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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 500 · 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.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 34; // start at 34
    line 2: stars = stars + 5; // add 3
    line 3: stars = stars - 3; // take away 3
    line 4: show(stars); // show it
  2. 2.🛠️ At which stage do you try every button? (a) the release stage (b) the plan stage (c) the idea stage (d) the test stage
  3. 3.💾 What number does this code show?
    let points = 9;
    points = points - 2;
    points = points + 1;
    show(points);
  4. 4.👆 The user taps the button 5 times. What number does the label show now?
    let points = 4;
    button.onTap = function () {
      points = points + 2;
      label.text = points;
    };
  5. 5.🧩 How many inputs (text boxes, switches and sliders) does this screen have?
    [title] Order Snacks
    [text box] Notes
    [button] Cancel
    [text box] Name
    [button] Start
  6. 6.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 60 px tall
    Send button: 40 px tall
    Cancel button: 32 px tall
  7. 7.📱 Which one has a web address: an app or a website? (a) a website (b) an app
  8. 8.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 8 or more right answers.
    function result(right) {
      if (right > 8) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(5) → expected Try again
    Test 2: result(10) → expected Pass
    Test 3: result(8) → expected Pass     (a) Test 3 (b) Test 2 (c) Test 1
  9. 9.Which of these makes the app harder to use? (a) strong colour contrast (b) text that can grow (c) labels on every icon (d) sudden loud sounds
  10. 10.🔁 What is the LAST line this code shows?
    let names = ["Meera", "Zoya", "Riya", "Kabir"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    }     (a) Hi, Zoya (b) Hi, Meera (c) Hi, Kabir (d) Hi, Riya
  11. 11.🗒️ A to-do app with no “add a task” feature is ___. (a) ready to release (b) a nice extra (c) missing a must-have (d) well planned
  12. 12.💡 An app that tries to do everything at once is usually ___. (a) hard to use (b) finished fast (c) very small (d) easy to build
  13. 13.🔢 In a photo-post flow, what comes right after “add a filter”? (a) post the photo (b) open the camera screen (c) take the photo (d) write a caption
  14. 14.🔀 What does >= mean? (a) greater than or equal (b) not equal (c) smaller or equal (d) less than
  15. 15.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let coins = 50; // start at 50
    line 2: coins = coins - 3; // take away 2
    line 3: coins = coins - 2; // take away 2
    line 4: coins = coins + 3; // add 3
    line 5: show(coins); // show it
  16. 16.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 500 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 500) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(600) → expected 0
    Test 2: delivery(300) → expected 40
    Test 3: delivery(500) → expected 0
  17. 17.True or false: a spelling coach is a learning app. (a) False (b) True
  18. 18.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Video”
    2. tap Back
    3. open “Badges”
    4. open “Edit photo”
    How many times must you tap Back to reach the main screen of this tab?
  19. 19.True or false: the app starts up is a timer event. (a) True (b) False
  20. 20.🧭 Why should every screen show where you are? (a) to look busy (b) so users do not get lost (c) to hide the menu (d) to use more battery
  21. 21.🎨 Is this about UI or UX: whether users get lost? (a) UX (b) UI
  22. 22.⚙️ What number does this app show?
    let km = 7; // typed by the user
    let metres = km * 1000;
    show(metres);
  23. 23.🎯 An app for “everyone” with no clear user usually ___. (a) needs no testing (b) wins every prize (c) is easy to build (d) helps nobody well
  24. 24.🗒️ In MVP, the M stands for ___. (a) minimum (b) music (c) mobile (d) maximum
  25. 25.🎯 Is this a user need or a feature: “I forget my homework”? (a) a feature (b) a user need
  26. 26.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(20, 5));
  27. 27.🖼️ How many parts (boxes) does this wireframe have?
    [ list of items ]
    [ tab bar ]
    [ filter buttons ]
    [ big picture ]
  28. 28.🧩 How many buttons does this app screen have?
    [title] Edit Profile
    [button] Send
    [text box] Age
    [switch] Dark mode
    [text box] Email
  29. 29.⚙️ What number does this app show?
    let price = 25; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
  30. 30.🗒️ The first small, working version of an app is often called an ___. (a) FAQ (b) MVP (c) CPU (d) URL
  31. 31.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 1, 2, 3 (b) 3 (c) 0, 1, 2 (d) 0, 1, 2, 3
  32. 32.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ title text ]
    [ big picture ]
    [ top bar ]
    [ menu icon ]
    [ filter buttons ]     (a) top bar (b) menu icon (c) big picture (d) filter buttons
  33. 33.True or false: a wireframe uses the final pictures. (a) False (b) True
  34. 34.True or false: one second passes is a timer event. (a) False (b) True
  35. 35.True or false: notes to read offline fits saving on the phone. (a) False (b) True
  36. 36.🧩 What does a button do when you tap it? (a) saves the battery (b) changes the phone (c) starts an action (d) shows the time
  37. 37.🧩 Which input is best for typing your name? (a) a switch (b) a picture (c) a text box (d) a slider
  38. 38.👥 A cricket club app has 30 players, 170 coaches and 65 fans as users. Which user group is the biggest? (a) players (b) coaches (c) fans
  39. 39.🧰 What does return do in a function? (a) sends back a value (b) repeats the code (c) deletes the app (d) closes the screen
  40. 40.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 40;
    }
    show(fee(2) + fee(4));

Answer key

  1. 36
  2. the test stage
  3. 8
  4. 14
  5. 2
  6. 1
  7. a website
  8. Test 3
  9. sudden loud sounds
  10. Hi, Kabir
  11. missing a must-have
  12. hard to use
  13. write a caption
  14. greater than or equal
  15. 48
  16. 2
  17. True
  18. 2
  19. False
  20. so users do not get lost
  21. UX
  22. 7000
  23. helps nobody well
  24. minimum
  25. a user need
  26. 100
  27. 4
  28. 1
  29. 50
  30. MVP
  31. 0, 1, 2
  32. filter buttons
  33. False
  34. True
  35. True
  36. starts an action
  37. a text box
  38. coaches
  39. sends back a value
  40. 0

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