App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 378 · 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.🔐 A torch app asks for your contacts. What should you do? (a) share them all (b) post them online (c) allow it (d) deny it
2. 2.Which of these requests asks for too much? (a) calling app → contacts (b) map app → location (c) voice notes → microphone (d) quiz app → microphone
3. 3.⚙️ What number does this app show?
   let price = 510; // typed by the user
   let off = 20; // typed by the user
   let pay = price - off;
   show(pay);
4. 4.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 68 px tall
   Help button: 48 px tall
   Send button: 28 px tall
   Back button: 56 px tall (a) Send (b) Cancel (c) Back (d) Help
5. 5.🖼️ In this wireframe (top to bottom), what is right above the title text?
   [ Add button ]
   [ filter buttons ]
   [ top bar ]
   [ title text ]
   [ list of items ]
   [ big picture ] (a) Add button (b) list of items (c) big picture (d) top bar
6. 6.💡 Which app idea solves this problem: bottles go missing at school? (a) a study-room finder (b) a medicine reminder (c) a homework planner (d) a lost-and-found board
7. 7.🔍 Which is the odd one out? (a) checking a password (b) speaking a command (c) taking a photo (d) typing your age
8. 8.🔢 In a food-order flow, which comes FIRST? (a) pay for the order (b) add it to the cart (c) open the menu (d) pick a dish
9. 9.🧩 In an app, what is the game-over page? (a) a button (b) data (c) a screen (d) an input
10. 10.💡 Which app idea solves this problem: friends argue over who pays? (a) a lost-and-found board (b) a study-room finder (c) a bill splitter (d) a medicine reminder
11. 11.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Title: 18 px
    Caption: 12 px
    Body text: 26 px
    Label: 20 px (a) Title (b) Label (c) Body text (d) Caption
12. 12.🧪 One test case fails. Which one?
    🎟️ Rule: a ticket costs 50 for children under 9, and 100 for everyone else.
    function price(age) {
      if (age <= 9) {
        return 50;
      }
      return 100;
    }
    Test 1: price(6) → expected 50
    Test 2: price(14) → expected 100
    Test 3: price(9) → expected 100 (a) Test 1 (b) Test 2 (c) Test 3
13. 13.🧰 In function tip(bill), what is bill? (a) a parameter (b) an event (c) a loop (d) a screen
14. 14.🔀 When does the else part run? (a) never (b) always (c) when the test is false (d) when the test is true
15. 15.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting birthdays: 5 votes
    wasting pocket money: 12 votes
    losing water bottles: 4 votes (a) losing water bottles (b) forgetting birthdays (c) wasting pocket money
16. 16.🔍 Which is the odd one out? (a) captions on videos (b) labels on every icon (c) sudden loud sounds (d) big touch targets
17. 17.🔢 In a food-order flow, what comes right after “pick a dish”? (a) open the menu (b) add it to the cart (c) check the cart (d) track the order
18. 18.🔢 In a food-order flow, which comes first: “pick a dish” or “track the order”? (a) track the order (b) pick a dish
19. 19.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 310; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 1 (c) line 3 (d) line 2
20. 20.📊 Survey: which problem bugs you most? How many students voted in all?
    losing water bottles: 23 votes
    no quiet study place: 18 votes
    wasting pocket money: 4 votes
21. 21.💾 Which works with no internet at all? (a) a shared chat (b) a cloud backup (c) data saved on the phone (d) a cloud leaderboard
22. 22.👆 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) OFF (b) ON
23. 23.🔁 What number does this code show?
    let steps = [10, 5, 17, 19, 7];
    let best = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] > best) {
        best = steps[i];
      }
    }
    show(best);
24. 24.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    missing the bus: 19 votes
    no quiet study place: 12 votes
    losing water bottles: 7 votes (a) missing the bus (b) no quiet study place (c) losing water bottles
25. 25.🎨 A beautiful app that confuses everyone has ___. (a) perfect UX (b) good UX but poor UI (c) no UI at all (d) good UI but poor UX
26. 26.🧪 A test fails when ___. (a) the app is new (b) the font is big (c) both are the same (d) actual is not expected
27. 27.♿ Does this help everyone, or make the app harder to use: tiny tap areas? (a) helps everyone (b) makes it harder
28. 28.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 48 px tall
    Help button: 64 px tall
    Cancel button: 56 px tall
    Done button: 44 px tall
29. 29.🧩 What does a button do when you tap it? (a) shows the time (b) saves the battery (c) starts an action (d) changes the phone
30. 30.🔢 When you make an app, which comes first: “get an idea” or “build the app”? (a) get an idea (b) build the app
31. 31.True or false: you put it on an app store at the release stage. (a) True (b) False
32. 32.🧰 What is a function? (a) a list of colours (b) a type of phone (c) a screen size (d) a named block of code
33. 33.Which of these happens at the idea stage? (a) spot a problem to solve (b) let friends try it (c) pick the features (d) try every button
34. 34.🔁 What number does this code show?
    let scores = [11, 7, 8, 6];
    let best = 0;
    for (let i = 0; i < scores.length; i++) {
      if (scores[i] > best) {
        best = scores[i];
      }
    }
    show(best);
35. 35.🧪 How many of these test cases pass?
    🎟️ Rule: a ticket costs 50 for children under 13, and 100 for everyone else.
    function price(age) {
      if (age < 13) {
        return 50;
      }
      return 100;
    }
    Test 1: price(17) → expected 100
    Test 2: price(11) → expected 50
    Test 3: price(15) → expected 100
36. 36.True or false: the game-over page is an input. (a) False (b) True
37. 37.🧩 Which input is best for turning something ON or OFF? (a) a title (b) a text box (c) a slider (d) a switch
38. 38.📊 Survey: which problem bugs you most? How many more votes did “no quiet study place” get than “wasting pocket money”?
    wasting pocket money: 5 votes
    losing water bottles: 3 votes
    no quiet study place: 12 votes
39. 39.🔁 What is the LAST line this code shows?
    let names = ["Riya", "Arjun", "Kabir"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Kabir (b) Hi, Arjun (c) Hi, Riya
40. 40.🧩 What do we call one full page of an app? (a) a variable (b) a cable (c) a screen (d) a battery

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