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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 611 · 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.🖼️ How many parts (boxes) does this wireframe have?
    [ list of items ]
    [ title text ]
    [ filter buttons ]
    [ search box ]
    [ Save button ]
  2. 2.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    missing the bus: 16 votes
    losing water bottles: 18 votes
    forgetting homework: 11 votes     (a) losing water bottles (b) missing the bus (c) forgetting homework
  3. 3.Which of these happens at the build stage? (a) talk to possible users (b) spot a problem to solve (c) write down the bugs (d) write the code
  4. 4.🔀 What does this battery rule show?
    let battery = 1;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    }     (a) Low battery (b) Battery OK
  5. 5.🎯 Which app would help this user most: a student who keeps forgetting due dates? (a) a water reminder (b) a recipe finder (c) a homework planner (d) a big-text reader
  6. 6.🧩 In an app, what is your friends list? (a) an input (b) a button (c) data (d) a screen
  7. 7.True or false: an app is installed on a phone. (a) False (b) True
  8. 8.🧪 What is the ACTUAL result of Test 2?
    🎟️ Rule: a ticket costs 50 for children under 11, and 100 for everyone else.
    function price(age) {
      if (age < 11) {
        return 50;
      }
      return 100;
    }
    Test 1: price(8) → expected 50
    Test 2: price(17) → expected 100
    Test 3: price(11) → expected 100
  9. 9.🔀 What does this sign-up rule show?
    let age = 13;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Welcome! (b) Ask a parent
  10. 10.🔁 What number does this code show?
    let marks = [99, 85, 71, 39];
    let count = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] >= 50) {
        count = count + 1;
      }
    }
    show(count);
  11. 11.🧩 What does a button do when you tap it? (a) changes the phone (b) saves the battery (c) starts an action (d) shows the time
  12. 12.🔀 When does the else part run? (a) when the test is false (b) never (c) when the test is true (d) always
  13. 13.🔀 What does this battery rule show?
    let battery = 27;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    }     (a) Battery OK (b) Low battery
  14. 14.💾 Saving data in the cloud lets you ___. (a) use it on any device (b) shrink the app (c) skip the internet (d) never need a password
  15. 15.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 9, and 100 for everyone else.
    function price(age) {
      if (age < 9) {
        return 50;
      }
      return 100;
    }
    Test 1: price(15) → expected 100
    Test 2: price(8) → expected 50
    Test 3: price(14) → expected 100
  16. 16.🔁 What number does this code show?
    let runs = [76, 39, 70, 66];
    let count = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] >= 70) {
        count = count + 1;
      }
    }
    show(count);
  17. 17.👆 An event in an app is ___. (a) a kind of list (b) something that happens (c) an app store (d) a colour theme
  18. 18.🔀 What does this sign-up rule show?
    let age = 12;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Welcome! (b) Ask a parent
  19. 19.True or false: a box to type a name is an input. (a) True (b) False
  20. 20.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Offers → Pay → Shop → Confirm → Search
    Design B: Home → Item → Pay → Offers → Shop     (a) Design A (b) Design B
  21. 21.🔁 What number does this code show?
    let steps = [27, 13, 81];
    let count = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] >= 50) {
        count = count + 1;
      }
    }
    show(count);
  22. 22.Which of these fits saving on the phone? (a) notes to read offline (b) chat messages to friends (c) a shared to-do list (d) photos on two devices
  23. 23.🔢 When you make an app, which comes first: “release it” or “plan the screens”? (a) plan the screens (b) release it
  24. 24.🔘 Is this good or poor button design: a clear word like Save? (a) poor design (b) good design
  25. 25.⚙️ In an app, is checking a password an input, processing or an output? (a) processing (b) input (c) output
  26. 26.Which of these is an output? (a) a buzz (vibration) (b) working out a tip (c) speaking a command (d) typing your age
  27. 27.👆 Two designs for the same task (each arrow is one tap). How many taps does the shorter design save?
    Design A: Home → Menu → Search → Cart → Offers
    Design B: Home → Offers → Item → Cart → Size → Address → Pay
  28. 28.🎯 Is this a user need or a feature: “I forget my homework”? (a) a feature (b) a user need
  29. 29.True or false: buttons almost touching is poor button design. (a) False (b) True
  30. 30.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 72 px tall
    Send button: 56 px tall
    Help button: 60 px tall
    Next button: 24 px tall     (a) Help (b) Send (c) Next (d) Back
  31. 31.💾 What number does this code show?
    let stars = 7;
    stars = stars - 7;
    stars = stars + 5;
    show(stars);
  32. 32.🎯 Which app would help this user most: a runner who forgets to sip water? (a) a pocket-money tracker (b) a bus tracker (c) a water reminder (d) a big-text reader
  33. 33.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let score = 38; // start at 38
    line 2: score = score * 3; // double it
    line 3: score = score - 2; // take away 2
    line 4: show(score); // show it     (a) line 1 (b) line 2 (c) line 3
  34. 34.🔁 What number does this code show?
    let marks = [4, 6, 15, 19];
    let total = 0;
    for (let i = 0; i < marks.length; i++) {
      total = total + marks[i];
    }
    show(total);
  35. 35.🧰 What is a function? (a) a list of colours (b) a named block of code (c) a type of phone (d) a screen size
  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.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 33; // start at 30
    line 2: stars = stars - 3; // take away 3
    line 3: stars = stars * 2; // double it
    line 4: stars = stars + 6; // add 6
    line 5: show(stars); // show it
  38. 38.🧭 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
  39. 39.💾 Where should the app save a shared to-do list: on the phone or in the cloud? (a) on the phone (b) in the cloud
  40. 40.True or false: a unit converter is a tool app. (a) False (b) True

Answer key

  1. 5
  2. losing water bottles
  3. write the code
  4. Low battery
  5. a homework planner
  6. data
  7. True
  8. 100
  9. Welcome!
  10. 3
  11. starts an action
  12. when the test is false
  13. Battery OK
  14. use it on any device
  15. 3
  16. 2
  17. something that happens
  18. Ask a parent
  19. True
  20. Design B
  21. 1
  22. notes to read offline
  23. plan the screens
  24. good design
  25. processing
  26. a buzz (vibration)
  27. 2
  28. a user need
  29. True
  30. Next
  31. 5
  32. a water reminder
  33. line 2
  34. 44
  35. a named block of code
  36. 4
  37. 60
  38. so users do not get lost
  39. in the cloud
  40. True

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