App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 258 · 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.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) log a glass of water (b) custom alert sounds (c) set a reminder time (d) see today’s total
2. 2.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let stars = 50; // start at 49
   line 2: stars = stars * 2; // double it
   line 3: stars = stars + 5; // add 5
   line 4: stars = stars - 4; // take away 4
   line 5: show(stars); // show it (a) line 4 (b) line 2 (c) line 3 (d) line 1
3. 3.🗒️ Version 1 of a homework planner must be ready in 8 days. How many days are left for extras after the must-haves?
   add a homework task: 1 days
   set a due date: 4 days
   see tasks by day: 2 days
4. 4.🔀 What does this PIN rule show?
   let pin = "958";
   if (pin.length === 4) {
     show("PIN saved");
   } else {
     show("Use 4 digits");
   } (a) PIN saved (b) Use 4 digits
5. 5.💾 Which works with no internet at all? (a) a shared chat (b) a cloud backup (c) data saved on the phone (d) a cloud leaderboard
6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Back button: 40 px tall
   Save button: 60 px tall
   Start button: 52 px tall
7. 7.🔢 In a photo-post flow, which comes first: “post the photo” or “add a filter”? (a) add a filter (b) post the photo
8. 8.📅 An app team plans for 5 days, builds for 6 days, tests for 3 days and releases on 1 more day. How many days does the whole project take?
9. 9.Which of these requests asks for too much? (a) voice notes → microphone (b) calling app → contacts (c) camera app → camera (d) quiz app → microphone
10. 10.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 80; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 3 (c) line 1 (d) line 2
11. 11.🖼️ In this wireframe (top to bottom), what is right below the search box?
    [ Save button ]
    [ search box ]
    [ big picture ]
    [ menu icon ]
    [ tab bar ] (a) big picture (b) menu icon (c) tab bar (d) Save button
12. 12.🧰 What is a function? (a) a screen size (b) a list of colours (c) a named block of code (d) a type of phone
13. 13.🖼️ In this wireframe (top to bottom), what is right below the menu icon?
    [ Add button ]
    [ big picture ]
    [ menu icon ]
    [ tab bar ]
    [ list of items ]
    [ title text ] (a) list of items (b) Add button (c) tab bar (d) big picture
14. 14.🔁 What is the LAST line this code shows?
    let names = ["Zoya", "Kabir", "Meera", "Riya", "Arjun"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Arjun (b) Hi, Kabir (c) Hi, Zoya (d) Hi, Meera
15. 15.🔍 Which is the odd one out? (a) put it on an app store (b) write the store text (c) pick the features (d) share the download link
16. 16.🧰 How do you run (call) a function called greet? (a) #greet (b) run greet (c) greet() (d) greet[]
17. 17.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Edit photo”
    2. tap the Feed tab
    3. open “Edit photo”
    4. tap Back
    5. open “Friend list”
    How many times must you tap Back to reach the main screen of this tab?
18. 18.🔍 Which is the odd one out? (a) tapping a button (b) working out a tip (c) typing your age (d) taking a photo
19. 19.♿ What should every icon-only button have for screen readers? (a) a sound (b) a bright colour (c) a long animation (d) a text label
20. 20.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
21. 21.🗒️ The first small, working version of an app is often called an ___. (a) FAQ (b) CPU (c) URL (d) MVP
22. 22.✏️ Is this true of a wireframe or of a final design: has the real colours? (a) a wireframe (b) a final design
23. 23.Which of these is processing? (a) speaking a command (b) taking a photo (c) typing your age (d) working out a tip
24. 24.True or false: how many taps it takes is about UX (the experience). (a) True (b) False
25. 25.🧰 What does this code show?
    function greet(name) {
      return "Hi, " + name + "!";
    }
    show(greet("Arjun")); (a) Hi, name! (b) Hi, Arjun! (c) greet (d) Arjun
26. 26.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Map”
    2. open “Video”
    3. tap Back
    Which screen are you on now? (a) Map (b) Feed (c) Video (d) Chat
27. 27.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
28. 28.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 53; // start at 50
    line 2: stars = stars * 2; // double it
    line 3: stars = stars * 2; // double it
    line 4: show(stars); // show it
29. 29.Which colour pair is hard to read? (a) white on dark green (b) dark blue on white (c) white on black (d) yellow on white
30. 30.🔐 Is this permission request fair or too much: quiz app → microphone? (a) too much (b) fair
31. 31.📊 Survey: which problem bugs you most? How many more votes did “forgetting homework” get than “losing water bottles”?
    forgetting homework: 25 votes
    missing the bus: 18 votes
    losing water bottles: 5 votes
32. 32.🧪 One test case fails. Which one?
    🎟️ 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(13) → expected 100
    Test 2: price(19) → expected 100
    Test 3: price(9) → expected 50 (a) Test 3 (b) Test 1 (c) Test 2
33. 33.Which of these is a screen? (a) tap to Save (b) your high score (c) a switch for dark mode (d) the home page of an app
34. 34.🖼️ In this wireframe (top to bottom), what is right above the Save button?
    [ tab bar ]
    [ Save button ]
    [ search box ]
    [ filter buttons ]
    [ top bar ]
    [ big picture ] (a) tab bar (b) search box (c) filter buttons (d) big picture
35. 35.⚙️ In an app, is a beep sound an input, processing or an output? (a) output (b) processing (c) input
36. 36.🖼️ In this wireframe (top to bottom), what is right below the Add button?
    [ Add button ]
    [ filter buttons ]
    [ title text ]
    [ Save button ]
    [ tab bar ] (a) title text (b) filter buttons (c) Save button (d) tab bar
37. 37.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. tap the Home tab
    2. open “Map”
    3. tap Back
    How many times must you tap Back to reach the main screen of this tab?
38. 38.🔀 In a good flow, each screen should lead to ___. (a) a clear next step (b) the same screen (c) a random page (d) a dead end
39. 39.Which of these is an input? (a) adding up a bill (b) taking a photo (c) working out a tip (d) a buzz (vibration)
40. 40.Which of these is true of the back button? (a) goes to the last screen (b) switches main sections (c) opens a list of pages (d) sits at the bottom

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