App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 653 · 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.🗒️ A to-do app with no “add a task” feature is ___. (a) a nice extra (b) well planned (c) missing a must-have (d) ready to release
2. 2.🔍 Which is the odd one out? (a) how many taps it takes (b) how fast a task is done (c) whether users get lost (d) the font size
3. 3.🔀 What does this sign-up rule show?
   let age = 13;
   if (age >= 13) {
     show("Welcome!");
   } else {
     show("Ask a parent");
   } (a) Welcome! (b) Ask a parent
4. 4.✏️ Is this true of a wireframe or of a final design: shows where things go? (a) a final design (b) a wireframe
5. 5.🔀 A screen with no way forward or back is called a ___. (a) shortcut (b) dead end (c) tab bar (d) home screen
6. 6.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
   1. open “Help page”
   2. open “Friend list”
   3. tap the Profile tab
   4. tap the Search tab
   How many times must you tap Back to reach the main screen of this tab?
7. 7.🔀 What does this PIN rule show?
   let pin = "360";
   if (pin.length === 4) {
     show("PIN saved");
   } else {
     show("Use 4 digits");
   } (a) Use 4 digits (b) PIN saved
8. 8.🔢 In a quiz-app flow, what comes right after “tap “Start quiz””? (a) see the final score (b) see if it is right (c) read a question (d) pick an answer
9. 9.True or false: an app that just says hi solves a real problem. (a) False (b) True
10. 10.🔁 What number does this code show?
    let scores = [68, 27, 37];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 50) {
        count = count + 1;
      }
    }
    show(count);
11. 11.True or false: a beep sound is an output. (a) False (b) True
12. 12.🔁 A loop over a list of 5 items runs its body how many times? (a) 6 (b) 4 (c) 5 (d) 1
13. 13.🧪 How many of these test cases pass?
    🎟️ 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(14) → expected 100
    Test 2: price(15) → expected 100
    Test 3: price(11) → expected 50
14. 14.Which of these is a feature? (a) a search bar (b) “Small text is hard” (c) “I keep missing the bus” (d) “I forget my homework”
15. 15.🔀 What does this sign-up rule show?
    let age = 10;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
16. 16.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let coins = 31; // start at 31
    line 2: coins = coins * 2; // double it
    line 3: coins = coins * 3; // double it
    line 4: coins = coins - 3; // take away 3
    line 5: show(coins); // show it
17. 17.True or false: your friends list is an input. (a) True (b) False
18. 18.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(25, 2));
19. 19.🧩 In an app, what is the home page of an app? (a) an input (b) a button (c) a screen (d) data
20. 20.Which of these makes the app harder to use? (a) big touch targets (b) labels on every icon (c) fast-flashing lights (d) strong colour contrast
21. 21.🗒️ In MVP, the M stands for ___. (a) maximum (b) mobile (c) music (d) minimum
22. 22.Which of these is true of a menu button? (a) hides extra links (b) sits at the bottom (c) switches main sections (d) undoes one move
23. 23.True or false: a blank grey screen solves a real problem. (a) True (b) False
24. 24.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let points = 36; // start at 36
    line 2: points = points + 4; // take away 4
    line 3: points = points + 2; // add 2
    line 4: points = points + 6; // add 6
    line 5: show(points); // show it (a) line 2 (b) line 3 (c) line 4 (d) line 1
25. 25.🧪 What is the ACTUAL result of Test 1?
    🎟️ 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(9) → expected 100
    Test 2: price(6) → expected 50
    Test 3: price(12) → expected 100
26. 26.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Title: 10 px
    Label: 14 px
    Hint: 11 px
27. 27.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    missing the bus: 19 votes
    wasting pocket money: 11 votes
    forgetting homework: 3 votes (a) forgetting homework (b) missing the bus (c) wasting pocket money
28. 28.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) earn stickers (b) pick a theme colour (c) set a due date (d) share tasks to friends
29. 29.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) set a reminder time (b) log a glass of water (c) custom alert sounds (d) see today’s total
30. 30.⚙️ What number does this app show?
    let price = 160; // typed by the user
    let off = 10; // typed by the user
    let pay = price - off;
    show(pay);
31. 31.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 10, and 100 for everyone else.
    function price(age) {
      if (age <= 10) {
        return 50;
      }
      return 100;
    }
    Test 1: price(16) → expected 100
    Test 2: price(10) → expected 100
    Test 3: price(8) → expected 50
32. 32.🔢 After an app is released, which comes FIRST? (a) fix and improve (b) read user reviews (c) list what to fix (d) test it again
33. 33.👆 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;
    };
34. 34.✏️ Why draw a wireframe before coding? (a) it runs the app (b) changes are quick (c) it adds colours (d) it saves data
35. 35.🧰 How do you run (call) a function called greet? (a) greet[] (b) run greet (c) #greet (d) greet()
36. 36.🚀 A change from version 1.4.2 to 1.4.3 usually means ___. (a) a bug fix (b) a new app (c) a big redesign (d) a new feature
37. 37.🧪 What is the ACTUAL result of Test 3?
    🚚 Rule: delivery is free (0) when the order is 300 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 300) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(200) → expected 40
    Test 2: delivery(600) → expected 0
    Test 3: delivery(650) → expected 0
38. 38.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
39. 39.🧭 Tapping a tab usually takes you to ___. (a) the phone settings (b) a random page (c) the last app used (d) that tab’s main screen
40. 40.🧩 In an app, what is your friends list? (a) a button (b) a screen (c) an input (d) data

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