App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 195 · 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.🔍 Which is the odd one out? (a) a times-table quiz (b) a flashcard trainer (c) a spelling coach (d) a calculator
2. 2.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let score = 34; // start at 34
   line 2: score = score - 4; // add 4
   line 3: score = score - 1; // take away 1
   line 4: score = score - 4; // take away 4
   line 5: show(score); // show it
3. 3.🔍 Which is the odd one out? (a) labels on every icon (b) tiny tap areas (c) big touch targets (d) captions on videos
4. 4.🧪 How many of these test cases pass?
   🎟️ Rule: a ticket costs 50 for children under 9, and 100 for everyone else.
   function price(age) {
     if (age < 9) {
       return 50;
     }
     return 100;
   }
   Test 1: price(6) → expected 50
   Test 2: price(12) → expected 100
   Test 3: price(9) → expected 100
5. 5.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 52 px tall
   Done button: 28 px tall
   Help button: 48 px tall
   Back button: 56 px tall (a) Back (b) Done (c) Help (d) Cancel
6. 6.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
   1. tap the Lessons tab
   2. open “Score card”
   3. open “Video”
   Which screen are you on now? (a) Lessons (b) Score card (c) Quiz (d) Video
7. 7.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let score = 41; // start at 41
   line 2: score = score + 2; // double it
   line 3: score = score + 2; // add 2
   line 4: show(score); // show it (a) line 2 (b) line 3 (c) line 1
8. 8.Which of these is true of an app? (a) opens in a web browser (b) needs no installing (c) opens from a link (d) has a home-screen icon
9. 9.🚀 Your app is at version 4.8.6. The next release fixes a small bug. What is its version number? (a) 4.9.6 (b) 5.0.0 (c) 4.8.7 (d) 4.9.0
10. 10.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    no quiet study place: 8 votes
    forgetting birthdays: 4 votes
    wasting pocket money: 20 votes (a) no quiet study place (b) wasting pocket money (c) forgetting birthdays
11. 11.🔁 What number does this code show?
    let scores = [19, 9, 15, 1, 10];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
12. 12.🔢 In a quiz-app flow, which comes FIRST? (a) read a question (b) see the final score (c) tap “Start quiz” (d) pick an answer
13. 13.🔀 In a good flow, each screen should lead to ___. (a) a dead end (b) a random page (c) a clear next step (d) the same screen
14. 14.Which of these app ideas solves no real problem? (a) a lost-and-found board (b) a button with no action (c) a free study-room finder (d) a medicine reminder
15. 15.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Me tab
    2. open “Friend list”
    3. tap the Me tab
    How many times must you tap Back to reach the main screen of this tab?
16. 16.True or false: a finger hits Like is a load event. (a) True (b) False
17. 17.👆 Code that runs when an event happens is called a ___. (a) handler (b) headline (c) header (d) hashtag
18. 18.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
19. 19.🎯 Which app would help this user most: a cook with no idea for dinner? (a) a big-text reader (b) a recipe finder (c) a pocket-money tracker (d) a bus tracker
20. 20.🧪 How many of these test cases pass?
    📝 Rule: a quiz is passed with 7 or more right answers.
    function result(right) {
      if (right >= 7) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(12) → expected Pass
    Test 2: result(4) → expected Try again
    Test 3: result(9) → expected Pass
21. 21.♿ Accessibility means an app works for ___. (a) nobody (b) only the coder (c) only experts (d) everyone
22. 22.🗒️ You are planning version 1 of a quiz app. Which feature can WAIT for a later version? (a) show a question (b) background music (c) show the score (d) check the answer
23. 23.🎯 Is this a user need or a feature: “What should I cook?”? (a) a feature (b) a user need
24. 24.Which of these is true of a wireframe? (a) looks like the real app (b) shows the real fonts (c) uses plain grey boxes (d) uses the final pictures
25. 25.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 12, and 100 for everyone else.
    function price(age) {
      if (age <= 12) {
        return 50;
      }
      return 100;
    }
    Test 1: price(18) → expected 100
    Test 2: price(12) → expected 100
    Test 3: price(10) → expected 50 (a) Test 1 (b) Test 3 (c) Test 2
26. 26.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 2 (b) line 1 (c) line 3
27. 27.🔀 What number does this shop app show?
    let total = 770;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
28. 28.🔢 When you make an app, what comes right after “plan the screens”? (a) test the app (b) get an idea (c) build the app (d) release it
29. 29.Which of these is true of a final design? (a) has no real colours (b) uses the final pictures (c) shows where things go (d) uses plain grey boxes
30. 30.✏️ Is this true of a wireframe or of a final design: has no real colours? (a) a final design (b) a wireframe
31. 31.True or false: a tiny 20 px button is good button design. (a) True (b) False
32. 32.True or false: an app opens in a web browser. (a) False (b) True
33. 33.True or false: how fast a task is done is about UI (the look). (a) True (b) False
34. 34.🔁 What is the LAST line this code shows?
    let names = ["Arjun", "Zoya", "Aman", "Meera"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Arjun (b) Hi, Zoya (c) Hi, Meera (d) Hi, Aman
35. 35.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Video”
    2. tap Back
    3. open “Badges”
    4. tap the Chat tab
    5. open “Badges”
    Which screen are you on now? (a) Video (b) Chat (c) Badges (d) Feed
36. 36.🧩 How many buttons does this app screen have?
    [title] Settings
    [text box] City
    [button] Cancel
37. 37.Which colour pair is easy to read? (a) dark blue on black (b) light grey on white (c) pale pink on white (d) white on black
38. 38.🔍 Which is the odd one out? (a) draw the user flow (b) put it on an app store (c) sketch the screens (d) pick the features
39. 39.🔢 In a food-order flow, which comes LAST? (a) open the menu (b) pick a dish (c) add it to the cart (d) track the order
40. 40.🗒️ You are planning version 1 of a bus tracker. Which feature is a MUST-HAVE? (a) a dark mode (b) rate the driver (c) change the bus icon (d) pick your bus stop

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