on a phone (c) updates from the store (d) has a web address
11. 11.💾 What does this code show? (Positions start at 0.)
    let songs = ["Sunrise", "Rain", "Monsoon"];
    show(songs[1]); (a) Sunrise (b) Monsoon (c) Rain
12. 12.🔍 Which is the odd one out? (a) the font size (b) whether users get lost (c) how fast a task is done (d) how many taps it takes
13. 13.💾 What number does this code show?
    let notes = ["Hindi", "Art", "Music", "Sports"];
    notes.push("Maths");
    notes.push("Science");
    show(notes.length);
14. 14.True or false: an app that just says hi solves no real problem. (a) True (b) False
15. 15.🗂️ What kind of app is a word battle? (a) a game (b) a learning app (c) a health app (d) a tool app
16. 16.🧰 What is a function? (a) a named block of code (b) a screen size (c) a type of phone (d) a list of colours
17. 17.Which of these is true of an app? (a) updates from the store (b) opens in a web browser (c) needs no installing (d) has a web address
18. 18.📱 Which one comes from an app store: an app or a website? (a) a website (b) an app
19. 19.True or false: a unit converter is a learning app. (a) True (b) False
20. 20.True or false: grey text on grey is good button design. (a) True (b) False
21. 21.💾 What does this code show? (Positions start at 0.)
    let friends = ["Zoya", "Arjun", "Aman"];
    show(friends[1]); (a) Arjun (b) Aman (c) Zoya
22. 22.🔁 What number does this code show?
    let runs = [22, 62, 69];
    let count = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] >= 40) {
        count = count + 1;
      }
    }
    show(count);
23. 23.True or false: a word battle is a game. (a) False (b) True
24. 24.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 40; // start at 40
    line 2: stars = stars + 2; // double it
    line 3: stars = stars + 6; // add 6
    line 4: stars = stars - 2; // take away 2
    line 5: show(stars); // show it
25. 25.🗒️ Version 1 of a quiz app must be ready in 9 days. How many days are left for extras after the must-haves?
    show a question: 1 days
    check the answer: 3 days
    show the score: 4 days
26. 26.👆 The user taps the button 5 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) ON (b) OFF
27. 27.🔁 What is the LAST line this code shows?
    let names = ["Kabir", "Riya", "Zoya", "Aman", "Meera"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Meera (b) Hi, Kabir (c) Hi, Zoya (d) Hi, Riya
28. 28.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 72 px tall
    Cancel button: 28 px tall
    Start button: 72 px tall
    Send button: 52 px tall (a) Start (b) Save (c) Send (d) Cancel
29. 29.Which of these is a feature? (a) “What should I cook?” (b) “I keep missing the bus” (c) a share button (d) “Small text is hard”
30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 52 px tall
    Send button: 52 px tall
    Save button: 32 px tall
    Back button: 52 px tall (a) Save (b) Next (c) Send (d) Back
31. 31.🧭 Where is a tab bar usually placed in a phone app? (a) in the middle (b) inside a button (c) nowhere (d) at the bottom
32. 32.Which of these is true of a website? (a) has a home-screen icon (b) opens in a web browser (c) is installed on a phone (d) updates from the store
33. 33.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Title: 26 px
    Footer: 21 px
    Body text: 11 px (a) Footer (b) Body text (c) Title
34. 34.True or false: speaking a command is an output. (a) True (b) False
35. 35.🧰 Why write a function? (a) to slow the app (b) to reuse code (c) to hide errors (d) to make code longer
36. 36.🗒️ You are planning version 1 of a bus tracker. Which feature is a MUST-HAVE? (a) pick your bus stop (b) a dark mode (c) change the bus icon (d) rate the driver
37. 37.🎯 An app for “everyone” with no clear user usually ___. (a) needs no testing (b) wins every prize (c) is easy to build (d) helps nobody well
38. 38.True or false: a beep sound is an input. (a) True (b) False
39. 39.🗒️ A to-do app with no “add a task” feature is ___. (a) ready to release (b) well planned (c) missing a must-have (d) a nice extra
40. 40.🔐 Which permission does a barcode scanner really need? (a) the microphone (b) the camera (c) location (d) contacts

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