App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 266 · 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.True or false: a recipe finder is the best fit for a teen learning to make snacks. (a) False (b) True
2. 2.⚙️ What number does this app show?
   let price = 270; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
3. 3.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let stars = 45; // start at 45
   line 2: stars = stars + 3; // add 3
   line 3: stars = stars + 2; // double it
   line 4: show(stars); // show it
4. 4.🔢 In a food-order flow, which comes first: “open the menu” or “add it to the cart”? (a) add it to the cart (b) open the menu
5. 5.🔁 What number does this code show?
   let runs = [12, 17, 20, 4];
   let best = 0;
   for (let i = 0; i < runs.length; i++) {
     if (runs[i] > best) {
       best = runs[i];
     }
   }
   show(best);
6. 6.👆 Two designs for the same task (each arrow is one tap). How many taps does Design A need?
   Design A: Home → Search → Cart → Address → Item → Confirm → Shop
   Design B: Home → Shop → Address → Offers
7. 7.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let score = 39; // start at 39
   line 2: score = score + 6; // add 6
   line 3: score = score + 2; // add 2
   line 4: score = score + 2; // double it
   line 5: show(score); // show it (a) line 2 (b) line 4 (c) line 1 (d) line 3
8. 8.✏️ Is this true of a wireframe or of a final design: uses plain grey boxes? (a) a final design (b) a wireframe
9. 9.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 330; // typed by the user
   line 2: let off = 50; // typed by the user
   line 3: let pay = price - off;
   line 4: show(pay); (a) line 2 (b) line 3 (c) line 4 (d) line 1
10. 10.True or false: a final design is a quick sketch. (a) True (b) False
11. 11.Which of these is a button? (a) a box to type a name (b) tap to go Next (c) the game-over page (d) your high score
12. 12.🗂️ What kind of app is a flashcard trainer? (a) a health app (b) a game (c) a learning app (d) a tool app
13. 13.🔢 In a food-order flow, what comes right after “open the menu”? (a) track the order (b) check the cart (c) add it to the cart (d) pick a dish
14. 14.Which of these requests asks for too much? (a) camera app → camera (b) map app → location (c) quiz app → microphone (d) calling app → contacts
15. 15.🔢 In a food-order flow, which comes FIRST? (a) open the menu (b) add it to the cart (c) pick a dish (d) pay for the order
16. 16.🔁 What is the LAST line this code shows?
    let names = ["Kabir", "Riya", "Arjun", "Meera", "Aman"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Arjun (b) Hi, Riya (c) Hi, Aman (d) Hi, Kabir
17. 17.Which of these is true of an app? (a) has a web address (b) opens from a link (c) needs no installing (d) updates from the store
18. 18.✏️ Is this true of a wireframe or of a final design: shows the real fonts? (a) a final design (b) a wireframe
19. 19.True or false: icons with no meaning is good button design. (a) True (b) False
20. 20.🧪 What is the ACTUAL result of Test 3?
    🎟️ 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(13) → expected 100
    Test 2: price(15) → expected 100
    Test 3: price(9) → expected 50
21. 21.🔁 What is the LAST line this code shows?
    let names = ["Meera", "Arjun", "Kabir", "Aman", "Riya"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Meera (b) Hi, Kabir (c) Hi, Arjun (d) Hi, Riya
22. 22.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Badges”
    2. tap Back
    3. open “Help page”
    4. tap the Settings tab
    Which screen are you on now? (a) Help page (b) Settings (c) Feed (d) Badges
23. 23.🔐 A torch app asks for your contacts. What should you do? (a) share them all (b) deny it (c) post them online (d) allow it
24. 24.True or false: a bill splitter solves a real problem. (a) False (b) True
25. 25.💡 Does an app idea like a button with no action solve a real problem? (a) Yes (b) No
26. 26.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) set a due date (b) add a homework task (c) see tasks by day (d) share tasks to friends
27. 27.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 50;
    }
    show(fee(11) + fee(9));
28. 28.🔀 What does this battery rule show?
    let battery = 80;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Battery OK (b) Low battery
29. 29.🔁 What number does this code show?
    let scores = [77, 49, 72];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 40) {
        count = count + 1;
      }
    }
    show(count);
30. 30.👆 The user taps the button 3 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
31. 31.🧪 Values right at a limit, like age 12 for “under 12”, are called ___. (a) easy cases (b) phone cases (c) old cases (d) edge cases
32. 32.🔐 Which permission does a weather-near-me app really need? (a) the camera (b) location (c) the microphone (d) contacts
33. 33.🔍 Which is the odd one out? (a) the theme colours (b) the icon shapes (c) the screen layout (d) how easy sign-up is
34. 34.👆 The user types Zoya 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! (b) Well done, Zoya! (c) Well done, nameBox.text! (d) Zoya
35. 35.🧪 A test fails when ___. (a) actual is not expected (b) the font is big (c) the app is new (d) both are the same
36. 36.📅 An app team plans for 5 days, builds for 8 days, tests for 2 days and releases on 1 more day. How many days does the whole project take?
37. 37.Which colour pair is hard to read? (a) white on dark green (b) black on pale grey (c) dark blue on white (d) pale pink on white
38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 28 px tall
    Start button: 64 px tall
    Back button: 60 px tall
    Help button: 52 px tall (a) Help (b) Back (c) Save (d) Start
39. 39.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Item → Pens
    Design B: Home → Item → Pens → Address
40. 40.True or false: “colour as the only clue” helps everyone use the app. (a) True (b) False

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