App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 783 · 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 colour pair is hard to read? (a) pale pink on white (b) black on yellow (c) dark blue on white (d) white on black
2. 2.👆 An event in an app is ___. (a) an app store (b) a kind of list (c) a colour theme (d) something that happens
3. 3.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
4. 4.🔁 What number does this code show?
   let runs = [10, 2, 13];
   let best = 0;
   for (let i = 0; i < runs.length; i++) {
     if (runs[i] > best) {
       best = runs[i];
     }
   }
   show(best);
5. 5.🧪 One test case fails. Which one?
   🎟️ 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(15) → expected 100
   Test 3: price(5) → expected 50 (a) Test 2 (b) Test 1 (c) Test 3
6. 6.🐞 After fixing a bug you should ___. (a) delete the test (b) release at once (c) test it again (d) never test
7. 7.🎯 Why learn about users before you build? (a) to build what they need (b) to slow it down (c) to make it longer (d) to pick a logo
8. 8.🔢 After an app is released, which comes first: “release an update” or “list what to fix”? (a) release an update (b) list what to fix
9. 9.🔢 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
10. 10.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 8 or more right answers.
    function result(right) {
      if (right > 8) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(5) → expected Try again
    Test 2: result(10) → expected Pass
    Test 3: result(8) → expected Pass (a) Test 1 (b) Test 2 (c) Test 3
11. 11.🗒️ You are planning version 1 of a quiz app. Which feature is a MUST-HAVE? (a) an avatar shop (b) confetti effects (c) show the score (d) background music
12. 12.True or false: a final design shows where things go. (a) True (b) False
13. 13.🧰 What is a function? (a) a screen size (b) a type of phone (c) a list of colours (d) a named block of code
14. 14.🧪 What is the ACTUAL result of Test 2?
    🚚 Rule: delivery is free (0) when the order is 700 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 700) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(850) → expected 0
    Test 2: delivery(900) → expected 0
    Test 3: delivery(650) → expected 40
15. 15.🔁 What is the LAST line this code shows?
    let names = ["Meera", "Kabir", "Aman"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Kabir (b) Hi, Meera (c) Hi, Aman
16. 16.Which of these is an input? (a) checking a password (b) taking a photo (c) adding up a bill (d) working out a tip
17. 17.💡 Which app idea solves this problem: projects pile up at once? (a) a lost-and-found board (b) a medicine reminder (c) a study-room finder (d) a homework planner
18. 18.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) pick a theme colour (b) set a due date (c) see tasks by day (d) add a homework task
19. 19.👥 A school app has 65 students, 120 teachers and 195 parents as users. Which user group is the biggest? (a) students (b) teachers (c) parents
20. 20.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(11));
21. 21.🔢 In a food-order flow, what comes right after “open the menu”? (a) pay for the order (b) track the order (c) pick a dish (d) add it to the cart
22. 22.⚙️ In an app, is typing your age an input, processing or an output? (a) input (b) output (c) processing
23. 23.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(13));
24. 24.✏️ Is this true of a wireframe or of a final design: shows where things go? (a) a final design (b) a wireframe
25. 25.🔀 When does the else part run? (a) when the test is false (b) never (c) when the test is true (d) always
26. 26.✏️ Do wireframes usually show the final colours? (a) Yes (b) No
27. 27.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(15, 4));
28. 28.🗂️ What kind of app is a calculator? (a) a learning app (b) a health app (c) a game (d) a tool app
29. 29.🎯 Which app would help this user most: a teen learning to make snacks? (a) a big-text reader (b) a bus tracker (c) a homework planner (d) a recipe finder
30. 30.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 0, 1, 2, 3 (b) 3 (c) 1, 2, 3 (d) 0, 1, 2
31. 31.True or false: the user presses Save is a timer event. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) talk to possible users (b) put it on an app store (c) share the download link (d) write the store text
33. 33.🔁 What number does this code show?
    let marks = [66, 48, 63, 41];
    let count = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] >= 70) {
        count = count + 1;
      }
    }
    show(count);
34. 34.👆 The user types Riya in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Well done, " + nameBox.text + "!";
    }; (a) Well done, Riya! (b) Riya (c) Well done! (d) Well done, nameBox.text!
35. 35.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
36. 36.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Lessons tab
    2. open “Match report”
    3. tap Back
    4. open “Badges”
    5. tap Back
    How many times must you tap Back to reach the main screen of this tab?
37. 37.👆 The user taps the button 3 times. What number does the label show now?
    let score = 0;
    button.onTap = function () {
      score = score + 4;
      label.text = score;
    };
38. 38.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let points = 36; // start at 33
    line 2: points = points - 1; // take away 1
    line 3: points = points - 5; // take away 5
    line 4: show(points); // show it
39. 39.👥 A library app has 90 readers, 210 librarians and 295 volunteers as users. Which user group is the biggest? (a) volunteers (b) readers (c) librarians
40. 40.🧩 In an app, what is today’s step count? (a) a screen (b) data (c) a button (d) an input

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