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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 946 · 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.🔁 Why use a loop to show 100 messages? (a) less code to write (b) it hides them (c) it is slower (d) it uses more lines
  2. 2.💡 Does an app idea like a bill splitter solve a real problem? (a) Yes (b) No
  3. 3.🔢 After an app is released, what comes right after “test it again”? (a) fix and improve (b) release an update (c) list what to fix (d) read user reviews
  4. 4.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 31; // start at 31
    line 2: stars = stars * 2; // double it
    line 3: stars = stars - 6; // take away 5
    line 4: show(stars); // show it     (a) line 3 (b) line 1 (c) line 2
  5. 5.🔢 After an app is released, what comes right after “fix and improve”? (a) read user reviews (b) release an update (c) list what to fix (d) test it again
  6. 6.🚀 In version 2.5.1, which number is the major version? (a) 251 (b) 5 (c) 1 (d) 2
  7. 7.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(3) + points(5));
  8. 8.🧪 How many of these test cases pass?
    📝 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(7) → expected Try again
    Test 2: result(8) → expected Pass
    Test 3: result(9) → expected Pass
  9. 9.🧪 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(10) → expected Pass
    Test 2: result(8) → expected Pass
    Test 3: result(6) → expected Try again     (a) Test 3 (b) Test 1 (c) Test 2
  10. 10.🔀 What does this sign-up rule show?
    let age = 15;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Ask a parent (b) Welcome!
  11. 11.🐞 A comment in code (after //) is for ___. (a) the battery (b) the app store (c) the phone screen (d) people reading the code
  12. 12.🗂️ What kind of app is a times-table quiz? (a) a game (b) a tool app (c) a learning app (d) a health app
  13. 13.📊 Survey: which problem bugs you most? How many students voted in all?
    no quiet study place: 8 votes
    forgetting birthdays: 19 votes
    losing water bottles: 3 votes
  14. 14.🧪 What is the ACTUAL result of Test 3?
    🚚 Rule: delivery is free (0) when the order is 300 or more; otherwise it costs 40.
    function delivery(total) {
      if (total >= 300) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(400) → expected 0
    Test 2: delivery(100) → expected 40
    Test 3: delivery(300) → expected 0
  15. 15.Which of these is an output? (a) a pop-up message (b) tapping a button (c) working out a tip (d) sorting the scores
  16. 16.🗒️ You are planning version 1 of a homework planner. Which feature is a MUST-HAVE? (a) share tasks to friends (b) pick a theme colour (c) earn stickers (d) add a homework task
  17. 17.Which of these is data? (a) tap to go Next (b) the home page of an app (c) your high score (d) a box to type a name
  18. 18.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Menu → Address → Size → Confirm → Item → Pens
    Design B: Home → Pay → Results → Confirm     (a) Design B (b) Design A
  19. 19.🔍 Which is the odd one out? (a) big touch targets (b) labels on every icon (c) text that can grow (d) tiny tap areas
  20. 20.🛠️ At which stage do you list what users need? (a) the build stage (b) the plan stage (c) the idea stage (d) the release stage
  21. 21.🗒️ You are planning version 1 of a homework planner. Which feature can WAIT for a later version? (a) add a homework task (b) pick a theme colour (c) see tasks by day (d) set a due date
  22. 22.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let lives = 34; // start at 34
    line 2: lives = lives + 4; // add 4
    line 3: lives = lives - 5; // add 5
    line 4: show(lives); // show it
  23. 23.🔐 Is this permission request fair or too much: calling app → contacts? (a) fair (b) too much
  24. 24.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) pick your bus stop (b) see where the bus is (c) show arrival time (d) a dark mode
  25. 25.🔍 Which is the odd one out? (a) typing your age (b) sorting the scores (c) speaking a command (d) taking a photo
  26. 26.True or false: a calculator is a tool app. (a) True (b) False
  27. 27.True or false: a bus tracker needs your contacts. (a) True (b) False
  28. 28.🔀 Which badge does this quiz app show?
    let marks = 32;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Silver (b) Gold (c) Bronze
  29. 29.🧪 A test fails when ___. (a) both are the same (b) the font is big (c) actual is not expected (d) the app is new
  30. 30.🔀 What does this PIN rule show?
    let pin = "99889";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) Use 4 digits (b) PIN saved
  31. 31.🖼️ How many parts (boxes) does this wireframe have?
    [ Save button ]
    [ tab bar ]
    [ Add button ]
    [ filter buttons ]
  32. 32.✏️ A box with a cross in a wireframe usually means ___. (a) an error (b) delete this (c) a picture goes here (d) a closed app
  33. 33.💡 Which app idea solves this problem: Grandpa forgets his tablets? (a) a lost-and-found board (b) a medicine reminder (c) a homework planner (d) a bill splitter
  34. 34.True or false: whether users get lost is about UX (the experience). (a) True (b) False
  35. 35.⚙️ What number does this app show?
    let price = 95; // typed by the user
    let qty = 6; // typed by the user
    let total = price * qty;
    show(total);
  36. 36.🧰 A museum app works out the entry fee. What number does this code show?
    function fee(age) {
      if (age < 5) {
        return 0;
      }
      return 20;
    }
    show(fee(6) + fee(11));
  37. 37.True or false: a lost-and-found board solves no real problem. (a) False (b) True
  38. 38.👆 The user taps the button 7 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 3) {
        likes = likes + 1;
      }
      label.text = likes;
    };
  39. 39.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
  40. 40.🗒️ You are planning version 1 of a pocket-money tracker. Which feature is a MUST-HAVE? (a) pie-chart colours (b) savings stickers (c) add money spent (d) export to a file

Answer key

  1. less code to write
  2. Yes
  3. release an update
  4. line 3
  5. test it again
  6. 2
  7. 90
  8. 2
  9. Test 2
  10. Welcome!
  11. people reading the code
  12. a learning app
  13. 30
  14. 0
  15. a pop-up message
  16. add a homework task
  17. your high score
  18. Design B
  19. tiny tap areas
  20. the idea stage
  21. pick a theme colour
  22. 43
  23. fair
  24. a dark mode
  25. sorting the scores
  26. True
  27. False
  28. Bronze
  29. actual is not expected
  30. Use 4 digits
  31. 4
  32. a picture goes here
  33. a medicine reminder
  34. True
  35. 570
  36. 40
  37. False
  38. 3
  39. True
  40. add money spent

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