App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 979 · 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.🧰 What number does this code show?
   function triple(n) {
     return n * 3;
   }
   show(triple(26));
2. 2.📱 Which one comes from an app store: an app or a website? (a) an app (b) a website
3. 3.💡 How can you check that people really have the problem? (a) ask possible users (b) pick a colour (c) copy another app (d) just guess
4. 4.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let stars = 47; // start at 44
   line 2: stars = stars + 4; // add 4
   line 3: stars = stars - 4; // take away 4
   line 4: stars = stars + 4; // add 4
   line 5: show(stars); // show it (a) line 2 (b) line 4 (c) line 1 (d) line 3
5. 5.🧪 How many of these test cases pass?
   🎟️ 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(17) → expected 100
   Test 2: price(13) → expected 50
   Test 3: price(14) → expected 100
6. 6.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) share tasks to friends (b) pick a theme colour (c) set a due date (d) earn stickers
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let price = 270; // 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 1 (b) line 4 (c) line 3 (d) line 2
8. 8.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
   1. tap the Quiz tab
   2. open “Match report”
   3. tap the Lessons tab
   4. tap the Lessons tab
   5. open “Match report”
   Which screen are you on now? (a) Me (b) Quiz (c) Lessons (d) Match report
9. 9.True or false: a torch is a game. (a) True (b) False
10. 10.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) processing (c) input
11. 11.True or false: icons with no meaning is good button design. (a) False (b) True
12. 12.True or false: you spot a problem to solve at the test stage. (a) True (b) False
13. 13.🔢 In a photo-post flow, which comes FIRST? (a) post the photo (b) add a filter (c) open the camera screen (d) write a caption
14. 14.🔢 In a quiz-app flow, which comes LAST? (a) pick an answer (b) see the final score (c) read a question (d) see if it is right
15. 15.🔁 Why use a loop to show 100 messages? (a) it is slower (b) it uses more lines (c) less code to write (d) it hides them
16. 16.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Results → Offers → Address → Menu
    Design B: Home → Address → Offers → Search → Cart → Menu → Pay (a) Design B (b) Design A
17. 17.👥 A school app has 160 students, 155 teachers and 225 parents as users. Which user group is the biggest? (a) parents (b) students (c) teachers
18. 18.👥 A clinic app has 105 patients, 260 doctors and 140 nurses as users. How many users does it have in all?
19. 19.🧩 Which of these is a button on this screen?
    [title] Add Homework
    [button] Send
    [text box] Age
    [text box] Subject
    [text box] City
    [button] Save (a) Subject (b) Save (c) Age (d) City
20. 20.Which of these is an input? (a) speaking a command (b) sorting the scores (c) a pop-up message (d) a buzz (vibration)
21. 21.🛠️ At which stage do you write down the bugs? (a) the build stage (b) the plan stage (c) the test stage (d) the idea stage
22. 22.🔁 What is the LAST line this code shows?
    let names = ["Riya", "Arjun", "Zoya", "Kabir"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Kabir (b) Hi, Zoya (c) Hi, Riya (d) Hi, Arjun
23. 23.🔀 What does this battery rule show?
    let battery = 33;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Battery OK (b) Low battery
24. 24.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
25. 25.Which of these is a button? (a) your high score (b) the game-over page (c) tap to go Next (d) your friends list
26. 26.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let score = 36; // start at 34
    line 2: score = score + 2; // add 2
    line 3: score = score - 2; // take away 2
    line 4: show(score); // show it
27. 27.🗒️ What is a must-have feature? (a) a colour theme (b) a nice extra (c) one the app cannot skip (d) a sound effect
28. 28.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 20;
    }
    show(fee(2) + fee(12));
29. 29.True or false: your high score is a button. (a) False (b) True
30. 30.🔘 Our rule: buttons are at least 48 px tall. The Send button is 24 px tall. How many px taller must it be?
31. 31.👥 A library app has 200 readers, 20 librarians and 70 volunteers as users. How many more readers than librarians are there?
32. 32.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. tap the Settings tab
    2. open “Match report”
    3. tap the Feed tab
    4. tap the Chat tab
    Which screen are you on now? (a) Settings (b) Feed (c) Match report (d) Chat
33. 33.🎯 A short made-up profile of a typical user is called a ___. (a) password (b) pixel (c) persona (d) protocol
34. 34.Which of these is true of an app? (a) is installed on a phone (b) opens in a web browser (c) needs no installing (d) opens from a link
35. 35.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Caption: 22 px
    Menu: 20 px
    Body text: 21 px
36. 36.💾 pop() takes off the last item. What does this code show?
    let friends = ["Arjun", "Riya", "Aman", "Meera", "Kabir"];
    friends.pop();
    show(friends[friends.length - 1]); (a) Aman (b) Arjun (c) Riya (d) Meera
37. 37.Which of these is true of a tab bar? (a) hides extra links (b) undoes one move (c) goes to the last screen (d) shows 3 to 5 icons
38. 38.🐞 After fixing a bug you should ___. (a) release at once (b) test it again (c) never test (d) delete the test
39. 39.🔢 In a food-order flow, which comes LAST? (a) track the order (b) open the menu (c) check the cart (d) pay for the order
40. 40.Which colour pair is hard to read? (a) white on dark green (b) yellow on white (c) dark blue on white (d) black on yellow

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