App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 350 · 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 does it ACTUALLY show?
   line 1: let stars = 49; // start at 49
   line 2: stars = stars + 3; // add 3
   line 3: stars = stars * 3; // double it
   line 4: stars = stars - 5; // take away 5
   line 5: show(stars); // show it
2. 2.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
   Footer: 21 px
   Hint: 22 px
   Title: 13 px
3. 3.🔁 What does a loop do? (a) deletes code (b) draws icons (c) saves photos (d) repeats code
4. 4.🔍 Which is the odd one out? (a) spot a problem to solve (b) list what users need (c) talk to possible users (d) add the buttons
5. 5.🧪 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(300) → expected 0
   Test 2: delivery(350) → expected 0
   Test 3: delivery(200) → expected 40
6. 6.Which of these app ideas solves a real problem? (a) a blank grey screen (b) a button with no action (c) a library due-date alert (d) an app that just says hi
7. 7.📱 The word “app” is short for ___. (a) apparatus (b) appetite (c) application (d) appointment
8. 8.👆 What kind of event is this: a 5-minute alarm ends? (a) a tap event (b) a load event (c) a timer event (d) a text event
9. 9.🔢 In a photo-post flow, which comes first: “post the photo” or “take the photo”? (a) post the photo (b) take the photo
10. 10.🔍 Which is the odd one out? (a) a cricket run chase (b) a word battle (c) a unit converter (d) a puzzle with levels
11. 11.🎯 What is the best first step to learn what users need? (a) write the code (b) guess on your own (c) pick the colours (d) ask and watch users
12. 12.🔁 A loop over a list of 5 items runs its body how many times? (a) 1 (b) 5 (c) 6 (d) 4
13. 13.💾 What number does this code show?
    let songs = ["Ocean", "Stars", "Rain", "Monsoon"];
    songs.push("Sunrise");
    songs.push("Kites");
    show(songs.length);
14. 14.👆 The user taps the button 6 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
15. 15.True or false: checking a password is processing. (a) True (b) False
16. 16.True or false: a recipe finder is the best fit for a teen learning to make snacks. (a) True (b) False
17. 17.🧪 What is the ACTUAL result of Test 3?
    🚚 Rule: delivery is free (0) when the order is 600 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 600) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(800) → expected 0
    Test 2: delivery(450) → expected 40
    Test 3: delivery(600) → expected 0
18. 18.🗒️ What is a must-have feature? (a) one the app cannot skip (b) a nice extra (c) a colour theme (d) a sound effect
19. 19.Which of these is a user need? (a) a dark mode switch (b) a search bar (c) “Small text is hard” (d) a reminder alarm
20. 20.👆 The user taps the button 5 times. What number does the label show now?
    let points = 6;
    button.onTap = function () {
      points = points + 4;
      label.text = points;
    };
21. 21.Which of these is true of a tab bar? (a) hides extra links (b) opens a list of pages (c) sits at the bottom (d) goes to the last screen
22. 22.📊 Survey: which problem bugs you most? How many more votes did “forgetting homework” get than “missing the bus”?
    forgetting homework: 11 votes
    missing the bus: 8 votes
    losing water bottles: 19 votes
23. 23.🧪 How many of these test cases pass?
    📝 Rule: a quiz is passed with 6 or more right answers.
    function result(right) {
      if (right >= 6) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(3) → expected Try again
    Test 2: result(7) → expected Pass
    Test 3: result(6) → expected Pass
24. 24.📊 Survey: which problem bugs you most? How many more votes did “no quiet study place” get than “missing the bus”?
    losing water bottles: 11 votes
    missing the bus: 8 votes
    no quiet study place: 22 votes
25. 25.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 50; // start at 50
    line 2: score = score * 2; // double it
    line 3: score = score - 2; // add 2
    line 4: score = score - 4; // take away 4
    line 5: show(score); // show it
26. 26.💾 Where should the app save a class leaderboard: on the phone or in the cloud? (a) on the phone (b) in the cloud
27. 27.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the screen turns off (c) the phone is lost (d) the app is closed
28. 28.🔢 In a sign-up flow, what comes right after “tap “Sign up””? (a) open the app (b) make a password (c) enter the code sent (d) type name and email
29. 29.👥 A library app has 215 readers, 55 librarians and 20 volunteers as users. How many users does it have in all?
30. 30.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 8, and 100 for everyone else.
    function price(age) {
      if (age <= 8) {
        return 50;
      }
      return 100;
    }
    Test 1: price(5) → expected 50
    Test 2: price(8) → expected 100
    Test 3: price(12) → expected 100 (a) Test 2 (b) Test 1 (c) Test 3
31. 31.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Footer: 17 px
    Body text: 23 px
    Hint: 13 px
    Caption: 17 px (a) Footer (b) Body text (c) Caption (d) Hint
32. 32.True or false: you connect the data at the build stage. (a) True (b) False
33. 33.⚙️ What number does this app show?
    let price = 20; // typed by the user
    let qty = 5; // typed by the user
    let total = price * qty;
    show(total);
34. 34.🐞 Finding and fixing bugs is called ___. (a) decorating (b) designing (c) debugging (d) downloading
35. 35.True or false: an app that just says hi solves a real problem. (a) False (b) True
36. 36.Which of these is an input? (a) a buzz (vibration) (b) sorting the scores (c) tapping a button (d) working out a tip
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 320; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 3 (c) line 4 (d) line 2
38. 38.🔘 Is this good or poor button design: grey text on grey? (a) good design (b) poor design
39. 39.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 5 or more right answers.
    function result(right) {
      if (right > 5) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(5) → expected Pass
    Test 2: result(7) → expected Pass
    Test 3: result(2) → expected Try again (a) Test 2 (b) Test 1 (c) Test 3
40. 40.🔀 Why plan the user flow before building? (a) to add more taps (b) to skip testing (c) so each step is clear (d) to hide the buttons

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