App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 646 · 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.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let coins = 44; // start at 44
   line 2: coins = coins - 5; // take away 5
   line 3: coins = coins - 3; // add 3
   line 4: show(coins); // show it
2. 2.🔀 What number does this shop app show?
   let total = 800;
   if (total > 500) {
     total = total - 50;
   }
   show(total);
3. 3.⚙️ What number does this app show?
   let km = 8; // typed by the user
   let metres = km * 1000;
   show(metres);
4. 4.True or false: checking a password is an input. (a) True (b) False
5. 5.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
6. 6.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
7. 7.🐞 Finding and fixing bugs is called ___. (a) downloading (b) decorating (c) debugging (d) designing
8. 8.📊 Survey: which problem bugs you most? Which problem should your app solve first?
   forgetting homework: 22 votes
   no quiet study place: 17 votes
   missing the bus: 14 votes (a) missing the bus (b) no quiet study place (c) forgetting homework
9. 9.🌐 Which program do you need to open a website? (a) a calculator (b) a web browser (c) an app store (d) a camera app
10. 10.📱 Which one opens from a link: an app or a website? (a) a website (b) an app
11. 11.🔁 What number does this code show?
    let scores = [87, 67, 56];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 60) {
        count = count + 1;
      }
    }
    show(count);
12. 12.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. tap the Settings tab
    2. tap the Feed tab
    3. open “Match report”
    4. open “Score card”
    How many times must you tap Back to reach the main screen of this tab?
13. 13.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let points = 49; // start at 49
    line 2: points = points * 2; // double it
    line 3: points = points + 2; // double it
    line 4: points = points * 2; // double it
    line 5: show(points); // show it
14. 14.🛠️ At which stage do you try every button? (a) the release stage (b) the idea stage (c) the build stage (d) the test stage
15. 15.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. tap the Profile tab
    2. open “Match report”
    3. open “Match report”
    How many times must you tap Back to reach the main screen of this tab?
16. 16.🔀 What number does this shop app show?
    let total = 330;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
17. 17.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 60; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 2 (c) line 3 (d) line 1
18. 18.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Quiz tab
    2. open “Video”
    3. open “Match report”
    4. tap the Me tab
    5. open “Badges”
    Which screen are you on now? (a) Video (b) Lessons (c) Match report (d) Badges
19. 19.🚀 Which version is newer: 2.0.6 or 2.0.12? (a) 2.0.12 (b) 2.0.6
20. 20.🔢 After an app is released, what comes right after “read user reviews”? (a) release an update (b) list what to fix (c) test it again (d) fix and improve
21. 21.📊 Survey: which problem bugs you most? How many more votes did “missing the bus” get than “losing water bottles”?
    missing the bus: 8 votes
    losing water bottles: 6 votes
    wasting pocket money: 7 votes
22. 22.True or false: how users feel after is about UI (the look). (a) False (b) True
23. 23.🖼️ In this wireframe (top to bottom), what is right above the Add button?
    [ title text ]
    [ search box ]
    [ Save button ]
    [ Add button ] (a) search box (b) title text (c) Save button
24. 24.🔀 What does this sign-up rule show?
    let age = 14;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Ask a parent (b) Welcome!
25. 25.👥 A school app has 140 students, 60 teachers and 205 parents as users. How many users does it have in all?
26. 26.🔀 In this course’s code, which sign tests “is equal to”? (a) !== (b) === (c) = (d) =>
27. 27.Which of these is true of a menu button? (a) undoes one move (b) opens a list of pages (c) sits at the bottom (d) goes to the last screen
28. 28.True or false: the button colours is about UX (the experience). (a) True (b) False
29. 29.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Address → Results
    Design B: Home → Shop → Search → Confirm → Pens → Pay → Item
30. 30.🔢 When you make an app, which comes first: “test the app” or “plan the screens”? (a) plan the screens (b) test the app
31. 31.🧭 Where is a tab bar usually placed in a phone app? (a) nowhere (b) in the middle (c) at the bottom (d) inside a button
32. 32.🗒️ What is a must-have feature? (a) a sound effect (b) one the app cannot skip (c) a colour theme (d) a nice extra
33. 33.🧩 Which of these is a button on this screen?
    [title] Sign Up
    [button] Next
    [slider] Text size
    [button] Send
    [text box] City (a) Send (b) City (c) Text size
34. 34.♿ Showing right or wrong only in red and green is a problem for ___. (a) the server (b) colour-blind users (c) fast typists (d) the battery
35. 35.⚙️ In an app, is checking a password an input, processing or an output? (a) input (b) processing (c) output
36. 36.🔁 What number does this code show?
    let marks = [7, 18, 9, 1, 10];
    let best = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] > best) {
        best = marks[i];
      }
    }
    show(best);
37. 37.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Pens → Menu
    Design B: Home → Search → Item → Menu → Pens → Results
38. 38.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 41; // start at 41
    line 2: stars = stars - 3; // take away 3
    line 3: stars = stars - 5; // take away 3
    line 4: show(stars); // show it (a) line 2 (b) line 1 (c) line 3
39. 39.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) see where the bus is (b) show arrival time (c) rate the driver (d) pick your bus stop
40. 40.📅 An app team plans for 2 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?

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