App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 372 · 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 kind of app is a torch? (a) a tool app (b) a learning app (c) a health app (d) a game
2. 2.🧰 What number does this code show?
   function triple(n) {
     return n * 3;
   }
   show(triple(15));
3. 3.🌐 Which program do you need to open a website? (a) a camera app (b) a calculator (c) a web browser (d) an app store
4. 4.True or false: how fast a task is done is about UI (the look). (a) True (b) False
5. 5.👆 The user taps the button 2 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
6. 6.💾 What is a variable? (a) a type of screen (b) a picture (c) a named box for a value (d) a phone setting
7. 7.👥 A clinic app has 185 patients, 155 doctors and 25 nurses as users. Which user group is the biggest? (a) nurses (b) doctors (c) patients
8. 8.Which of these app ideas solves no real problem? (a) a page of random dots (b) a lost-and-found board (c) a medicine reminder (d) a free study-room finder
9. 9.📅 An app team plans for 3 days, builds for 6 days, tests for 2 days and releases on 1 more day. How many days does the whole project take?
10. 10.🔁 What number does this code show?
    let runs = [83, 80, 35, 81];
    let count = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] >= 60) {
        count = count + 1;
      }
    }
    show(count);
11. 11.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting homework: 16 votes
    missing the bus: 23 votes
    wasting pocket money: 20 votes (a) wasting pocket money (b) missing the bus (c) forgetting homework
12. 12.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Match report”
    2. tap the Chat tab
    3. open “Score card”
    Which screen are you on now? (a) Feed (b) Match report (c) Chat (d) Score card
13. 13.🔍 Which is the odd one out? (a) a calculator (b) a unit converter (c) a torch (d) a water reminder
14. 14.True or false: the user presses Save is a tap event. (a) True (b) False
15. 15.✏️ A box with a cross in a wireframe usually means ___. (a) a picture goes here (b) a closed app (c) an error (d) delete this
16. 16.🔢 When you make an app, what comes right after “test the app”? (a) get an idea (b) release it (c) plan the screens (d) build the app
17. 17.Which of these is true of a wireframe? (a) uses the final pictures (b) shows the real fonts (c) shows where things go (d) looks like the real app
18. 18.💾 pop() takes off the last item. What does this code show?
    let notes = ["Science", "Hindi", "Art"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Art (b) Science (c) Hindi
19. 19.🔍 Which is the odd one out? (a) a beep sound (b) a result on screen (c) a pop-up message (d) typing your age
20. 20.🔀 What does this sign-up rule show?
    let age = 16;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Welcome! (b) Ask a parent
21. 21.True or false: a buzz (vibration) is an output. (a) True (b) False
22. 22.📱 Which one comes from an app store: an app or a website? (a) an app (b) a website
23. 23.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 40;
    }
    show(fee(8) + fee(6));
24. 24.True or false: tap to go Next is a screen. (a) True (b) False
25. 25.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(4) + points(0));
26. 26.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(70, 2));
27. 27.👆 Two designs for the same task (each arrow is one tap). How many taps does Design A need?
    Design A: Home → Confirm → Search → Offers
    Design B: Home → Pens → Search → Confirm → Cart → Menu
28. 28.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 500 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 500) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(400) → expected 40
    Test 2: delivery(650) → expected 0
    Test 3: delivery(750) → expected 0
29. 29.True or false: a wireframe shows where things go. (a) False (b) True
30. 30.🔘 Our rule: buttons are at least 48 px tall. The Next button is 24 px tall. How many px taller must it be?
31. 31.🧩 Which input is best for turning something ON or OFF? (a) a slider (b) a text box (c) a title (d) a switch
32. 32.👆 The user taps the button 7 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
33. 33.👥 A clinic app has 200 patients, 190 doctors and 155 nurses as users. How many more patients than nurses are there?
34. 34.👆 The user taps the button 7 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 4) {
        likes = likes + 1;
      }
      label.text = likes;
    };
35. 35.🧰 Why write a function? (a) to make code longer (b) to slow the app (c) to hide errors (d) to reuse code
36. 36.📊 Survey: which problem bugs you most? How many more votes did “no quiet study place” get than “forgetting birthdays”?
    no quiet study place: 20 votes
    forgetting birthdays: 10 votes
    forgetting homework: 3 votes
37. 37.🔀 What does this PIN rule show?
    let pin = "102";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
38. 38.🐞 After fixing a bug you should ___. (a) delete the test (b) test it again (c) release at once (d) never test
39. 39.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 400 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 400) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(400) → expected 0
    Test 2: delivery(200) → expected 40
    Test 3: delivery(700) → expected 0
40. 40.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 68 px tall
    Next button: 52 px tall
    Done button: 44 px tall (a) Start (b) Next (c) Done

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