App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 635 · 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.True or false: an app has a web address. (a) False (b) True
2. 2.🧰 Why write a function? (a) to make code longer (b) to hide errors (c) to slow the app (d) to reuse code
3. 3.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 30; // typed by the user
   line 2: let qty = 2; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 3 (b) line 4 (c) line 1 (d) line 2
4. 4.🎯 Which app would help this user most: a gamer who forgets to drink? (a) a water reminder (b) a homework planner (c) a big-text reader (d) a recipe finder
5. 5.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) a pop-up message (d) a buzz (vibration)
6. 6.🗒️ The first small, working version of an app is often called an ___. (a) FAQ (b) URL (c) CPU (d) MVP
7. 7.🖼️ How many parts (boxes) does this wireframe have?
   [ top bar ]
   [ big picture ]
   [ title text ]
   [ search box ]
   [ menu icon ]
8. 8.💾 What is a variable? (a) a picture (b) a named box for a value (c) a phone setting (d) a type of screen
9. 9.👥 A cricket club app has 245 players, 55 coaches and 195 fans as users. How many users does it have in all?
10. 10.🎨 Is this about UI or UX: how easy sign-up is? (a) UX (b) UI
11. 11.Which of these is true of a menu button? (a) undoes one move (b) hides extra links (c) goes to the last screen (d) switches main sections
12. 12.🔍 Which is the odd one out? (a) draw the user flow (b) sketch the screens (c) pick the features (d) write the store text
13. 13.🔐 Which permission does a barcode scanner really need? (a) location (b) contacts (c) the microphone (d) the camera
14. 14.✏️ What is a wireframe? (a) the finished app (b) a type of password (c) a charging cable (d) a simple screen sketch
15. 15.🔁 What number does this code show?
    let scores = [13, 20, 10, 3, 6];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
16. 16.🧩 In an app, what is the home page of an app? (a) an input (b) data (c) a screen (d) a button
17. 17.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Friend list”
    2. tap Back
    3. open “Edit photo”
    4. tap the Feed tab
    5. open “Video”
    Which screen are you on now? (a) Edit photo (b) Video (c) Friend list (d) Feed
18. 18.💡 After a survey, which need should version 1 solve? (a) the newest trend (b) the most common need (c) the rarest need (d) a random need
19. 19.🚀 Which version is newer: 4.2.19 or 4.2.2? (a) 4.2.19 (b) 4.2.2
20. 20.True or false: you add the buttons at the idea stage. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) a water reminder (b) a spelling coach (c) a sleep tracker (d) a step counter
22. 22.👆 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) Kabir (b) Hi! (c) Hi, nameBox.text! (d) Hi, Kabir!
23. 23.🐞 After fixing a bug you should ___. (a) never test (b) test it again (c) release at once (d) delete the test
24. 24.🖼️ How many parts (boxes) does this wireframe have?
    [ menu icon ]
    [ Add button ]
    [ big picture ]
    [ title text ]
25. 25.🗒️ Why keep version 1 small? (a) to learn from users soon (b) to look bigger (c) to use up storage (d) to confuse users
26. 26.🔁 What number does this code show?
    let steps = [18, 1, 19, 5];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
27. 27.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 42; // start at 42
    line 2: stars = stars * 2; // double it
    line 3: stars = stars + 4; // add 4
    line 4: stars = stars + 8; // add 5
    line 5: show(stars); // show it
28. 28.🧰 What does return do in a function? (a) closes the screen (b) repeats the code (c) sends back a value (d) deletes the app
29. 29.🎯 Is this a user need or a feature: “What should I cook?”? (a) a feature (b) a user need
30. 30.Which of these app ideas solves no real problem? (a) a free study-room finder (b) a page of random dots (c) a bill splitter (d) a lost-and-found board
31. 31.📱 Which one is installed on a phone: an app or a website? (a) a website (b) an app
32. 32.👆 The user taps the button 6 times. What number does the label show now?
    let score = 7;
    button.onTap = function () {
      score = score + 5;
      label.text = score;
    };
33. 33.🔀 What number does this shop app show?
    let total = 570;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
34. 34.Which of these is an input? (a) a result on screen (b) tapping a button (c) sorting the scores (d) checking a password
35. 35.🔁 What number does this code show?
    let steps = [64, 86, 83];
    let count = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] >= 40) {
        count = count + 1;
      }
    }
    show(count);
36. 36.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Video”
    2. tap Back
    3. tap the Feed tab
    4. open “Edit photo”
    Which screen are you on now? (a) Feed (b) Chat (c) Edit photo (d) Video
37. 37.🔍 Which is the odd one out? (a) sorting the scores (b) a buzz (vibration) (c) adding up a bill (d) checking a password
38. 38.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. tap the Profile tab
    2. open “Video”
    3. tap the Search tab
    Which screen are you on now? (a) Home (b) Profile (c) Search (d) Video
39. 39.🔀 When does the else part run? (a) when the test is false (b) always (c) when the test is true (d) never
40. 40.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 0, 1, 2, 3 (b) 3 (c) 0, 1, 2 (d) 1, 2, 3

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