App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 953 · 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.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
   1. tap the Feed tab
   2. open “Map”
   3. tap Back
   How many times must you tap Back to reach the main screen of this tab?
2. 2.🧰 What number does this code show?
   function total(price, qty) {
     return price * qty;
   }
   show(total(85, 2));
3. 3.True or false: a page of random dots solves a real problem. (a) False (b) True
4. 4.🚀 Your app is at version 1.7.5. The next release fixes a small bug. What is its version number? (a) 2.0.0 (b) 1.8.0 (c) 1.7.6 (d) 1.8.5
5. 5.🔁 What number does this code show?
   let scores = [38, 50, 22, 23, 12];
   let count = 0;
   for (let i = 0; i < scores.length; i++) {
     if (scores[i] >= 40) {
       count = count + 1;
     }
   }
   show(count);
6. 6.🧰 What number does this code show?
   function points(stars) {
     return stars * 10 + 5;
   }
   show(points(4) + points(3));
7. 7.🔁 A loop over a list of 5 items runs its body how many times? (a) 5 (b) 1 (c) 4 (d) 6
8. 8.🗒️ What is a must-have feature? (a) a sound effect (b) one the app cannot skip (c) a nice extra (d) a colour theme
9. 9.Which of these is a user need? (a) a share button (b) a search bar (c) “What should I cook?” (d) a reminder alarm
10. 10.🔐 Which permission does a bus tracker really need? (a) contacts (b) the camera (c) the microphone (d) location
11. 11.🔀 When does the else part run? (a) never (b) when the test is true (c) always (d) when the test is false
12. 12.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 52 px tall
    Cancel button: 40 px tall
    Save button: 48 px tall
    Next button: 40 px tall
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 number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(2) + points(0));
15. 15.🔍 Which is the odd one out? (a) a cricket run chase (b) a puzzle with levels (c) a word battle (d) a flashcard trainer
16. 16.True or false: buttons almost touching is good button design. (a) False (b) True
17. 17.🧩 Which part lets the user give the app information? (a) an input (b) a title (c) an icon (d) a logo
18. 18.🔁 What number does this code show?
    let runs = [20, 20, 14];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
19. 19.🔍 Which is the odd one out? (a) sorting the scores (b) a pop-up message (c) a beep sound (d) a buzz (vibration)
20. 20.👥 A library app has 140 readers, 255 librarians and 165 volunteers as users. How many more volunteers than readers are there?
21. 21.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 47; // start at 45
    line 2: lives = lives * 2; // double it
    line 3: lives = lives + 3; // add 3
    line 4: show(lives); // show it
22. 22.👥 A school app has 55 students, 105 teachers and 75 parents as users. Which user group is the biggest? (a) parents (b) teachers (c) students
23. 23.👆 The user types Riya in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Welcome, " + nameBox.text + "!";
    }; (a) Welcome, Riya! (b) Welcome, nameBox.text! (c) Riya (d) Welcome!
24. 24.Which of these is true of a tab bar? (a) hides extra links (b) sits at the bottom (c) goes to the last screen (d) undoes one move
25. 25.✏️ Do wireframes usually show the final colours? (a) Yes (b) No
26. 26.🔍 Which is the odd one out? (a) a times-table quiz (b) a spelling coach (c) a flashcard trainer (d) a puzzle with levels
27. 27.💾 Which works with no internet at all? (a) a cloud leaderboard (b) a cloud backup (c) a shared chat (d) data saved on the phone
28. 28.True or false: a tiny 20 px button is good button design. (a) True (b) False
29. 29.💾 What number does this code show?
    let friends = ["Aman", "Zoya", "Meera"];
    friends.push("Riya");
    show(friends.length);
30. 30.🧰 What is a function? (a) a screen size (b) a named block of code (c) a list of colours (d) a type of phone
31. 31.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Hint: 16 px
    Footer: 18 px
    Caption: 20 px
    Menu: 9 px (a) Caption (b) Hint (c) Footer (d) Menu
32. 32.📅 An app team plans for 3 days, builds for 8 days, tests for 2 days and releases on 1 more day. How many more days does building take than testing?
33. 33.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(5));
34. 34.🔁 What number does this code show?
    let scores = [4, 12, 7, 15, 19];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
35. 35.True or false: a voice recorder needs your contacts. (a) True (b) False
36. 36.🎯 What is the best first step to learn what users need? (a) ask and watch users (b) write the code (c) pick the colours (d) guess on your own
37. 37.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ Add button ]
    [ list of items ]
    [ tab bar ]
    [ title text ]
    [ Save button ] (a) list of items (b) tab bar (c) Add button (d) Save button
38. 38.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. tap the Settings tab
    2. open “Edit photo”
    3. tap the Feed tab
    4. tap the Chat tab
    How many times must you tap Back to reach the main screen of this tab?
39. 39.🗂️ What kind of app is a sleep tracker? (a) a learning app (b) a game (c) a tool app (d) a health app
40. 40.🎯 Is this a user need or a feature: a share button? (a) a user need (b) a feature

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