App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 567 · 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 app idea solves this problem: Grandpa forgets his tablets? (a) a bill splitter (b) a medicine reminder (c) a homework planner (d) a study-room finder
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 15; // typed by the user
   line 2: let qty = 6; // typed by the user
   line 3: let total = price * qty;
   line 4: show(total); (a) line 3 (b) line 2 (c) line 4 (d) line 1
3. 3.🧪 One test case fails. Which one?
   🎟️ Rule: a ticket costs 50 for children under 14, and 100 for everyone else.
   function price(age) {
     if (age <= 14) {
       return 50;
     }
     return 100;
   }
   Test 1: price(14) → expected 100
   Test 2: price(10) → expected 50
   Test 3: price(16) → expected 100 (a) Test 2 (b) Test 1 (c) Test 3
4. 4.🔁 What number does this code show?
   let steps = [69, 81, 79];
   let count = 0;
   for (let i = 0; i < steps.length; i++) {
     if (steps[i] >= 70) {
       count = count + 1;
     }
   }
   show(count);
5. 5.🖼️ In this wireframe (top to bottom), what is right below the top bar?
   [ top bar ]
   [ filter buttons ]
   [ big picture ]
   [ menu icon ]
   [ Save button ] (a) big picture (b) Save button (c) filter buttons (d) menu icon
6. 6.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Save button: 44 px tall
   Cancel button: 64 px tall
   Start button: 52 px tall
   Help button: 48 px tall (a) Cancel (b) Start (c) Save (d) Help
7. 7.🧪 How many of these test cases pass?
   📝 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(3) → expected Try again
   Test 2: result(5) → expected Pass
   Test 3: result(7) → expected Pass
8. 8.True or false: strong colour contrast is poor button design. (a) True (b) False
9. 9.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) pick your bus stop (b) a dark mode (c) see where the bus is (d) show arrival time
10. 10.🗒️ Version 1 of a water reminder must be ready in 11 days. How many days are left for extras after the must-haves?
    set a reminder time: 2 days
    log a glass of water: 4 days
    see today’s total: 5 days
11. 11.🔁 A loop over a list of 5 items runs its body how many times? (a) 6 (b) 1 (c) 5 (d) 4
12. 12.🔀 What is a user flow? (a) a type of font (b) a charging cable (c) the path through screens (d) a colour theme
13. 13.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
14. 14.📊 Survey: which problem bugs you most? How many more votes did “losing water bottles” get than “missing the bus”?
    losing water bottles: 24 votes
    missing the bus: 23 votes
    forgetting birthdays: 12 votes
15. 15.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Footer: 21 px
    Body text: 23 px
    Hint: 22 px
    Caption: 28 px
    Menu: 13 px (a) Hint (b) Body text (c) Footer (d) Menu
16. 16.🧩 Which input is best for typing your name? (a) a slider (b) a text box (c) a picture (d) a switch
17. 17.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) savings stickers (b) add money spent (c) export to a file (d) pie-chart colours
18. 18.Which of these app ideas solves a real problem? (a) a button with no action (b) a blank grey screen (c) a bill splitter (d) an app that just says hi
19. 19.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Label: 19 px
    Footer: 13 px
    Body text: 10 px
20. 20.🔢 When you make an app, which comes first: “plan the screens” or “get an idea”? (a) get an idea (b) plan the screens
21. 21.📅 An app team plans for 2 days, builds for 10 days, tests for 1 days and releases on 1 more day. How many days does the whole project take?
22. 22.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting homework: 10 votes
    missing the bus: 4 votes
    forgetting birthdays: 11 votes (a) missing the bus (b) forgetting homework (c) forgetting birthdays
23. 23.👆 The user taps the button 1 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
24. 24.Which of these is a user need? (a) a share button (b) a reminder alarm (c) “What should I cook?” (d) a search bar
25. 25.🧩 In an app, what is the settings page? (a) data (b) a screen (c) an input (d) a button
26. 26.🎯 An app for “everyone” with no clear user usually ___. (a) needs no testing (b) helps nobody well (c) is easy to build (d) wins every prize
27. 27.🧪 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(12) → expected 100
    Test 2: price(6) → expected 50
    Test 3: price(10) → expected 100 (a) Test 2 (b) Test 3 (c) Test 1
28. 28.🔁 What number does this code show?
    let runs = [9, 4, 5, 20, 13];
    let best = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] > best) {
        best = runs[i];
      }
    }
    show(best);
29. 29.🔁 What number does this code show?
    let scores = [18, 2, 11, 14];
    let best = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] > best) {
        best = scores[i];
      }
    }
    show(best);
30. 30.🔀 What does this sign-up rule show?
    let age = 9;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Ask a parent (b) Welcome!
31. 31.👆 The user taps the button 4 times. What number does the label show now?
    let score = 1;
    button.onTap = function () {
      score = score + 1;
      label.text = score;
    };
32. 32.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(4) + points(4));
33. 33.♿ Does this help everyone, or make the app harder to use: icons with no labels? (a) makes it harder (b) helps everyone
34. 34.🔢 In a food-order flow, what comes right after “check the cart”? (a) pay for the order (b) pick a dish (c) track the order (d) open the menu
35. 35.🔍 Which is the odd one out? (a) sketch the screens (b) spot a problem to solve (c) talk to possible users (d) list what users need
36. 36.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Cart → Address → Shop → Pay → Menu
    Design B: Home → Results → Confirm → Shop → Search → Cart → Menu (a) Design A (b) Design B
37. 37.👆 The user taps the button 5 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) ON (b) OFF
38. 38.📱 The word “app” is short for ___. (a) apparatus (b) application (c) appetite (d) appointment
39. 39.🚀 Which version is newer: 2.4.5 or 2.4.16? (a) 2.4.16 (b) 2.4.5
40. 40.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let coins = 38; // start at 38
    line 2: coins = coins + 2; // add 2
    line 3: coins = coins + 1; // take away 1
    line 4: coins = coins * 2; // double it
    line 5: show(coins); // show it (a) line 2 (b) line 1 (c) line 4 (d) line 3

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