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App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 978 · 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 number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(70, 5));
  2. 2.🔁 What number does this code show?
    let steps = [4, 2, 19];
    let best = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] > best) {
        best = steps[i];
      }
    }
    show(best);
  3. 3.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(60, 4));
  4. 4.🚀 What should an app ask for only when it really needs it? (a) its name (b) its icon (c) a font (d) a permission
  5. 5.🗂️ What kind of app is a cricket run chase? (a) a learning app (b) a health app (c) a game (d) a tool app
  6. 6.🔢 After an app is released, what comes right after “list what to fix”? (a) release an update (b) fix and improve (c) test it again (d) read user reviews
  7. 7.🔀 What number does this shop app show?
    let total = 290;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
  8. 8.Which of these helps everyone use the app? (a) strong colour contrast (b) sudden loud sounds (c) icons with no labels (d) tiny tap areas
  9. 9.Which of these is a button? (a) tap to go Next (b) the log-in page (c) a slider for volume (d) the game-over page
  10. 10.💡 Which app idea solves this problem: pupils forget due dates? (a) a bill splitter (b) a lost-and-found board (c) a homework planner (d) a medicine reminder
  11. 11.🔢 In a food-order flow, what comes right after “check the cart”? (a) pick a dish (b) pay for the order (c) track the order (d) open the menu
  12. 12.🔀 When does the else part run? (a) always (b) when the test is false (c) never (d) when the test is true
  13. 13.True or false: a final design uses the final pictures. (a) False (b) True
  14. 14.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let lives = 36; // start at 36
    line 2: lives = lives + 2; // double it
    line 3: lives = lives + 6; // add 6
    line 4: show(lives); // show it     (a) line 3 (b) line 2 (c) line 1
  15. 15.Which of these app ideas solves a real problem? (a) a blank grey screen (b) an app that just says hi (c) a bill splitter (d) a page of random dots
  16. 16.🔀 What does this sign-up rule show?
    let age = 8;
    if (age >= 13) {
      show("Welcome!");
    } else {
      show("Ask a parent");
    }     (a) Ask a parent (b) Welcome!
  17. 17.💾 What is a variable? (a) a type of screen (b) a picture (c) a phone setting (d) a named box for a value
  18. 18.🧩 Which of these is a button on this screen?
    [title] Sign Up
    [text box] City
    [button] Start
    [button] Next
    [button] Done
    [switch] Remind me
    [slider] Volume     (a) City (b) Remind me (c) Done (d) Volume
  19. 19.Which of these app ideas solves no real problem? (a) a medicine reminder (b) a bill splitter (c) a blank grey screen (d) a library due-date alert
  20. 20.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) pick your bus stop (b) show arrival time (c) change the bus icon (d) see where the bus is
  21. 21.⚙️ 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);
  22. 22.🖼️ In this wireframe (top to bottom), what is right above the filter buttons?
    [ title text ]
    [ big picture ]
    [ filter buttons ]
    [ list of items ]
    [ Save button ]
    [ search box ]     (a) list of items (b) big picture (c) search box (d) title text
  23. 23.💡 Does an app idea like a page of random dots solve a real problem? (a) Yes (b) No
  24. 24.True or false: a racing challenge is a game. (a) True (b) False
  25. 25.🎯 Is this a user need or a feature: “What should I cook?”? (a) a user need (b) a feature
  26. 26.🔁 What number does this code show?
    let runs = [69, 44, 90];
    let count = 0;
    for (let i = 0; i < runs.length; i++) {
      if (runs[i] >= 40) {
        count = count + 1;
      }
    }
    show(count);
  27. 27.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Title: 10 px
    Footer: 18 px
    Menu: 12 px
    Caption: 10 px
    Hint: 10 px
  28. 28.🧭 The app has tabs Feed, Chat, Settings. You start on Feed, then:
    1. open “Badges”
    2. open “Badges”
    3. tap Back
    4. tap the Chat tab
    How many times must you tap Back to reach the main screen of this tab?
  29. 29.True or false: a homework planner is the best fit for a gamer who forgets to drink. (a) True (b) False
  30. 30.True or false: a birthday list of friends needs your location. (a) True (b) False
  31. 31.🚀 Which of these versions is the OLDEST?
    2.21.9, 3.16.9, 3.10.9, 3.6.2     (a) 2.21.9 (b) 3.10.9 (c) 3.6.2 (d) 3.16.9
  32. 32.True or false: a result on screen is an output. (a) False (b) True
  33. 33.♿ What should every icon-only button have for screen readers? (a) a bright colour (b) a sound (c) a long animation (d) a text label
  34. 34.🔀 What does this battery rule show?
    let battery = 72;
    if (battery < 20) {
      show("Low battery");
    } else {
      show("Battery OK");
    }     (a) Low battery (b) Battery OK
  35. 35.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    missing the bus: 7 votes
    wasting pocket money: 5 votes
    no quiet study place: 15 votes     (a) wasting pocket money (b) no quiet study place (c) missing the bus
  36. 36.🎨 Is this about UI or UX: how easy sign-up is? (a) UX (b) UI
  37. 37.🔀 What does this PIN rule show?
    let pin = "7249";
    if (pin.length === 4) {
      show("PIN saved");
    } else {
      show("Use 4 digits");
    }     (a) Use 4 digits (b) PIN saved
  38. 38.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 10, and 100 for everyone else.
    function price(age) {
      if (age <= 10) {
        return 50;
      }
      return 100;
    }
    Test 1: price(11) → expected 100
    Test 2: price(6) → expected 50
    Test 3: price(10) → expected 100     (a) Test 2 (b) Test 1 (c) Test 3
  39. 39.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let points = 35; // start at 35
    line 2: points = points - 3; // take away 2
    line 3: points = points - 1; // take away 1
    line 4: show(points); // show it     (a) line 1 (b) line 3 (c) line 2
  40. 40.🔁 What is the LAST line this code shows?
    let names = ["Meera", "Kabir", "Riya"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    }     (a) Hi, Meera (b) Hi, Riya (c) Hi, Kabir

Answer key

  1. 350
  2. 19
  3. 240
  4. a permission
  5. a game
  6. fix and improve
  7. 290
  8. strong colour contrast
  9. tap to go Next
  10. a homework planner
  11. pay for the order
  12. when the test is false
  13. True
  14. line 2
  15. a bill splitter
  16. Ask a parent
  17. a named box for a value
  18. Done
  19. a blank grey screen
  20. change the bus icon
  21. 50
  22. big picture
  23. No
  24. True
  25. a user need
  26. 3
  27. 4
  28. 0
  29. False
  30. False
  31. 2.21.9
  32. True
  33. a text label
  34. Battery OK
  35. no quiet study place
  36. UX
  37. PIN saved
  38. Test 3
  39. line 2
  40. Hi, Riya

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