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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 135 · 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.🖼️ In this wireframe (top to bottom), what is right below the list of items?
    [ Save button ]
    [ tab bar ]
    [ list of items ]
    [ title text ]     (a) title text (b) Save button (c) tab bar
  2. 2.🔐 Which permission does a speak-to-type notes app really need? (a) the camera (b) contacts (c) location (d) the microphone
  3. 3.🔁 What number does this code show?
    let scores = [96, 21, 82];
    let count = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] >= 40) {
        count = count + 1;
      }
    }
    show(count);
  4. 4.👆 The user types Meera in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Welcome, " + nameBox.text + "!";
    };     (a) Welcome, nameBox.text! (b) Welcome, Meera! (c) Meera (d) Welcome!
  5. 5.🧪 What is the actual result of a test? (a) the test’s number (b) what the app really does (c) the app’s name (d) what we hope for
  6. 6.🔢 When you make an app, which comes first: “plan the screens” or “release it”? (a) release it (b) plan the screens
  7. 7.📱 Which one opens from a link: an app or a website? (a) a website (b) an app
  8. 8.🔢 In a quiz-app flow, which comes first: “read a question” or “tap “Start quiz””? (a) read a question (b) tap “Start quiz”
  9. 9.🧩 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
  10. 10.🔁 What is the LAST line this code shows?
    let names = ["Kabir", "Meera", "Zoya", "Aman", "Riya"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    }     (a) Hi, Kabir (b) Hi, Meera (c) Hi, Riya (d) Hi, Zoya
  11. 11.🎯 Which app would help this user most: a student who keeps forgetting due dates? (a) a homework planner (b) a bus tracker (c) a recipe finder (d) a pocket-money tracker
  12. 12.🔀 What does this PIN rule show?
    let pin = "7623";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) Use 4 digits (b) PIN saved
  13. 13.🗒️ Version 1 of a homework planner must be ready in 13 days. How many days are left for extras after the must-haves?
    add a homework task: 3 days
    set a due date: 4 days
    see tasks by day: 4 days
  14. 14.👥 A cricket club app has 225 players, 115 coaches and 75 fans as users. How many more coaches than fans are there?
  15. 15.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
    1. open “Score card”
    2. open “Match report”
    3. open “Match report”
    4. tap the Search tab
    5. open “Score card”
    Which screen are you on now?     (a) Score card (b) Home (c) Match report (d) Search
  16. 16.🧪 What is the ACTUAL result of Test 1?
    🚚 Rule: delivery is free (0) when the order is 600 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 600) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(600) → expected 0
    Test 2: delivery(850) → expected 0
    Test 3: delivery(550) → expected 40
  17. 17.👆 What kind of event is this: the user types a letter? (a) a tap event (b) a timer event (c) a text event (d) a load event
  18. 18.🧩 Scores, notes and settings that an app keeps are called ___. (a) data (b) buttons (c) tabs (d) screens
  19. 19.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
  20. 20.♿ What should every icon-only button have for screen readers? (a) a text label (b) a long animation (c) a sound (d) a bright colour
  21. 21.🧩 In an app, what is your high score? (a) a button (b) a screen (c) data (d) an input
  22. 22.👆 The user taps the button 2 times. What number does the label show now?
    let likes = 0;
    button.onTap = function () {
      if (likes < 4) {
        likes = likes + 1;
      }
      label.text = likes;
    };
  23. 23.🧰 In function tip(bill), what is bill? (a) a parameter (b) a screen (c) a loop (d) an event
  24. 24.Which of these is true of a wireframe? (a) uses the final pictures (b) shows the real fonts (c) has the real colours (d) shows where things go
  25. 25.🔁 What number does this code show?
    let steps = [16, 5, 5];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
  26. 26.🔁 What number does this code show?
    let scores = [12, 19, 17, 6, 14];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
  27. 27.👆 What kind of event is this: the screen first opens? (a) a tap event (b) a timer event (c) a text event (d) a load event
  28. 28.Which colour pair is easy to read? (a) light grey on white (b) black on yellow (c) pale pink on white (d) yellow on white
  29. 29.🐞 A comment in code (after //) is for ___. (a) the phone screen (b) the app store (c) the battery (d) people reading the code
  30. 30.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Cancel button: 40 px tall
    Help button: 48 px tall
    Done button: 52 px tall
  31. 31.🧪 A test case is an input together with its ___. (a) app icon (b) screen colour (c) expected result (d) font size
  32. 32.🧰 What number does this code show?
    function points(stars) {
      return stars * 10 + 5;
    }
    show(points(3) + points(3));
  33. 33.True or false: a blank grey screen solves no real problem. (a) True (b) False
  34. 34.🧪 How many of these test cases pass?
    🚚 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(650) → expected 0
    Test 2: delivery(100) → expected 40
    Test 3: delivery(500) → expected 0
  35. 35.True or false: a wireframe has no real colours. (a) True (b) False
  36. 36.🔍 Which is the odd one out? (a) typing your age (b) tapping a button (c) taking a photo (d) sorting the scores
  37. 37.🧭 Where is a tab bar usually placed in a phone app? (a) in the middle (b) nowhere (c) at the bottom (d) inside a button
  38. 38.👥 A school app has 155 students, 60 teachers and 55 parents as users. Which user group is the biggest? (a) parents (b) students (c) teachers
  39. 39.🌐 Which program do you need to open a website? (a) a camera app (b) a web browser (c) an app store (d) a calculator
  40. 40.🧰 What number does this code show?
    function double(n) {
      return n * 2;
    }
    show(double(12));

Answer key

  1. title text
  2. the microphone
  3. 2
  4. Welcome, Meera!
  5. what the app really does
  6. plan the screens
  7. a website
  8. tap “Start quiz”
  9. starts an action
  10. Hi, Riya
  11. a homework planner
  12. PIN saved
  13. 2
  14. 40
  15. Score card
  16. 40
  17. a text event
  18. data
  19. easy to read
  20. a text label
  21. data
  22. 2
  23. a parameter
  24. shows where things go
  25. 26
  26. 68
  27. a load event
  28. black on yellow
  29. people reading the code
  30. 2
  31. expected result
  32. 70
  33. True
  34. 3
  35. True
  36. sorting the scores
  37. at the bottom
  38. students
  39. a web browser
  40. 24

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