App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 230 · 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.🔁 A loop over a list of 5 items runs its body how many times? (a) 1 (b) 4 (c) 5 (d) 6
2. 2.🔀 In this course’s code, which sign tests “is equal to”? (a) = (b) !== (c) => (d) ===
3. 3.True or false: you try every button at the test stage. (a) True (b) False
4. 4.🧪 What is the ACTUAL result of Test 1?
   🎟️ 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(7) → expected 50
   Test 2: price(18) → expected 100
   Test 3: price(17) → expected 100
5. 5.🧰 What number does this code show?
   function total(price, qty) {
     return price * qty;
   }
   show(total(45, 4));
6. 6.👥 A school app has 75 students, 280 teachers and 205 parents as users. Which user group is the biggest? (a) parents (b) students (c) teachers
7. 7.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let coins = 38; // start at 38
   line 2: coins = coins + 6; // add 4
   line 3: coins = coins * 2; // double it
   line 4: show(coins); // show it
8. 8.✏️ A box with a cross in a wireframe usually means ___. (a) delete this (b) an error (c) a closed app (d) a picture goes here
9. 9.👆 The user types Arjun in nameBox and taps the button 1 time. What does the label show?
   button.onTap = function () {
     label.text = "Hello, " + nameBox.text + "!";
   }; (a) Hello! (b) Arjun (c) Hello, nameBox.text! (d) Hello, Arjun!
10. 10.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let points = 38; // start at 35
    line 2: points = points * 2; // double it
    line 3: points = points - 4; // take away 4
    line 4: show(points); // show it (a) line 2 (b) line 3 (c) line 1
11. 11.🔀 What does if / else let an app do? (a) draw a screen (b) repeat forever (c) save a photo (d) pick one of two actions
12. 12.🧪 How many of these test cases pass?
    📝 Rule: a quiz is passed with 5 or more right answers.
    function result(right) {
      if (right > 5) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(7) → expected Pass
    Test 2: result(2) → expected Try again
    Test 3: result(9) → expected Pass
13. 13.🧩 Which input is best for choosing a volume level? (a) a title (b) a switch (c) a text box (d) a slider
14. 14.🔁 What number does this code show?
    let steps = [71, 79, 45, 62, 50];
    let count = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] >= 70) {
        count = count + 1;
      }
    }
    show(count);
15. 15.📊 Survey: which problem bugs you most? How many more votes did “wasting pocket money” get than “missing the bus”?
    missing the bus: 6 votes
    forgetting birthdays: 20 votes
    wasting pocket money: 18 votes
16. 16.💾 What number does this code show?
    let songs = ["Stars", "Monsoon", "Ocean", "Kites"];
    songs.push("Sunrise");
    songs.push("Rain");
    show(songs.length);
17. 17.🔢 In a quiz-app flow, which comes first: “pick an answer” or “read a question”? (a) read a question (b) pick an answer
18. 18.🔢 In a photo-post flow, what comes right after “take the photo”? (a) add a filter (b) open the camera screen (c) post the photo (d) write a caption
19. 19.🔢 After an app is released, which comes FIRST? (a) read user reviews (b) test it again (c) list what to fix (d) release an update
20. 20.True or false: a class leaderboard fits saving in the cloud. (a) False (b) True
21. 21.True or false: working out a tip is an input. (a) True (b) False
22. 22.🔁 What number does this code show?
    let scores = [3, 3, 15];
    let best = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] > best) {
        best = scores[i];
      }
    }
    show(best);
23. 23.Which of these helps everyone use the app? (a) colour as the only clue (b) big touch targets (c) icons with no labels (d) tiny tap areas
24. 24.🗒️ Why keep version 1 small? (a) to look bigger (b) to confuse users (c) to learn from users soon (d) to use up storage
25. 25.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
26. 26.🧩 What do we call one full page of an app? (a) a cable (b) a variable (c) a battery (d) a screen
27. 27.🔀 What does this battery rule show?
    let battery = 65;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
28. 28.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Match report”
    2. tap Back
    3. open “Score card”
    How many times must you tap Back to reach the main screen of this tab?
29. 29.🔍 Which is the odd one out? (a) icons with no labels (b) tiny tap areas (c) sudden loud sounds (d) text that can grow
30. 30.🔢 In a sign-up flow, which comes LAST? (a) open the app (b) make a password (c) see the home screen (d) type name and email
31. 31.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 45; // start at 45
    line 2: lives = lives * 2; // double it
    line 3: lives = lives + 8; // add 6
    line 4: show(lives); // show it
32. 32.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
33. 33.True or false: a website has a home-screen icon. (a) True (b) False
34. 34.🧩 Which of these is a button on this screen?
    [title] New Note
    [button] Next
    [text box] City
    [switch] Remind me
    [text box] Notes (a) City (b) Remind me (c) Next (d) Notes
35. 35.Which of these fits saving on the phone? (a) a shared to-do list (b) your last game level (c) a class leaderboard (d) photos on two devices
36. 36.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 45; // start at 43
    line 2: stars = stars + 2; // add 2
    line 3: stars = stars + 4; // add 4
    line 4: stars = stars + 3; // add 3
    line 5: show(stars); // show it (a) line 1 (b) line 4 (c) line 2 (d) line 3
37. 37.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Map”
    2. tap Back
    3. open “Map”
    How many times must you tap Back to reach the main screen of this tab?
38. 38.🧭 Which part of navigation switches main sections? (a) a tab bar (b) a menu button (c) the back button
39. 39.🧪 One test case fails. Which one?
    🚚 Rule: delivery is free (0) when the order is 600 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 600) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(550) → expected 40
    Test 2: delivery(800) → expected 0
    Test 3: delivery(600) → expected 0 (a) Test 2 (b) Test 3 (c) Test 1
40. 40.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Shop → Cart → Offers
    Design B: Home → Cart → Shop (a) Design B (b) Design A

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