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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 761 · 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 line does the processing (works out the answer)?
    line 1: let price = 310; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay);     (a) line 2 (b) line 3 (c) line 1 (d) line 4
  2. 2.🔍 Which is the odd one out? (a) add the buttons (b) write the code (c) spot a problem to solve (d) connect the data
  3. 3.🚀 Which of these versions is the OLDEST?
    2.28.0, 3.14.2, 3.5.8, 3.12.1     (a) 3.14.2 (b) 3.5.8 (c) 3.12.1 (d) 2.28.0
  4. 4.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) in the cloud (b) on the phone
  5. 5.🔀 A screen with no way forward or back is called a ___. (a) shortcut (b) tab bar (c) home screen (d) dead end
  6. 6.🔢 After an app is released, which comes FIRST? (a) read user reviews (b) release an update (c) list what to fix (d) fix and improve
  7. 7.True or false: a lost-and-found board solves no real problem. (a) False (b) True
  8. 8.🔀 What does this battery rule show?
    let battery = 21;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    }     (a) Low battery (b) Battery OK
  9. 9.🧭 What does the back button usually do? (a) opens settings (b) closes all apps (c) goes to the last screen (d) deletes the page
  10. 10.True or false: a library due-date alert solves no real problem. (a) True (b) False
  11. 11.True or false: a page of random dots solves no real problem. (a) False (b) True
  12. 12.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 3 (b) 1, 2, 3 (c) 0, 1, 2 (d) 0, 1, 2, 3
  13. 13.🗒️ What is a must-have feature? (a) a nice extra (b) one the app cannot skip (c) a sound effect (d) a colour theme
  14. 14.Which colour pair is hard to read? (a) black on pale grey (b) dark blue on white (c) dark blue on black (d) white on dark green
  15. 15.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 52 px tall
    Cancel button: 72 px tall
    Back button: 72 px tall
    Start button: 24 px tall     (a) Save (b) Cancel (c) Start (d) Back
  16. 16.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(1) + points(0));
  17. 17.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 50;
    }
    show(fee(2) + fee(12));
  18. 18.Which of these app ideas solves a real problem? (a) a medicine reminder (b) a button with no action (c) an app that just says hi (d) a page of random dots
  19. 19.Which of these is true of a final design? (a) uses plain grey boxes (b) has the real colours (c) has no real colours (d) is a quick sketch
  20. 20.⚙️ What number does this app show?
    let bill = 138; // typed by the user
    let friends = 2; // typed by the user
    let share = bill / friends;
    show(share);
  21. 21.🔀 What does this sign-up rule show?
    let age = 9;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Welcome! (b) Ask a parent
  22. 22.📊 Survey: which problem bugs you most? How many students voted in all?
    missing the bus: 15 votes
    losing water bottles: 24 votes
    forgetting homework: 8 votes
  23. 23.🧪 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(5) → expected Try again
    Test 2: result(8) → expected Pass
    Test 3: result(10) → expected Pass
  24. 24.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 48; // start at 45
    line 2: stars = stars * 2; // double it
    line 3: stars = stars * 2; // double it
    line 4: stars = stars - 1; // take away 1
    line 5: show(stars); // show it     (a) line 2 (b) line 1 (c) line 3 (d) line 4
  25. 25.Which of these is true of a website? (a) has a home-screen icon (b) is installed on a phone (c) needs no installing (d) comes from an app store
  26. 26.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Results → Cart
    Design B: Home → Menu → Search → Results     (a) Design B (b) Design A
  27. 27.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Title: 18 px
    Label: 12 px
    Caption: 12 px
    Body text: 13 px
    Footer: 12 px
  28. 28.Which of these app ideas solves a real problem? (a) an app that just says hi (b) a blank grey screen (c) a page of random dots (d) a lost-and-found board
  29. 29.🗒️ You are planning version 1 of a water reminder. Which feature is a MUST-HAVE? (a) log a glass of water (b) share your streak (c) water animations (d) custom alert sounds
  30. 30.Which of these makes the app harder to use? (a) icons with no labels (b) labels on every icon (c) text that can grow (d) big touch targets
  31. 31.🧭 Which part of navigation sits at the bottom? (a) the back button (b) a menu button (c) a tab bar
  32. 32.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    losing water bottles: 13 votes
    wasting pocket money: 19 votes
    missing the bus: 4 votes     (a) losing water bottles (b) missing the bus (c) wasting pocket money
  33. 33.🧩 Which input is best for typing your name? (a) a picture (b) a slider (c) a switch (d) a text box
  34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 52 px tall
    Done button: 48 px tall
    Send button: 36 px tall
    Start button: 60 px tall     (a) Start (b) Send (c) Done (d) Cancel
  35. 35.True or false: the user taps Play is a timer event. (a) True (b) False
  36. 36.♿ A screen has 6 icon buttons. Only 2 of them have a text label for screen readers. How many still need a label?
  37. 37.🚀 Your app is at version 3.12.3. The next release adds a new feature. What is its version number? (a) 4.0.0 (b) 3.13.0 (c) 3.13.3 (d) 3.12.4
  38. 38.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Video”
    2. tap the Search tab
    3. open “Help page”
    How many times must you tap Back to reach the main screen of this tab?
  39. 39.🔀 What does this PIN rule show?
    let pin = "913";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) Use 4 digits (b) PIN saved
  40. 40.True or false: a website opens in a web browser. (a) False (b) True

Answer key

  1. line 3
  2. spot a problem to solve
  3. 2.28.0
  4. in the cloud
  5. dead end
  6. read user reviews
  7. False
  8. Battery OK
  9. goes to the last screen
  10. False
  11. True
  12. 0, 1, 2
  13. one the app cannot skip
  14. dark blue on black
  15. Start
  16. 20
  17. 50
  18. a medicine reminder
  19. has the real colours
  20. 69
  21. Ask a parent
  22. 47
  23. 3
  24. line 1
  25. needs no installing
  26. Design A
  27. 4
  28. a lost-and-found board
  29. log a glass of water
  30. icons with no labels
  31. a tab bar
  32. wasting pocket money
  33. a text box
  34. Send
  35. False
  36. 4
  37. 3.13.0
  38. 1
  39. Use 4 digits
  40. True

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