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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 878 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.Which of these is a button? (a) your high score (b) tap to Save (c) the settings page (d) the game-over page
  2. 2.🔍 Which is the odd one out? (a) a puzzle with levels (b) a times-table quiz (c) a spelling coach (d) a flashcard trainer
  3. 3.🎯 Why learn about users before you build? (a) to slow it down (b) to build what they need (c) to make it longer (d) to pick a logo
  4. 4.✏️ Is this true of a wireframe or of a final design: shows the real fonts? (a) a final design (b) a wireframe
  5. 5.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Help page”
    2. open “Help page”
    3. tap Back
    4. tap Back
    5. tap the Feed tab
    How many times must you tap Back to reach the main screen of this tab?
  6. 6.🎯 Which app would help this user most: a teen learning to make snacks? (a) a water reminder (b) a recipe finder (c) a pocket-money tracker (d) a bus tracker
  7. 7.✏️ Is this true of a wireframe or of a final design: has no real colours? (a) a final design (b) a wireframe
  8. 8.🧪 One test case fails. Which one?
    🎟️ 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(13) → expected 100
    Test 2: price(10) → expected 100
    Test 3: price(8) → expected 50     (a) Test 3 (b) Test 1 (c) Test 2
  9. 9.🧪 How many of these test cases pass?
    🚚 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(200) → expected 40
    Test 2: delivery(600) → expected 0
    Test 3: delivery(400) → expected 0
  10. 10.🐞 A comment in code (after //) is for ___. (a) people reading the code (b) the battery (c) the phone screen (d) the app store
  11. 11.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(9));
  12. 12.Which of these happens at the plan stage? (a) try every button (b) draw the user flow (c) share the download link (d) add the buttons
  13. 13.⚙️ In an app, is a pop-up message an input, processing or an output? (a) processing (b) input (c) output
  14. 14.🧪 What is the ACTUAL result of Test 2?
    🎟️ Rule: a ticket costs 50 for children under 14, and 100 for everyone else.
    function price(age) {
      if (age <= 14) {
        return 50;
      }
      return 100;
    }
    Test 1: price(20) → expected 100
    Test 2: price(17) → expected 100
    Test 3: price(12) → expected 50
  15. 15.👥 A school app has 105 students, 285 teachers and 60 parents as users. Which user group is the biggest? (a) teachers (b) students (c) parents
  16. 16.🗒️ You are planning version 1 of a water reminder. Which feature can WAIT for a later version? (a) log a glass of water (b) see today’s total (c) share your streak (d) set a reminder time
  17. 17.True or false: you let friends try it at the build stage. (a) True (b) False
  18. 18.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Sign Up
    [button] Send
    [text box] Notes
    [button] Next
    [slider] Brightness
    [button] Cancel
    [text box] City
    [text box] Name
  19. 19.🧭 Why should every screen show where you are? (a) to use more battery (b) to look busy (c) to hide the menu (d) so users do not get lost
  20. 20.🚀 A change from version 1.4.2 to 1.4.3 usually means ___. (a) a new app (b) a new feature (c) a bug fix (d) a big redesign
  21. 21.⚙️ What number does this app show?
    let km = 2; // typed by the user
    let metres = km * 1000;
    show(metres);
  22. 22.🧰 Why write a function? (a) to slow the app (b) to make code longer (c) to reuse code (d) to hide errors
  23. 23.🗒️ Why keep version 1 small? (a) to use up storage (b) to learn from users soon (c) to confuse users (d) to look bigger
  24. 24.True or false: a big-text reader is the best fit for a reader who finds small print hard. (a) False (b) True
  25. 25.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(30));
  26. 26.👆 Two designs for the same task (each arrow is one tap). How many taps does Design B need?
    Design A: Home → Address → Results → Offers → Cart → Item
    Design B: Home → Pay → Cart → Search
  27. 27.🧩 Which of these is a button on this screen?
    [title] Order Snacks
    [button] Start
    [text box] Phone
    [button] Back     (a) Back (b) Phone
  28. 28.✏️ Is this true of a wireframe or of a final design: is a quick sketch? (a) a final design (b) a wireframe
  29. 29.✏️ Do wireframes usually show the final colours? (a) No (b) Yes
  30. 30.🧪 What is the ACTUAL result of Test 3?
    🚚 Rule: delivery is free (0) when the order is 700 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 700) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(500) → expected 40
    Test 2: delivery(800) → expected 0
    Test 3: delivery(700) → expected 0
  31. 31.True or false: a website opens from a link. (a) False (b) True
  32. 32.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    missing the bus: 19 votes
    wasting pocket money: 14 votes
    forgetting homework: 11 votes     (a) missing the bus (b) wasting pocket money (c) forgetting homework
  33. 33.🔢 In a quiz-app flow, which comes FIRST? (a) tap “Start quiz” (b) see the final score (c) pick an answer (d) see if it is right
  34. 34.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Ocean", "Rain"];
    songs.pop();
    show(songs[songs.length - 1]);     (a) Ocean (b) Sunrise (c) Rain
  35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 60 px tall
    Save button: 48 px tall
    Done button: 44 px tall
    Start button: 68 px tall     (a) Back (b) Done (c) Save (d) Start
  36. 36.✏️ Is this true of a wireframe or of a final design: has the real colours? (a) a wireframe (b) a final design
  37. 37.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Footer: 22 px
    Menu: 22 px
    Hint: 14 px     (a) Hint (b) Menu (c) Footer
  38. 38.🧩 In an app, what is tap to Send? (a) data (b) a button (c) a screen (d) an input
  39. 39.♿ Does this help everyone, or make the app harder to use: text that can grow? (a) helps everyone (b) makes it harder
  40. 40.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 44 px tall
    Start button: 60 px tall
    Back button: 72 px tall
    Help button: 68 px tall     (a) Help (b) Start (c) Save (d) Back

Answer key

  1. tap to Save
  2. a puzzle with levels
  3. to build what they need
  4. a final design
  5. 0
  6. a recipe finder
  7. a wireframe
  8. Test 2
  9. 3
  10. people reading the code
  11. 18
  12. draw the user flow
  13. output
  14. 100
  15. teachers
  16. share your streak
  17. False
  18. 4
  19. so users do not get lost
  20. a bug fix
  21. 2000
  22. to reuse code
  23. to learn from users soon
  24. True
  25. 90
  26. 3
  27. Back
  28. a wireframe
  29. No
  30. 40
  31. True
  32. missing the bus
  33. tap “Start quiz”
  34. Ocean
  35. Done
  36. a final design
  37. Hint
  38. a button
  39. helps everyone
  40. Save

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