App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 212 · 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.🚀 Your app is at version 3.1.9. The next release adds a new feature. What is its version number? (a) 4.0.0 (b) 3.2.9 (c) 3.1.10 (d) 3.2.0
2. 2.🔍 Which is the odd one out? (a) a buzz (vibration) (b) a pop-up message (c) checking a password (d) a beep sound
3. 3.True or false: taking a photo is an output. (a) False (b) True
4. 4.True or false: “colour as the only clue” helps everyone use the app. (a) True (b) False
5. 5.🔢 In a sign-up flow, which comes first: “enter the code sent” or “type name and email”? (a) enter the code sent (b) type name and email
6. 6.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let points = 48; // start at 48
   line 2: points = points + 2; // double it
   line 3: points = points + 6; // add 6
   line 4: show(points); // show it (a) line 3 (b) line 1 (c) line 2
7. 7.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 24 px tall. How many px taller must it be?
8. 8.Which of these is data? (a) your high score (b) the game-over page (c) tap to Start (d) a date picker
9. 9.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let stars = 34; // start at 33
   line 2: stars = stars + 2; // add 2
   line 3: stars = stars * 2; // double it
   line 4: stars = stars - 5; // take away 5
   line 5: show(stars); // show it
10. 10.True or false: a final design shows where things go. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) text that can grow (b) captions on videos (c) colour as the only clue (d) strong colour contrast
12. 12.🔢 After an app is released, what comes right after “test it again”? (a) release an update (b) list what to fix (c) fix and improve (d) read user reviews
13. 13.🔁 What number does this code show?
    let runs = [14, 6, 8, 7, 2];
    let best = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] > best) {
        best = runs[i];
      }
    }
    show(best);
14. 14.🔍 Which is the odd one out? (a) sorting the scores (b) tapping a button (c) typing your age (d) speaking a command
15. 15.👆 The user taps the button 4 times. What number does the label show now?
    let score = 7;
    button.onTap = function () {
      score = score + 2;
      label.text = score;
    };
16. 16.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 52; // start at 49
    line 2: coins = coins + 4; // add 4
    line 3: coins = coins * 2; // double it
    line 4: coins = coins + 3; // add 3
    line 5: show(coins); // show it
17. 17.True or false: the user types a letter is a load event. (a) False (b) True
18. 18.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 1, 2, 3 (b) 0, 1, 2, 3 (c) 3 (d) 0, 1, 2
19. 19.⚙️ In an app, is a buzz (vibration) an input, processing or an output? (a) input (b) processing (c) output
20. 20.🔢 In a sign-up flow, which comes first: “enter the code sent” or “see the home screen”? (a) see the home screen (b) enter the code sent
21. 21.🔁 What number does this code show?
    let steps = [13, 7, 15, 13, 2];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
22. 22.🔀 What does this PIN rule show?
    let pin = "8032";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) Use 4 digits (b) PIN saved
23. 23.👆 What kind of event is this: a 5-minute alarm ends? (a) a text event (b) a tap event (c) a load event (d) a timer event
24. 24.🌗 Is light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
25. 25.📱 Which one updates from the store: an app or a website? (a) an app (b) a website
26. 26.🔐 Which permission does a barcode scanner really need? (a) contacts (b) location (c) the microphone (d) the camera
27. 27.Which of these happens at the idea stage? (a) draw the user flow (b) share the download link (c) connect the data (d) list what users need
28. 28.🧰 What does return do in a function? (a) closes the screen (b) deletes the app (c) sends back a value (d) repeats the code
29. 29.True or false: the user presses Save is a text event. (a) True (b) False
30. 30.🛠️ At which stage do you spot a problem to solve? (a) the idea stage (b) the test stage (c) the build stage (d) the plan stage
31. 31.True or false: the search box changes is a load event. (a) False (b) True
32. 32.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 36; // start at 34
    line 2: lives = lives * 2; // double it
    line 3: lives = lives + 4; // add 4
    line 4: show(lives); // show it (a) line 2 (b) line 3 (c) line 1
33. 33.Which of these app ideas solves a real problem? (a) an app that just says hi (b) a page of random dots (c) a button with no action (d) a library due-date alert
34. 34.🧭 Which part of navigation opens a list of pages? (a) a menu button (b) the back button (c) a tab bar
35. 35.🗒️ In MVP, the M stands for ___. (a) music (b) mobile (c) maximum (d) minimum
36. 36.True or false: a final design has no real colours. (a) False (b) True
37. 37.👆 A tap handler runs how many times if the user taps 4 times? (a) 4 (b) 8 (c) 1 (d) 0
38. 38.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 33; // start at 33
    line 2: stars = stars + 5; // add 5
    line 3: stars = stars + 4; // add 4
    line 4: stars = stars - 2; // add 2
    line 5: show(stars); // show it
39. 39.💾 What does this code show? (Positions start at 0.)
    let songs = ["Kites", "Stars", "Ocean"];
    show(songs[1]); (a) Ocean (b) Stars (c) Kites
40. 40.🎯 Who are the users of an app? (a) the people who use it (b) the app icons (c) only the coders (d) only the testers

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