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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 890 · 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.🔀 What does this PIN rule show?
    let pin = "25520";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) Use 4 digits (b) PIN saved
  2. 2.👆 The user taps the button 1 times. What does the label show now?
    let on = false;
    button.onTap = function () {
      on = !on;
      if (on) {
        label.text = "ON";
      } else {
        label.text = "OFF";
      }
    };     (a) OFF (b) ON
  3. 3.True or false: a button with no action solves a real problem. (a) True (b) False
  4. 4.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 45; // start at 45
    line 2: lives = lives + 4; // add 4
    line 3: lives = lives * 3; // double it
    line 4: lives = lives - 3; // take away 3
    line 5: show(lives); // show it     (a) line 4 (b) line 2 (c) line 1 (d) line 3
  5. 5.📊 Survey: which problem bugs you most? How many more votes did “missing the bus” get than “forgetting birthdays”?
    missing the bus: 17 votes
    forgetting homework: 12 votes
    forgetting birthdays: 13 votes
  6. 6.Which colour pair is easy to read? (a) black on yellow (b) red on green (c) pale pink on white (d) light grey on white
  7. 7.🗒️ Version 1 of a water reminder must be ready in 12 days. How many days are left for extras after the must-haves?
    set a reminder time: 4 days
    log a glass of water: 3 days
    see today’s total: 3 days
  8. 8.True or false: the sound on/off setting fits saving on the phone. (a) True (b) False
  9. 9.True or false: a cricket run chase is a game. (a) False (b) True
  10. 10.📊 Survey: which problem bugs you most? How many students voted in all?
    no quiet study place: 11 votes
    losing water bottles: 14 votes
    wasting pocket money: 9 votes
  11. 11.Which colour pair is easy to read? (a) white on black (b) dark blue on black (c) light grey on white (d) pale pink on white
  12. 12.💡 Which app idea solves this problem: a patient misses doses? (a) a lost-and-found board (b) a homework planner (c) a medicine reminder (d) a bill splitter
  13. 13.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
  14. 14.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(40, 2));
  15. 15.🗒️ Version 1 of a water reminder must be ready in 13 days. How many days are left for extras after the must-haves?
    set a reminder time: 1 days
    log a glass of water: 2 days
    see today’s total: 4 days
  16. 16.🔀 Which badge does this quiz app show?
    let marks = 69;
    if (marks >= 80) {
      show("Gold");
    } else if (marks >= 50) {
      show("Silver");
    } else {
      show("Bronze");
    }     (a) Gold (b) Bronze (c) Silver
  17. 17.True or false: a homework photo scanner needs the microphone. (a) True (b) False
  18. 18.🎯 Is this a user need or a feature: “What should I cook?”? (a) a user need (b) a feature
  19. 19.🗒️ 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) change the bus icon
  20. 20.💡 A good app idea starts with ___. (a) a cool logo (b) a long name (c) many colours (d) a problem to solve
  21. 21.📊 Survey: which problem bugs you most? How many more votes did “forgetting birthdays” get than “no quiet study place”?
    no quiet study place: 8 votes
    wasting pocket money: 6 votes
    forgetting birthdays: 13 votes
  22. 22.🧰 What number does this code show?
    function triple(n) {
      return n * 3;
    }
    show(triple(32));
  23. 23.🔀 What does if / else let an app do? (a) save a photo (b) pick one of two actions (c) repeat forever (d) draw a screen
  24. 24.🔁 What number does this code show?
    let runs = [12, 12, 8];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
  25. 25.True or false: a water reminder is a health app. (a) True (b) False
  26. 26.👆 Two designs for the same task (each arrow is one tap). Which needs FEWER taps?
    Design A: Home → Pay → Menu → Address → Shop
    Design B: Home → Cart → Shop → Size     (a) Design A (b) Design B
  27. 27.🚀 Which version is newer: 4.3.1 or 4.17.3? (a) 4.17.3 (b) 4.3.1
  28. 28.♿ A screen has 5 icon buttons. Only 1 of them have a text label for screen readers. How many still need a label?
  29. 29.🎯 Which app would help this user most: a gamer who forgets to drink? (a) a big-text reader (b) a pocket-money tracker (c) a water reminder (d) a bus tracker
  30. 30.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting birthdays: 21 votes
    losing water bottles: 7 votes
    wasting pocket money: 6 votes     (a) forgetting birthdays (b) wasting pocket money (c) losing water bottles
  31. 31.🔁 What number does this code show?
    let scores = [3, 8, 6, 20];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
  32. 32.🗒️ Version 1 of a pocket-money tracker must be ready in 11 days. How many days are left for extras after the must-haves?
    add money received: 2 days
    add money spent: 3 days
    show the balance: 2 days
  33. 33.True or false: a clear word like Save is poor button design. (a) False (b) True
  34. 34.🔁 What number does this code show?
    let runs = [1, 3, 14, 19, 16];
    let best = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] > best) {
        best = runs[i];
      }
    }
    show(best);
  35. 35.🎯 Who are the users of an app? (a) the app icons (b) only the testers (c) the people who use it (d) only the coders
  36. 36.💡 After a survey, which need should version 1 solve? (a) the rarest need (b) the newest trend (c) the most common need (d) a random need
  37. 37.🗒️ Version 1 of a pocket-money tracker must be ready in 6 days. How many days are left for extras after the must-haves?
    add money received: 1 days
    add money spent: 2 days
    show the balance: 2 days
  38. 38.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 72 px tall
    Save button: 40 px tall
    Back button: 48 px tall     (a) Next (b) Back (c) Save
  39. 39.🧩 Which input is best for typing your name? (a) a text box (b) a switch (c) a picture (d) a slider
  40. 40.🔀 What is a user flow? (a) a colour theme (b) the path through screens (c) a type of font (d) a charging cable

Answer key

  1. Use 4 digits
  2. ON
  3. False
  4. line 3
  5. 4
  6. black on yellow
  7. 2
  8. True
  9. True
  10. 34
  11. white on black
  12. a medicine reminder
  13. good design
  14. 80
  15. 6
  16. Silver
  17. False
  18. a user need
  19. change the bus icon
  20. a problem to solve
  21. 5
  22. 96
  23. pick one of two actions
  24. 32
  25. True
  26. Design B
  27. 4.17.3
  28. 4
  29. a water reminder
  30. forgetting birthdays
  31. 37
  32. 4
  33. False
  34. 19
  35. the people who use it
  36. the most common need
  37. 1
  38. Save
  39. a text box
  40. the path through screens

Free app development lessons, practice and worksheets at talentjr.in/app-development-for-students