App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 175 · 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(20, 6));
2. 2.True or false: you let friends try it at the release stage. (a) True (b) False
3. 3.🔁 What number does this code show?
   let marks = [14, 20, 6, 7];
   let total = 0;
   for (let i = 0; i < marks.length; i++) {
     total = total + marks[i];
   }
   show(total);
4. 4.True or false: you put it on an app store at the build stage. (a) True (b) False
5. 5.🗒️ You are planning version 1 of a quiz app. Which feature is a MUST-HAVE? (a) show a question (b) an avatar shop (c) background music (d) confetti effects
6. 6.👆 The user taps the button 3 times. What number does the label show now?
   let lives = 4;
   button.onTap = function () {
     lives = lives + 4;
     label.text = lives;
   };
7. 7.⚙️ What number does this app show?
   let bill = 30; // typed by the user
   let friends = 3; // typed by the user
   let share = bill / friends;
   show(share);
8. 8.👆 What kind of event is this: one second passes? (a) a tap event (b) a load event (c) a text event (d) a timer event
9. 9.True or false: a medicine reminder solves a real problem. (a) True (b) False
10. 10.🔀 What does this sign-up rule show?
    let age = 13;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
11. 11.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 450; // typed by the user
    line 2: let off = 10; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 3 (b) line 1 (c) line 4 (d) line 2
12. 12.🛠️ At which stage do you write down the bugs? (a) the test stage (b) the idea stage (c) the release stage (d) the build stage
13. 13.🛠️ At which stage do you share the download link? (a) the test stage (b) the plan stage (c) the release stage (d) the build stage
14. 14.🚀 A change from version 1.4.2 to 1.4.3 usually means ___. (a) a new app (b) a big redesign (c) a bug fix (d) a new feature
15. 15.🔀 In a good flow, each screen should lead to ___. (a) the same screen (b) a random page (c) a clear next step (d) a dead end
16. 16.🧰 What does this code show?
    function greet(name) {
      return "Hi, " + name + "!";
    }
    show(greet("Kabir")); (a) Hi, Kabir! (b) Hi, name! (c) Kabir (d) greet
17. 17.🎯 Is this a user need or a feature: a dark mode switch? (a) a feature (b) a user need
18. 18.🔍 Which is the odd one out? (a) a step counter (b) a sleep tracker (c) a water reminder (d) a calculator
19. 19.🔁 What is the LAST line this code shows?
    let names = ["Meera", "Arjun", "Kabir", "Zoya", "Aman"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Aman (b) Hi, Arjun (c) Hi, Meera (d) Hi, Kabir
20. 20.🎨 UX stands for user ___. (a) example (b) experience (c) express (d) extra
21. 21.True or false: taking a photo is an output. (a) False (b) True
22. 22.👆 The user taps the button 5 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 4) {
        likes = likes + 1;
      }
      label.text = likes;
    };
23. 23.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Address → Results → Pay → Pens → Shop
    Design B: Home → Offers → Pens → Size → Confirm → Pay → Menu
24. 24.🔀 Which badge does this quiz app show?
    let marks = 25;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Silver (b) Gold (c) Bronze
25. 25.♿ A screen has 7 icon buttons. Only 6 of them have a text label for screen readers. How many still need a label?
26. 26.🧪 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(10) → expected Pass
    Test 2: result(7) → expected Try again
    Test 3: result(8) → expected Pass
27. 27.True or false: a tiny 20 px button is poor button design. (a) True (b) False
28. 28.🔢 In a photo-post flow, what comes right after “open the camera screen”? (a) add a filter (b) write a caption (c) take the photo (d) post the photo
29. 29.🐞 Finding and fixing bugs is called ___. (a) debugging (b) designing (c) downloading (d) decorating
30. 30.Which of these is true of a wireframe? (a) uses the final pictures (b) has the real colours (c) uses plain grey boxes (d) looks like the real app
31. 31.💾 What does this code show? (Positions start at 0.)
    let notes = ["Hindi", "Maths", "Art", "Music"];
    show(notes[0]); (a) Maths (b) Music (c) Hindi (d) Art
32. 32.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) show arrival time (b) change the bus icon (c) see where the bus is (d) pick your bus stop
33. 33.📊 Survey: which problem bugs you most? How many students voted in all?
    no quiet study place: 23 votes
    losing water bottles: 8 votes
    forgetting homework: 20 votes
34. 34.🗒️ Version 1 of a bus tracker must be ready in 12 days. How many days are left for extras after the must-haves?
    see where the bus is: 3 days
    show arrival time: 2 days
    pick your bus stop: 5 days
35. 35.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(37));
36. 36.🧑 Who is an app really made for? (a) its users (b) its icon (c) its charger (d) its coder only
37. 37.True or false: the icon shapes is about UI (the look). (a) True (b) False
38. 38.True or false: a homework planner is the best fit for a pupil juggling five projects. (a) True (b) False
39. 39.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 50; // start at 48
    line 2: coins = coins - 3; // take away 3
    line 3: coins = coins - 1; // take away 1
    line 4: show(coins); // show it
40. 40.True or false: an app that just says hi solves a real problem. (a) True (b) False

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