App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 754 · 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.✏️ Is this true of a wireframe or of a final design: looks like the real app? (a) a wireframe (b) a final design
2. 2.🧰 What number does this code show?
   function points(stars) {
     return stars * 10 + 5;
   }
   show(points(1) + points(2));
3. 3.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
   Design A: Home → Size → Pens → Results
   Design B: Home → Size → Address → Item → Cart → Search (a) Design B (b) Design A
4. 4.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) input (c) output
5. 5.🛠️ At which stage do you talk to possible users? (a) the build stage (b) the test stage (c) the idea stage (d) the plan stage
6. 6.⚙️ What number does this app show?
   let price = 95; // typed by the user
   let qty = 2; // typed by the user
   let total = price * qty;
   show(total);
7. 7.🧪 One test case fails. Which one?
   🚚 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(650) → expected 0
   Test 3: delivery(200) → expected 40 (a) Test 2 (b) Test 3 (c) Test 1
8. 8.🌗 Is dark blue on black easy or hard to read on a button? (a) hard to read (b) easy to read
9. 9.🔐 Which permission does a bus tracker really need? (a) contacts (b) the camera (c) location (d) the microphone
10. 10.🚀 In version 2.5.1, which number is the major version? (a) 1 (b) 2 (c) 251 (d) 5
11. 11.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting birthdays: 9 votes
    no quiet study place: 23 votes
    forgetting homework: 21 votes (a) no quiet study place (b) forgetting birthdays (c) forgetting homework
12. 12.🧰 In function tip(bill), what is bill? (a) a parameter (b) an event (c) a loop (d) a screen
13. 13.🧪 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(300) → expected 0
    Test 2: delivery(500) → expected 0
    Test 3: delivery(250) → expected 40
14. 14.👆 What kind of event is this: a finger hits Like? (a) a tap event (b) a load event (c) a text event (d) a timer event
15. 15.🔘 Is this good or poor button design: a clear word like Save? (a) good design (b) poor design
16. 16.🧭 Why should every screen show where you are? (a) to look busy (b) so users do not get lost (c) to hide the menu (d) to use more battery
17. 17.👆 Two designs for the same task (each arrow is one tap). How many taps does Design B need?
    Design A: Home → Pens → Results
    Design B: Home → Pay → Item → Size
18. 18.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Match report”
    2. tap the Quiz tab
    3. open “Badges”
    4. tap the Me tab
    5. open “Edit photo”
    How many times must you tap Back to reach the main screen of this tab?
19. 19.👆 The user taps the button 4 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
20. 20.💾 Data saved only on the phone is lost when ___. (a) you send a message (b) the app is closed (c) the phone is lost (d) the screen turns off
21. 21.🔀 What does this sign-up rule show?
    let age = 16;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    } (a) Ask a parent (b) Welcome!
22. 22.True or false: a website has a home-screen icon. (a) True (b) False
23. 23.🗂️ What kind of app is a step counter? (a) a game (b) a learning app (c) a health app (d) a tool app
24. 24.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 43; // start at 43
    line 2: score = score + 5; // take away 5
    line 3: score = score * 2; // double it
    line 4: score = score + 3; // add 3
    line 5: show(score); // show it
25. 25.💡 Which app idea solves this problem: nobody knows whose bag it is? (a) a bill splitter (b) a homework planner (c) a medicine reminder (d) a lost-and-found board
26. 26.🔢 In a quiz-app flow, which comes first: “pick an answer” or “see the final score”? (a) see the final score (b) pick an answer
27. 27.🔀 Why plan the user flow before building? (a) to skip testing (b) to hide the buttons (c) so each step is clear (d) to add more taps
28. 28.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting birthdays: 5 votes
    losing water bottles: 16 votes
    missing the bus: 9 votes (a) forgetting birthdays (b) missing the bus (c) losing water bottles
29. 29.Which of these is true of a website? (a) comes from an app store (b) updates from the store (c) opens from a link (d) is installed on a phone
30. 30.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) water animations (b) see today’s total (c) log a glass of water (d) set a reminder time
31. 31.🔍 Which is the odd one out? (a) a racing challenge (b) a step counter (c) a cricket run chase (d) a puzzle with levels
32. 32.🔀 A screen with no way forward or back is called a ___. (a) shortcut (b) home screen (c) tab bar (d) dead end
33. 33.👆 The user types Kabir 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) Kabir (c) Well done, nameBox.text! (d) Well done, Kabir!
34. 34.True or false: grey text on grey is good button design. (a) False (b) True
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 72 px tall
    Send button: 36 px tall
    Start button: 52 px tall (a) Send (b) Help (c) Start
36. 36.🔍 Which is the odd one out? (a) big touch targets (b) captions on videos (c) text that can grow (d) colour as the only clue
37. 37.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(5) + points(0));
38. 38.🧪 What is the ACTUAL result of Test 3?
    🚚 Rule: delivery is free (0) when the order is 800 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 800) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(650) → expected 40
    Test 2: delivery(950) → expected 0
    Test 3: delivery(1000) → expected 0
39. 39.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Help page”
    2. open “Help page”
    3. tap the Feed tab
    4. open “Friend list”
    5. open “Badges”
    How many times must you tap Back to reach the main screen of this tab?
40. 40.🔢 In a sign-up flow, what comes right after “type name and email”? (a) see the home screen (b) open the app (c) tap “Sign up” (d) make a password

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