App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 528 · 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.🧪 How many of these test cases pass?
   🚚 Rule: delivery is free (0) when the order is 800 or more; otherwise it costs 40.
   function delivery(total) {
     if (total >= 800) {
       return 0;
     }
     return 40;
   }
   Test 1: delivery(950) → expected 0
   Test 2: delivery(750) → expected 40
   Test 3: delivery(800) → expected 0
2. 2.📊 Survey: which problem bugs you most? Which problem should your app solve first?
   forgetting birthdays: 17 votes
   no quiet study place: 9 votes
   losing water bottles: 18 votes (a) forgetting birthdays (b) losing water bottles (c) no quiet study place
3. 3.True or false: a wireframe shows the real fonts. (a) True (b) False
4. 4.💡 Which app idea solves this problem: projects pile up at once? (a) a lost-and-found board (b) a study-room finder (c) a medicine reminder (d) a homework planner
5. 5.✏️ Is this true of a wireframe or of a final design: uses the final pictures? (a) a final design (b) a wireframe
6. 6.🔢 In a sign-up flow, what comes right after “type name and email”? (a) tap “Sign up” (b) see the home screen (c) enter the code sent (d) make a password
7. 7.📅 An app team plans for 2 days, builds for 5 days, tests for 3 days and releases on 1 more day. Planning starts on day 1. On which day does building finish?
8. 8.🧪 One test case fails. Which one?
   🎟️ 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(9) → expected 50
   Test 2: price(10) → expected 100
   Test 3: price(14) → expected 100 (a) Test 3 (b) Test 2 (c) Test 1
9. 9.👆 “On tap → do this” links an event to ___. (a) a font (b) an action (c) a charger (d) a web address
10. 10.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 13, and 100 for everyone else.
    function price(age) {
      if (age <= 13) {
        return 50;
      }
      return 100;
    }
    Test 1: price(17) → expected 100
    Test 2: price(16) → expected 100
    Test 3: price(11) → expected 50
11. 11.👆 The user types Riya in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Hi, " + nameBox.text + "!";
    }; (a) Hi! (b) Hi, nameBox.text! (c) Hi, Riya! (d) Riya
12. 12.👆 The user taps the button 4 times. What number does the label show now?
    let lives = 9;
    button.onTap = function () {
      lives = lives + 5;
      label.text = lives;
    };
13. 13.True or false: a unit converter is a health app. (a) True (b) False
14. 14.🔁 Why use a loop to show 100 messages? (a) it is slower (b) less code to write (c) it hides them (d) it uses more lines
15. 15.🧪 How many of these test cases pass?
    📝 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(11) → expected Pass
    Test 2: result(10) → expected Pass
    Test 3: result(6) → expected Try again
16. 16.🐞 Finding and fixing bugs is called ___. (a) debugging (b) downloading (c) designing (d) decorating
17. 17.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 41; // start at 41
    line 2: lives = lives * 3; // double it
    line 3: lives = lives - 1; // take away 1
    line 4: show(lives); // show it
18. 18.🔍 Which is the odd one out? (a) tiny tap areas (b) labels on every icon (c) text that can grow (d) captions on videos
19. 19.💡 How can you check that people really have the problem? (a) copy another app (b) ask possible users (c) just guess (d) pick a colour
20. 20.True or false: “captions on videos” makes the app harder to use. (a) False (b) True
21. 21.True or false: a library due-date alert solves no real problem. (a) True (b) False
22. 22.🔢 In a sign-up flow, which comes first: “see the home screen” or “type name and email”? (a) type name and email (b) see the home screen
23. 23.📱 The word “app” is short for ___. (a) appetite (b) appointment (c) application (d) apparatus
24. 24.🔢 In a food-order flow, what comes right after “add it to the cart”? (a) open the menu (b) check the cart (c) pay for the order (d) pick a dish
25. 25.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 11, and 100 for everyone else.
    function price(age) {
      if (age <= 11) {
        return 50;
      }
      return 100;
    }
    Test 1: price(16) → expected 100
    Test 2: price(11) → expected 100
    Test 3: price(10) → expected 50 (a) Test 3 (b) Test 1 (c) Test 2
26. 26.🔢 After an app is released, what comes right after “list what to fix”? (a) read user reviews (b) test it again (c) fix and improve (d) release an update
27. 27.🔍 Which is the odd one out? (a) checking a password (b) a result on screen (c) working out a tip (d) adding up a bill
28. 28.True or false: a big, easy tap area is good button design. (a) False (b) True
29. 29.🔁 What number does this code show?
    let scores = [18, 7, 20, 16, 12];
    let best = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] > best) {
        best = scores[i];
      }
    }
    show(best);
30. 30.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 30;
    }
    show(fee(3) + fee(7));
31. 31.💡 Which app idea solves this problem: pupils forget due dates? (a) a study-room finder (b) a homework planner (c) a medicine reminder (d) a bill splitter
32. 32.🔁 What number does this code show?
    let steps = [15, 20, 2, 3, 18];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
33. 33.🧰 Why write a function? (a) to make code longer (b) to slow the app (c) to reuse code (d) to hide errors
34. 34.🔀 What does this sign-up rule show?
    let age = 15;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Ask a parent (b) Welcome!
35. 35.🔔 What is a message an app shows on your lock screen called? (a) a variable (b) a notification (c) a web address (d) a wireframe
36. 36.📊 Survey: which problem bugs you most? How many more votes did “losing water bottles” get than “no quiet study place”?
    losing water bottles: 15 votes
    forgetting birthdays: 13 votes
    no quiet study place: 12 votes
37. 37.🔀 What number does this shop app show?
    let total = 540;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
38. 38.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let points = 40; // start at 40
    line 2: points = points + 4; // add 4
    line 3: points = points - 3; // take away 3
    line 4: points = points * 3; // double it
    line 5: show(points); // show it
39. 39.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) earn stickers (b) add a homework task (c) share tasks to friends (d) pick a theme colour
40. 40.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 13; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students