App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 485 · 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.True or false: a wireframe uses plain grey boxes. (a) True (b) False
2. 2.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
   1. open “Match report”
   2. open “Edit photo”
   3. open “Friend list”
   How many times must you tap Back to reach the main screen of this tab?
3. 3.🧭 Why should every screen show where you are? (a) to look busy (b) so users do not get lost (c) to use more battery (d) to hide the menu
4. 4.True or false: buttons almost touching is good button design. (a) True (b) False
5. 5.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 60 px tall
   Start button: 68 px tall
   Next button: 24 px tall (a) Cancel (b) Next (c) Start
6. 6.👆 What kind of event is this: the user presses Save? (a) a text event (b) a load event (c) a timer event (d) a tap event
7. 7.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let stars = 35; // start at 35
   line 2: stars = stars - 6; // add 6
   line 3: stars = stars + 4; // add 4
   line 4: show(stars); // show it
8. 8.📅 An app team plans for 2 days, builds for 4 days, tests for 1 days and releases on 1 more day. Planning starts on day 1. On which day does building finish?
9. 9.✏️ Is this true of a wireframe or of a final design: shows the real fonts? (a) a wireframe (b) a final design
10. 10.👆 The user taps the button 3 times. What number does the label show now?
    let coins = 2;
    button.onTap = function () {
      coins = coins + 2;
      label.text = coins;
    };
11. 11.📱 Which one updates from the store: an app or a website? (a) an app (b) a website
12. 12.🔢 In a food-order flow, which comes FIRST? (a) check the cart (b) pick a dish (c) track the order (d) open the menu
13. 13.True or false: an alarm clock is a health app. (a) False (b) True
14. 14.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) pick a theme colour (b) earn stickers (c) add a homework task (d) share tasks to friends
15. 15.🔍 Which is the odd one out? (a) a step counter (b) a flashcard trainer (c) a sleep tracker (d) a water reminder
16. 16.🗒️ Version 1 of a bus tracker must be ready in 7 days. How many days are left for extras after the must-haves?
    see where the bus is: 3 days
    show arrival time: 1 days
    pick your bus stop: 3 days
17. 17.🗒️ What is a must-have feature? (a) a colour theme (b) one the app cannot skip (c) a sound effect (d) a nice extra
18. 18.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let lives = 34; // start at 34
    line 2: lives = lives + 2; // add 2
    line 3: lives = lives - 2; // add 2
    line 4: lives = lives + 3; // add 3
    line 5: show(lives); // show it
19. 19.💾 What is a variable? (a) a named box for a value (b) a picture (c) a phone setting (d) a type of screen
20. 20.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    losing water bottles: 24 votes
    no quiet study place: 19 votes
    forgetting homework: 5 votes (a) losing water bottles (b) no quiet study place (c) forgetting homework
21. 21.🌗 Is white on black easy or hard to read on a button? (a) hard to read (b) easy to read
22. 22.🧭 Which part of navigation goes to the last screen? (a) a tab bar (b) a menu button (c) the back button
23. 23.👥 A clinic app has 225 patients, 220 doctors and 95 nurses as users. How many users does it have in all?
24. 24.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(5) + points(3));
25. 25.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(55, 5));
26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Start button: 60 px tall
    Done button: 56 px tall
    Help button: 24 px tall (a) Done (b) Help (c) Start
27. 27.👆 The user taps the button 5 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) ON (b) OFF
28. 28.🖼️ In this wireframe (top to bottom), what is right above the filter buttons?
    [ search box ]
    [ big picture ]
    [ tab bar ]
    [ Save button ]
    [ filter buttons ] (a) Save button (b) search box (c) tab bar (d) big picture
29. 29.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 48 px tall
    Done button: 64 px tall
    Start button: 52 px tall
30. 30.🔢 After an app is released, which comes first: “test it again” or “release an update”? (a) test it again (b) release an update
31. 31.True or false: a party-invite app for friends needs the microphone. (a) True (b) False
32. 32.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 280; // 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 2 (b) line 1 (c) line 4 (d) line 3
33. 33.🗒️ When should nice-to-have features be built? (a) never (b) after the must-haves (c) on day one (d) before anything
34. 34.🔍 Which is the odd one out? (a) colour as the only clue (b) fast-flashing lights (c) labels on every icon (d) icons with no labels
35. 35.🔀 What does this PIN rule show?
    let pin = "563";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
36. 36.Which of these helps everyone use the app? (a) fast-flashing lights (b) sudden loud sounds (c) strong colour contrast (d) tiny tap areas
37. 37.♿ Does this help everyone, or make the app harder to use: sudden loud sounds? (a) makes it harder (b) helps everyone
38. 38.📅 An app team plans for 3 days, builds for 7 days, tests for 2 days and releases on 1 more day. How many more days does building take than testing?
39. 39.🧰 Why write a function? (a) to reuse code (b) to make code longer (c) to slow the app (d) to hide errors
40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 32 px tall
    Send button: 36 px tall
    Help button: 64 px tall
    Cancel button: 36 px tall

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