App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 896 · 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.🔍 Which is the odd one out? (a) typing your age (b) a pop-up message (c) a buzz (vibration) (d) a beep sound
2. 2.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
   Design A: Home → Pens → Address → Size → Pay → Search
   Design B: Home → Pens → Address → Offers → Size
3. 3.🔀 What does >= mean? (a) smaller or equal (b) not equal (c) greater than or equal (d) less than
4. 4.👆 What kind of event is this: one second passes? (a) a timer event (b) a tap event (c) a load event (d) a text event
5. 5.🔀 What does this battery rule show?
   let battery = 14;
   if (battery < 20) {
     show("Low battery");
   } else {
     show("Battery OK");
   } (a) Battery OK (b) Low battery
6. 6.🐞 This code has a bug. What number does it ACTUALLY show?
   line 1: let score = 53; // start at 50
   line 2: score = score + 5; // add 5
   line 3: score = score * 2; // double it
   line 4: show(score); // show it
7. 7.📊 Survey: which problem bugs you most? How many students voted in all?
   missing the bus: 11 votes
   forgetting birthdays: 19 votes
   forgetting homework: 17 votes
8. 8.♿ Why add captions to videos? (a) to hide the sound (b) so anyone can follow (c) to add colour (d) to slow them down
9. 9.🔢 In a sign-up flow, which comes LAST? (a) tap “Sign up” (b) see the home screen (c) type name and email (d) open the app
10. 10.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Score card”
    2. tap the Settings tab
    3. tap the Feed tab
    4. open “Video”
    5. open “Friend list”
    How many times must you tap Back to reach the main screen of this tab?
11. 11.🧪 How many of these test cases pass?
    📝 Rule: a quiz is passed with 6 or more right answers.
    function result(right) {
      if (right > 6) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(4) → expected Try again
    Test 2: result(7) → expected Pass
    Test 3: result(6) → expected Pass
12. 12.True or false: a tiny 20 px button is good button design. (a) True (b) False
13. 13.🔀 What does this battery rule show?
    let battery = 26;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    } (a) Low battery (b) Battery OK
14. 14.Which of these is true of a website? (a) has a web address (b) has a home-screen icon (c) is installed on a phone (d) updates from the store
15. 15.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(35, 6));
16. 16.Which of these is true of a tab bar? (a) hides extra links (b) opens a list of pages (c) shows 3 to 5 icons (d) goes to the last screen
17. 17.🔁 What number does this code show?
    let steps = [30, 58, 71, 98, 40];
    let count = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] >= 70) {
        count = count + 1;
      }
    }
    show(count);
18. 18.True or false: the user types a letter is a text event. (a) False (b) True
19. 19.⚙️ In an app, is a pop-up message an input, processing or an output? (a) output (b) input (c) processing
20. 20.👆 What kind of event is this: the search box changes? (a) a text event (b) a tap event (c) a timer event (d) a load event
21. 21.💾 In most code, the first item of a list is at position ___. (a) 10 (b) 2 (c) 0 (d) 1
22. 22.True or false: space between buttons is poor button design. (a) False (b) True
23. 23.🖼️ How many parts (boxes) does this wireframe have?
    [ Save button ]
    [ search box ]
    [ top bar ]
    [ Add button ]
24. 24.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 56 px tall
    Start button: 48 px tall
    Done button: 36 px tall
    Next button: 32 px tall
25. 25.🔐 Is this permission request fair or too much: torch → contacts? (a) fair (b) too much
26. 26.🔢 When you make an app, which comes first: “release it” or “test the app”? (a) test the app (b) release it
27. 27.🔀 What is a user flow? (a) a type of font (b) a charging cable (c) the path through screens (d) a colour theme
28. 28.🎨 A beautiful app that confuses everyone has ___. (a) no UI at all (b) good UX but poor UI (c) perfect UX (d) good UI but poor UX
29. 29.🔍 Which is the odd one out? (a) text that can grow (b) labels on every icon (c) big touch targets (d) icons with no labels
30. 30.🔀 Which badge does this quiz app show?
    let marks = 93;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    } (a) Bronze (b) Silver (c) Gold
31. 31.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Send button: 44 px tall
    Back button: 36 px tall
32. 32.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. tap the Lessons tab
    2. tap the Lessons tab
    3. tap the Me tab
    4. open “Video”
    Which screen are you on now? (a) Quiz (b) Me (c) Lessons (d) Video
33. 33.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(39));
34. 34.🔢 After an app is released, which comes first: “fix and improve” or “test it again”? (a) test it again (b) fix and improve
35. 35.💾 What number does this code show?
    let stars = 6;
    stars = stars - 4;
    stars = stars + 1;
    show(stars);
36. 36.🧪 One test case fails. Which one?
    🚚 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(1100) → expected 0
    Test 2: delivery(800) → expected 0
    Test 3: delivery(700) → expected 40 (a) Test 1 (b) Test 3 (c) Test 2
37. 37.🔀 What does this PIN rule show?
    let pin = "152";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    } (a) PIN saved (b) Use 4 digits
38. 38.Which of these is a screen? (a) tap to Save (b) your high score (c) the game-over page (d) tap to Send
39. 39.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Caption: 20 px
    Footer: 10 px
    Menu: 20 px (a) Caption (b) Footer (c) Menu
40. 40.🔁 What number does this code show?
    let scores = [6, 20, 19, 2];
    let best = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] > best) {
        best = scores[i];
      }
    }
    show(best);

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