App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 677 · 40 questions

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.

1. 1.True or false: a step counter is a tool app. (a) True (b) False
2. 2.🧪 What is the ACTUAL result of Test 1?
   🚚 Rule: delivery is free (0) when the order is 800 or more; otherwise it costs 40.
   function delivery(total) {
     if (total > 800) {
       return 0;
     }
     return 40;
   }
   Test 1: delivery(650) → expected 40
   Test 2: delivery(800) → expected 0
   Test 3: delivery(850) → expected 0
3. 3.🔁 What is the LAST line this code shows?
   let names = ["Zoya", "Meera", "Riya", "Aman"];
   for (let i = 0; i < names.length; i++) {
     show("Hi, " + names[i]);
   } (a) Hi, Zoya (b) Hi, Riya (c) Hi, Aman (d) Hi, Meera
4. 4.🗒️ The first small, working version of an app is often called an ___. (a) FAQ (b) CPU (c) URL (d) MVP
5. 5.👆 The user taps the button 3 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
6. 6.🔍 Which is the odd one out? (a) labels on every icon (b) text that can grow (c) tiny tap areas (d) strong colour contrast
7. 7.💡 Which app idea solves this problem: nobody knows whose bag it is? (a) a medicine reminder (b) a homework planner (c) a lost-and-found board (d) a bill splitter
8. 8.🔁 list.length tells you ___. (a) how many items it has (b) the first item (c) the biggest item (d) the last item
9. 9.📱 Which one has a home-screen icon: an app or a website? (a) an app (b) a website
10. 10.🔁 What number does this code show?
    let marks = [40, 52, 39];
    let count = 0;
    for (let i = 0; i < marks.length; i++) {
      if (marks[i] >= 40) {
        count = count + 1;
      }
    }
    show(count);
11. 11.True or false: a website has a web address. (a) False (b) True
12. 12.👆 The user taps the button 6 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) ON (b) OFF
13. 13.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 7 or more right answers.
    function result(right) {
      if (right > 7) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(8) → expected Pass
    Test 2: result(7) → expected Pass
    Test 3: result(5) → expected Try again (a) Test 1 (b) Test 2 (c) Test 3
14. 14.🧭 Which part of navigation sits at the bottom? (a) the back button (b) a menu button (c) a tab bar
15. 15.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let coins = 49; // start at 49
    line 2: coins = coins + 7; // add 6
    line 3: coins = coins - 1; // take away 1
    line 4: coins = coins * 2; // double it
    line 5: show(coins); // show it (a) line 4 (b) line 2 (c) line 1 (d) line 3
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 42; // typed by the user
    line 2: let friends = 2; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 4 (c) line 2 (d) line 3
17. 17.🧩 Which of these is a button on this screen?
    [title] Add Homework
    [text box] Notes
    [button] Save
    [slider] Volume
    [button] Back
    [button] Cancel (a) Save (b) Volume (c) Notes
18. 18.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let coins = 50; // start at 50
    line 2: coins = coins + 6; // add 6
    line 3: coins = coins + 3; // take away 3
    line 4: show(coins); // show it
19. 19.🔢 In a quiz-app flow, which comes first: “see if it is right” or “see the final score”? (a) see the final score (b) see if it is right
20. 20.True or false: a final design looks like the real app. (a) True (b) False
21. 21.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let coins = 32; // start at 32
    line 2: coins = coins - 4; // take away 4
    line 3: coins = coins + 4; // add 4
    line 4: coins = coins + 6; // add 5
    line 5: show(coins); // show it
22. 22.🐞 After fixing a bug you should ___. (a) test it again (b) never test (c) release at once (d) delete the test
23. 23.🔘 Our rule: buttons are at least 48 px tall. The Help button is 36 px tall. How many px taller must it be?
24. 24.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 30; // typed by the user
    line 2: let qty = 2; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 4 (b) line 1 (c) line 3 (d) line 2
25. 25.🧭 Tapping a tab usually takes you to ___. (a) the phone settings (b) a random page (c) that tab’s main screen (d) the last app used
26. 26.True or false: taking a photo is an output. (a) True (b) False
27. 27.🧪 A test fails when ___. (a) the app is new (b) both are the same (c) the font is big (d) actual is not expected
28. 28.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Title: 19 px
    Body text: 20 px
    Hint: 20 px
    Footer: 12 px (a) Body text (b) Footer (c) Hint (d) Title
29. 29.🧩 Which of these is a button on this screen?
    [title] Edit Profile
    [button] Save
    [button] Cancel
    [text box] Phone
    [text box] Age
    [text box] City (a) Phone (b) City (c) Age (d) Save
30. 30.🧪 What is the ACTUAL result of Test 1?
    🎟️ Rule: a ticket costs 50 for children under 8, and 100 for everyone else.
    function price(age) {
      if (age <= 8) {
        return 50;
      }
      return 100;
    }
    Test 1: price(11) → expected 100
    Test 2: price(9) → expected 100
    Test 3: price(7) → expected 50
31. 31.🖼️ In this wireframe (top to bottom), which part is at the very bottom?
    [ big picture ]
    [ search box ]
    [ list of items ]
    [ title text ]
    [ Save button ] (a) title text (b) Save button (c) list of items (d) big picture
32. 32.Which of these is true of a wireframe? (a) shows the real fonts (b) uses plain grey boxes (c) looks like the real app (d) uses the final pictures
33. 33.🧭 Which part of navigation switches main sections? (a) the back button (b) a tab bar (c) a menu button
34. 34.Which of these is a user need? (a) “I keep missing the bus” (b) a search bar (c) a dark mode switch (d) a reminder alarm
35. 35.🗒️ When should nice-to-have features be built? (a) before anything (b) never (c) after the must-haves (d) on day one
36. 36.🔢 In a sign-up flow, what comes right after “enter the code sent”? (a) type name and email (b) make a password (c) open the app (d) see the home screen
37. 37.🔐 Which permission does a barcode scanner really need? (a) the microphone (b) contacts (c) location (d) the camera
38. 38.🔐 Is this permission request fair or too much: voice notes → microphone? (a) too much (b) fair
39. 39.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let score = 30; // start at 30
    line 2: score = score * 2; // double it
    line 3: score = score + 6; // add 4
    line 4: score = score * 2; // double it
    line 5: show(score); // show it
40. 40.👆 What kind of event is this: a finger hits Like? (a) a load event (b) a tap event (c) a text event (d) a timer event

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