App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 711 · 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?
   function double(n) {
     return n * 2;
   }
   show(double(8));
2. 2.🛠️ At which stage do you let friends try it? (a) the build stage (b) the release stage (c) the idea stage (d) the test stage
3. 3.🔢 When you make an app, which comes first: “get an idea” or “release it”? (a) release it (b) get an idea
4. 4.🧩 What does a button do when you tap it? (a) changes the phone (b) saves the battery (c) starts an action (d) shows the time
5. 5.💾 Saving data in the cloud lets you ___. (a) never need a password (b) shrink the app (c) use it on any device (d) skip the internet
6. 6.True or false: a speak-to-type notes app needs the microphone. (a) False (b) True
7. 7.🧪 Values right at a limit, like age 12 for “under 12”, are called ___. (a) old cases (b) easy cases (c) edge cases (d) phone cases
8. 8.👆 Two designs for the same task (each arrow is one tap). How many taps does Design B need?
   Design A: Home → Cart → Search → Offers → Pay → Shop
   Design B: Home → Address → Search → Item → Pay → Shop → Offers
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 10; // 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 1 (b) line 2 (c) line 3 (d) line 4
10. 10.🧪 What is the actual result of a test? (a) what we hope for (b) the test’s number (c) the app’s name (d) what the app really does
11. 11.📱 Which one opens from a link: an app or a website? (a) an app (b) a website
12. 12.🔢 In a quiz-app flow, which comes first: “see the final score” or “read a question”? (a) see the final score (b) read a question
13. 13.🔁 Why use a loop to show 100 messages? (a) it is slower (b) it hides them (c) less code to write (d) it uses more lines
14. 14.📅 An app team plans for 5 days, builds for 4 days, tests for 1 days and releases on 1 more day. Planning starts on day 1. On which day does building finish?
15. 15.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(17));
16. 16.🗒️ You are planning version 1 of a water reminder. Which feature is a MUST-HAVE? (a) share your streak (b) water animations (c) custom alert sounds (d) log a glass of water
17. 17.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Edit photo”
    2. open “Score card”
    3. tap Back
    4. open “Friend list”
    How many times must you tap Back to reach the main screen of this tab?
18. 18.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Edit photo”
    2. open “Map”
    3. tap Back
    4. open “Score card”
    5. tap Back
    Which screen are you on now? (a) Edit photo (b) Map (c) Feed (d) Score card
19. 19.💡 How can you check that people really have the problem? (a) pick a colour (b) just guess (c) ask possible users (d) copy another app
20. 20.✏️ Is this true of a wireframe or of a final design: shows where things go? (a) a wireframe (b) a final design
21. 21.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Sign Up
    [button] Help
    [text box] Email
    [text box] Notes
    [button] Cancel
    [button] Done
22. 22.🔢 In a sign-up flow, which comes LAST? (a) make a password (b) enter the code sent (c) tap “Sign up” (d) see the home screen
23. 23.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
24. 24.♿ A screen has 7 icon buttons. Only 3 of them have a text label for screen readers. How many still need a label?
25. 25.🔍 Which is the odd one out? (a) how fast a task is done (b) how many taps it takes (c) the screen layout (d) how easy sign-up is
26. 26.🔀 What does this PIN rule show?
    let pin = "72350";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) Use 4 digits (b) PIN saved
27. 27.🔀 Which badge does this quiz app show?
    let marks = 69;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Silver (b) Gold (c) Bronze
28. 28.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) on the phone (b) in the cloud
29. 29.🗒️ In MVP, the M stands for ___. (a) maximum (b) mobile (c) minimum (d) music
30. 30.💡 Does an app idea like a lost-and-found board solve a real problem? (a) Yes (b) No
31. 31.🔀 In a good flow, each screen should lead to ___. (a) a clear next step (b) a random page (c) the same screen (d) a dead end
32. 32.🔀 What does this PIN rule show?
    let pin = "641";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) Use 4 digits (b) PIN saved
33. 33.True or false: a big, easy tap area is poor button design. (a) False (b) True
34. 34.🚀 What should an app ask for only when it really needs it? (a) its name (b) a permission (c) its icon (d) a font
35. 35.💾 What number does this code show?
    let friends = ["Arjun", "Aman"];
    friends.push("Riya");
    friends.push("Kabir");
    show(friends.length);
36. 36.True or false: a voice recorder needs your location. (a) True (b) False
37. 37.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 51; // start at 49
    line 2: coins = coins * 2; // double it
    line 3: coins = coins + 3; // add 3
    line 4: coins = coins - 1; // take away 1
    line 5: show(coins); // show it
38. 38.♿ Showing right or wrong only in red and green is a problem for ___. (a) the battery (b) colour-blind users (c) fast typists (d) the server
39. 39.👆 The user taps the button 6 times. What number does the label show now?
    let coins = 7;
    button.onTap = function () {
      coins = coins + 1;
      label.text = coins;
    };
40. 40.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let coins = 40; // start at 38
    line 2: coins = coins - 4; // take away 4
    line 3: coins = coins * 2; // double it
    line 4: coins = coins + 4; // add 4
    line 5: show(coins); // show it

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