App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 388 · 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 shop app show?
   let total = 550;
   if (total > 500) {
     total = total - 50;
   }
   show(total);
2. 2.🧩 In an app, what is the game-over page? (a) data (b) an input (c) a screen (d) a button
3. 3.🧪 What is the ACTUAL result of Test 1?
   🎟️ Rule: a ticket costs 50 for children under 10, and 100 for everyone else.
   function price(age) {
     if (age < 10) {
       return 50;
     }
     return 100;
   }
   Test 1: price(10) → expected 100
   Test 2: price(15) → expected 100
   Test 3: price(8) → expected 50
4. 4.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) export to a file (b) savings stickers (c) pie-chart colours (d) show the balance
5. 5.True or false: a blank grey screen solves no real problem. (a) True (b) False
6. 6.♿ A screen has 5 icon buttons. Only 2 of them have a text label for screen readers. How many still need a label?
7. 7.🧭 Tapping a tab usually takes you to ___. (a) that tab’s main screen (b) a random page (c) the last app used (d) the phone settings
8. 8.🐞 After fixing a bug you should ___. (a) release at once (b) never test (c) delete the test (d) test it again
9. 9.👆 Two designs for the same task (each arrow is one tap). How many taps does Design A need?
   Design A: Home → Pens → Pay → Item → Search → Cart
   Design B: Home → Results → Confirm
10. 10.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(4));
11. 11.🧭 Which part of navigation opens a list of pages? (a) the back button (b) a menu button (c) a tab bar
12. 12.True or false: a step counter is a health app. (a) False (b) True
13. 13.♿ Does this help everyone, or make the app harder to use: sudden loud sounds? (a) makes it harder (b) helps everyone
14. 14.🧰 What does this code show?
    function greet(name) {
      return "Hello, " + name + "!";
    }
    show(greet("Arjun")); (a) Hello, name! (b) greet (c) Arjun (d) Hello, Arjun!
15. 15.📊 Survey: which problem bugs you most? How many students voted in all?
    missing the bus: 14 votes
    no quiet study place: 9 votes
    wasting pocket money: 13 votes
16. 16.🗒️ When should nice-to-have features be built? (a) before anything (b) after the must-haves (c) never (d) on day one
17. 17.👆 The user types Kabir in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Hi, " + nameBox.text + "!";
    }; (a) Hi, nameBox.text! (b) Hi! (c) Kabir (d) Hi, Kabir!
18. 18.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 44; // start at 41
    line 2: stars = stars - 3; // take away 3
    line 3: stars = stars * 2; // double it
    line 4: stars = stars - 3; // take away 3
    line 5: show(stars); // show it
19. 19.🧪 How many of these test cases pass?
    🎟️ 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(14) → expected 100
    Test 2: price(4) → expected 50
    Test 3: price(12) → expected 100
20. 20.🗒️ Why keep version 1 small? (a) to learn from users soon (b) to confuse users (c) to look bigger (d) to use up storage
21. 21.📲 What happens when you tap an app’s icon? (a) the app is deleted (b) the phone charges (c) the app opens (d) the sound turns off
22. 22.🔁 What number does this code show?
    let marks = [31, 68, 46, 88];
    let count = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] >= 40) {
        count = count + 1;
      }
    }
    show(count);
23. 23.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 8 or more right answers.
    function result(right) {
      if (right > 8) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(9) → expected Pass
    Test 2: result(8) → expected Pass
    Test 3: result(6) → expected Try again (a) Test 2 (b) Test 1 (c) Test 3
24. 24.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 14, and 100 for everyone else.
    function price(age) {
      if (age <= 14) {
        return 50;
      }
      return 100;
    }
    Test 1: price(12) → expected 50
    Test 2: price(18) → expected 100
    Test 3: price(14) → expected 100 (a) Test 3 (b) Test 1 (c) Test 2
25. 25.🔢 After an app is released, which comes LAST? (a) read user reviews (b) test it again (c) fix and improve (d) release an update
26. 26.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 37; // start at 37
    line 2: lives = lives + 3; // add 3
    line 3: lives = lives * 2; // double it
    line 4: lives = lives - 2; // add 2
    line 5: show(lives); // show it
27. 27.Which of these requests asks for too much? (a) calling app → contacts (b) camera app → camera (c) quiz app → microphone (d) voice notes → microphone
28. 28.🔁 What is the LAST line this code shows?
    let names = ["Zoya", "Arjun", "Riya", "Aman", "Meera"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Arjun (b) Hi, Riya (c) Hi, Meera (d) Hi, Zoya
29. 29.Which of these is about UI (the look)? (a) whether users get lost (b) how easy sign-up is (c) how fast a task is done (d) the theme colours
30. 30.🔢 When you make an app, which comes first: “plan the screens” or “build the app”? (a) plan the screens (b) build the app
31. 31.🚀 Which version is newer: 4.3.10 or 4.3.3? (a) 4.3.3 (b) 4.3.10
32. 32.🗒️ Version 1 of a pocket-money tracker must be ready in 4 days. How many days are left for extras after the must-haves?
    add money received: 1 days
    add money spent: 1 days
    show the balance: 2 days
33. 33.True or false: space between buttons is good button design. (a) False (b) True
34. 34.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Footer: 18 px
    Hint: 21 px
    Menu: 12 px (a) Menu (b) Footer (c) Hint
35. 35.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(2) + points(3));
36. 36.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting homework: 16 votes
    missing the bus: 20 votes
    no quiet study place: 15 votes (a) missing the bus (b) forgetting homework (c) no quiet study place
37. 37.🚀 In version 2.5.1, which number is the major version? (a) 251 (b) 2 (c) 1 (d) 5
38. 38.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Edit photo”
    2. tap Back
    3. tap the Profile tab
    4. open “Badges”
    Which screen are you on now? (a) Edit photo (b) Badges (c) Search (d) Home
39. 39.🧰 In function tip(bill), what is bill? (a) a loop (b) a parameter (c) an event (d) a screen
40. 40.🔢 In a photo-post flow, which comes FIRST? (a) write a caption (b) post the photo (c) open the camera screen (d) add a filter

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students