App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 868 · 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.👆 The user taps the button 7 times. What number does the label show now?
   let likes = 0;
   button.onTap = function () {
     if (likes < 2) {
       likes = likes + 1;
     }
     label.text = likes;
   };
2. 2.🔢 After an app is released, which comes first: “list what to fix” or “read user reviews”? (a) read user reviews (b) list what to fix
3. 3.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let score = 30; // start at 30
   line 2: score = score + 3; // add 3
   line 3: score = score * 2; // double it
   line 4: score = score - 4; // take away 1
   line 5: show(score); // show it (a) line 4 (b) line 3 (c) line 1 (d) line 2
4. 4.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
   [title] Settings
   [text box] Due date
   [slider] Brightness
   [button] Done
   [text box] Name
   [text box] City
   [switch] Dark mode
   [button] Next
5. 5.🧩 Which of these is a button on this screen?
   [title] Order Snacks
   [button] Start
   [button] Help
   [button] Send
   [text box] Due date (a) Help (b) Due date
6. 6.🧰 In function tip(bill), what is bill? (a) a parameter (b) a screen (c) an event (d) a loop
7. 7.📊 Survey: which problem bugs you most? Which problem should your app solve first?
   no quiet study place: 8 votes
   forgetting homework: 21 votes
   losing water bottles: 11 votes (a) forgetting homework (b) no quiet study place (c) losing water bottles
8. 8.🗂️ What kind of app is a word battle? (a) a learning app (b) a game (c) a tool app (d) a health app
9. 9.🚀 Which version is newer: 3.10.1 or 3.6.2? (a) 3.10.1 (b) 3.6.2
10. 10.🗒️ In MVP, the M stands for ___. (a) mobile (b) maximum (c) music (d) minimum
11. 11.🔁 Why use a loop to show 100 messages? (a) less code to write (b) it uses more lines (c) it is slower (d) it hides them
12. 12.🎯 Why learn about users before you build? (a) to pick a logo (b) to slow it down (c) to build what they need (d) to make it longer
13. 13.🔁 What number does this code show?
    let scores = [9, 1, 19, 2];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
14. 14.🗂️ What kind of app is a racing challenge? (a) a game (b) a learning app (c) a health app (d) a tool app
15. 15.Which of these happens at the idea stage? (a) write the code (b) write down the bugs (c) spot a problem to solve (d) let friends try it
16. 16.🔐 Which permission does a weather-near-me app really need? (a) location (b) contacts (c) the microphone (d) the camera
17. 17.💾 Which can hold many values in order? (a) a list (b) a single number (c) a switch (d) a button
18. 18.Which of these requests asks for too much? (a) calculator → location (b) camera app → camera (c) map app → location (d) calling app → contacts
19. 19.Which of these requests asks for too much? (a) calling app → contacts (b) map app → location (c) timer → your photos (d) camera app → camera
20. 20.👆 What kind of event is this: a finger hits Like? (a) a timer event (b) a tap event (c) a text event (d) a load event
21. 21.🧪 What is the ACTUAL result of Test 1?
    🎟️ Rule: a ticket costs 50 for children under 13, and 100 for everyone else.
    function price(age) {
      if (age <= 13) {
        return 50;
      }
      return 100;
    }
    Test 1: price(18) → expected 100
    Test 2: price(13) → expected 100
    Test 3: price(9) → expected 50
22. 22.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 10, and 100 for everyone else.
    function price(age) {
      if (age < 10) {
        return 50;
      }
      return 100;
    }
    Test 1: price(10) → expected 100
    Test 2: price(12) → expected 100
    Test 3: price(9) → expected 50
23. 23.💡 How can you check that people really have the problem? (a) copy another app (b) just guess (c) ask possible users (d) pick a colour
24. 24.🧪 One test case fails. Which one?
    🚚 Rule: delivery is free (0) when the order is 600 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 600) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(600) → expected 0
    Test 2: delivery(750) → expected 0
    Test 3: delivery(500) → expected 40 (a) Test 3 (b) Test 2 (c) Test 1
25. 25.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Video”
    2. tap Back
    3. open “Edit photo”
    How many times must you tap Back to reach the main screen of this tab?
26. 26.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) rate the driver (b) pick your bus stop (c) see where the bus is (d) show arrival time
27. 27.Which of these is true of a wireframe? (a) uses the final pictures (b) shows the real fonts (c) has the real colours (d) uses plain grey boxes
28. 28.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(4) + points(4));
29. 29.🗒️ Why keep version 1 small? (a) to look bigger (b) to use up storage (c) to confuse users (d) to learn from users soon
30. 30.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
31. 31.🔍 Which is the odd one out? (a) a torch (b) a calculator (c) a flashcard trainer (d) a unit converter
32. 32.👥 A school app has 20 students, 215 teachers and 35 parents as users. How many users does it have in all?
33. 33.Which of these fits saving on the phone? (a) chat messages to friends (b) a class leaderboard (c) a shared to-do list (d) the sound on/off setting
34. 34.🔍 Which is the odd one out? (a) how users feel after (b) the button colours (c) the font size (d) the screen layout
35. 35.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Menu: 11 px
    Body text: 11 px
    Label: 22 px
    Footer: 21 px
    Caption: 21 px
36. 36.🔘 Our rule: buttons are at least 48 px tall. The Save button is 32 px tall. How many px taller must it be?
37. 37.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Help page”
    2. open “Help page”
    3. tap Back
    4. open “Edit photo”
    5. tap the Feed tab
    How many times must you tap Back to reach the main screen of this tab?
38. 38.🔁 What is the LAST line this code shows?
    let names = ["Riya", "Arjun", "Meera", "Aman"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Riya (b) Hi, Aman (c) Hi, Arjun (d) Hi, Meera
39. 39.📱 Which one is installed on a phone: an app or a website? (a) a website (b) an app
40. 40.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 33; // start at 32
    line 2: stars = stars - 1; // take away 1
    line 3: stars = stars + 2; // add 2
    line 4: show(stars); // show it

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