App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 112 · 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 total(price, qty) {
     return price * qty;
   }
   show(total(95, 5));
2. 2.True or false: how easy sign-up is is about UX (the experience). (a) True (b) False
3. 3.🧩 How many buttons does this app screen have?
   [title] Add Homework
   [button] Back
   [text box] Name
   [slider] Text size
   [button] Done
   [text box] Age
4. 4.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
5. 5.Which of these is true of a wireframe? (a) looks like the real app (b) is a quick sketch (c) shows the real fonts (d) has the real colours
6. 6.True or false: icons with no meaning is good button design. (a) True (b) False
7. 7.🎨 UI stands for user ___. (a) input (b) internet (c) interface (d) idea
8. 8.⚙️ In an app, is speaking a command an input, processing or an output? (a) output (b) input (c) processing
9. 9.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
   [title] Edit Profile
   [button] Send
   [text box] Notes
   [button] Done
   [button] Back
   [switch] Dark mode
   [text box] Age
10. 10.🧩 In an app, what is your friends list? (a) a button (b) a screen (c) an input (d) data
11. 11.🧩 In an app, what is the log-in page? (a) a button (b) an input (c) data (d) a screen
12. 12.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 45; // start at 45
    line 2: coins = coins + 7; // add 5
    line 3: coins = coins + 4; // add 4
    line 4: show(coins); // show it
13. 13.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) pick a theme colour (b) earn stickers (c) share tasks to friends (d) set a due date
14. 14.🛠️ At which stage do you list what users need? (a) the plan stage (b) the idea stage (c) the test stage (d) the build stage
15. 15.🔘 Our rule: buttons are at least 48 px tall. The Start button is 24 px tall. How many px taller must it be?
16. 16.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) in the cloud (b) on the phone
17. 17.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 33; // start at 31
    line 2: lives = lives + 4; // add 4
    line 3: lives = lives * 2; // double it
    line 4: show(lives); // show it (a) line 2 (b) line 3 (c) line 1
18. 18.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(13));
19. 19.📲 What happens when you tap an app’s icon? (a) the sound turns off (b) the phone charges (c) the app opens (d) the app is deleted
20. 20.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 35; // start at 35
    line 2: score = score + 2; // double it
    line 3: score = score - 3; // take away 3
    line 4: show(score); // show it
21. 21.🔢 In a sign-up flow, which comes LAST? (a) tap “Sign up” (b) see the home screen (c) make a password (d) open the app
22. 22.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let points = 41; // start at 38
    line 2: points = points - 4; // take away 4
    line 3: points = points - 4; // take away 4
    line 4: show(points); // show it
23. 23.🔍 Which is the odd one out? (a) how easy sign-up is (b) whether users get lost (c) the screen layout (d) how users feel after
24. 24.True or false: “tiny tap areas” makes the app harder to use. (a) False (b) True
25. 25.True or false: the font size is about UI (the look). (a) False (b) True
26. 26.✏️ A box with a cross in a wireframe usually means ___. (a) an error (b) a closed app (c) delete this (d) a picture goes here
27. 27.True or false: the screen first opens is a timer event. (a) False (b) True
28. 28.🔁 What is the LAST line this code shows?
    let names = ["Riya", "Kabir", "Zoya"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Kabir (b) Hi, Riya (c) Hi, Zoya
29. 29.Which of these is a feature? (a) a dark mode switch (b) “What should I cook?” (c) “Small text is hard” (d) “I keep missing the bus”
30. 30.🔍 Which is the odd one out? (a) fast-flashing lights (b) sudden loud sounds (c) labels on every icon (d) tiny tap areas
31. 31.✏️ Why draw a wireframe before coding? (a) changes are quick (b) it adds colours (c) it runs the app (d) it saves data
32. 32.🧩 Scores, notes and settings that an app keeps are called ___. (a) screens (b) tabs (c) buttons (d) data
33. 33.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(10, 2));
34. 34.🎯 Which app would help this user most: a cook with no idea for dinner? (a) a big-text reader (b) a recipe finder (c) a pocket-money tracker (d) a water reminder
35. 35.💾 What does this code show? (Positions start at 0.)
    let songs = ["Ocean", "Stars", "Monsoon"];
    show(songs[0]); (a) Ocean (b) Stars (c) Monsoon
36. 36.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 300 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 300) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(350) → expected 0
    Test 2: delivery(300) → expected 0
    Test 3: delivery(200) → expected 40
37. 37.💾 What number does this code show?
    let notes = ["Maths", "Sports"];
    notes.push("Art");
    notes.push("Science");
    show(notes.length);
38. 38.⚙️ In an app, is tapping a button an input, processing or an output? (a) processing (b) input (c) output
39. 39.🗒️ You are planning version 1 of a water reminder. Which feature is a MUST-HAVE? (a) custom alert sounds (b) set a reminder time (c) share your streak (d) water animations
40. 40.🧪 How many of these test cases pass?
    🎟️ 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(7) → expected 50
    Test 2: price(12) → expected 100
    Test 3: price(9) → expected 100

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