App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 278 · 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 code show?
   let coins = 3;
   coins = coins - 2;
   coins = coins + 3;
   show(coins);
2. 2.🔢 In a quiz-app flow, which comes first: “read a question” or “see if it is right”? (a) see if it is right (b) read a question
3. 3.🧭 Which part of navigation goes to the last screen? (a) a tab bar (b) the back button (c) a menu button
4. 4.👥 A school app has 20 students, 80 teachers and 90 parents as users. How many users does it have in all?
5. 5.⚙️ What number does this app show?
   let price = 10; // typed by the user
   let qty = 3; // typed by the user
   let total = price * qty;
   show(total);
6. 6.True or false: a website has a home-screen icon. (a) True (b) False
7. 7.🧭 Tapping a tab usually takes you to ___. (a) that tab’s main screen (b) the last app used (c) a random page (d) the phone settings
8. 8.True or false: the user types a letter is a tap event. (a) True (b) False
9. 9.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Done button: 44 px tall
   Next button: 60 px tall
   Send button: 56 px tall (a) Done (b) Next (c) Send
10. 10.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 37; // start at 37
    line 2: lives = lives - 1; // take away 1
    line 3: lives = lives + 5; // add 5
    line 4: lives = lives - 2; // add 2
    line 5: show(lives); // show it (a) line 4 (b) line 2 (c) line 1 (d) line 3
11. 11.👆 The user taps the button 4 times. What does the label show now?
    let on = false;
    button.onTap = function () {
      on = !on;
      if (on) {
        label.text = "ON";
      } else {
        label.text = "OFF";
      }
    }; (a) OFF (b) ON
12. 12.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let points = 34; // start at 34
    line 2: points = points - 2; // take away 2
    line 3: points = points + 6; // add 5
    line 4: show(points); // show it (a) line 2 (b) line 3 (c) line 1
13. 13.True or false: the button colours is about UX (the experience). (a) False (b) True
14. 14.♿ A screen has 7 icon buttons. Only 3 of them have a text label for screen readers. How many still need a label?
15. 15.Which of these fits saving in the cloud? (a) the sound on/off setting (b) your last game level (c) notes to read offline (d) a class leaderboard
16. 16.👥 A library app has 230 readers, 35 librarians and 20 volunteers as users. Which user group is the biggest? (a) librarians (b) readers (c) volunteers
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 20; // typed by the user
    line 2: let qty = 3; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 3 (c) line 1 (d) line 4
18. 18.💾 In most code, the first item of a list is at position ___. (a) 2 (b) 1 (c) 10 (d) 0
19. 19.🔀 A screen with no way forward or back is called a ___. (a) dead end (b) tab bar (c) home screen (d) shortcut
20. 20.🧰 Why write a function? (a) to hide errors (b) to slow the app (c) to reuse code (d) to make code longer
21. 21.📊 Survey: which problem bugs you most? How many students voted in all?
    wasting pocket money: 22 votes
    forgetting birthdays: 24 votes
    forgetting homework: 5 votes
22. 22.Which of these happens at the idea stage? (a) write the code (b) share the download link (c) draw the user flow (d) spot a problem to solve
23. 23.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(20, 2));
24. 24.👆 The user taps the button 2 times. What number does the label show now?
    let lives = 2;
    button.onTap = function () {
      lives = lives + 5;
      label.text = lives;
    };
25. 25.🧪 What is the ACTUAL result of Test 3?
    🚚 Rule: delivery is free (0) when the order is 700 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 700) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(700) → expected 0
    Test 2: delivery(650) → expected 40
    Test 3: delivery(850) → expected 0
26. 26.👥 A cricket club app has 115 players, 25 coaches and 230 fans as users. How many more fans than players are there?
27. 27.💡 An app that tries to do everything at once is usually ___. (a) very small (b) easy to build (c) finished fast (d) hard to use
28. 28.🧰 In function tip(bill), what is bill? (a) a parameter (b) a loop (c) an event (d) a screen
29. 29.True or false: a website is installed on a phone. (a) False (b) True
30. 30.Which of these is true of an app? (a) has a web address (b) comes from an app store (c) opens from a link (d) opens in a web browser
31. 31.True or false: a shared to-do list fits saving in the cloud. (a) True (b) False
32. 32.True or false: the user presses Save is a timer event. (a) False (b) True
33. 33.🧩 Which of these is a button on this screen?
    [title] New Note
    [text box] City
    [button] Help
    [button] Next
    [slider] Volume
    [text box] Subject
    [button] Send (a) Subject (b) Help (c) City (d) Volume
34. 34.👆 The user taps the button 3 times. What does the label show now?
    let on = false;
    button.onTap = function () {
      on = !on;
      if (on) {
        label.text = "ON";
      } else {
        label.text = "OFF";
      }
    }; (a) OFF (b) ON
35. 35.True or false: a sleep tracker is a health app. (a) True (b) False
36. 36.🗒️ You are planning version 1 of a quiz app. Which feature can WAIT for a later version? (a) show the score (b) show a question (c) confetti effects (d) check the answer
37. 37.🎯 Which app would help this user most: a reader who finds small print hard? (a) a pocket-money tracker (b) a bus tracker (c) a homework planner (d) a big-text reader
38. 38.True or false: typing your age is processing. (a) True (b) False
39. 39.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(2) + points(3));
40. 40.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) share tasks to friends (b) pick a theme colour (c) add a homework task (d) earn stickers

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