App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 526 · 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.🧪 What is the ACTUAL result of Test 1?
   🚚 Rule: delivery is free (0) when the order is 700 or more; otherwise it costs 40.
   function delivery(total) {
     if (total >= 700) {
       return 0;
     }
     return 40;
   }
   Test 1: delivery(850) → expected 0
   Test 2: delivery(650) → expected 40
   Test 3: delivery(800) → expected 0
2. 2.🔢 In a photo-post flow, what comes right after “open the camera screen”? (a) write a caption (b) post the photo (c) take the photo (d) add a filter
3. 3.🧪 How many of these test cases pass?
   📝 Rule: a quiz is passed with 5 or more right answers.
   function result(right) {
     if (right >= 5) {
       return "Pass";
     }
     return "Try again";
   }
   Test 1: result(3) → expected Try again
   Test 2: result(5) → expected Pass
   Test 3: result(6) → expected Pass
4. 4.🧪 A test case is an input together with its ___. (a) font size (b) app icon (c) screen colour (d) expected result
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.🧰 In function tip(bill), what is bill? (a) a loop (b) a screen (c) a parameter (d) an event
7. 7.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Start button: 40 px tall
   Save button: 72 px tall
   Next button: 52 px tall
   Back button: 64 px tall (a) Save (b) Back (c) Next (d) Start
8. 8.🔀 In this course’s code, which sign tests “is equal to”? (a) === (b) = (c) => (d) !==
9. 9.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Start button: 36 px tall
   Help button: 48 px tall
   Send button: 48 px tall
10. 10.Which of these app ideas solves no real problem? (a) a library due-date alert (b) a lost-and-found board (c) a page of random dots (d) a bill splitter
11. 11.🔢 In a photo-post flow, which comes first: “post the photo” or “take the photo”? (a) post the photo (b) take the photo
12. 12.📴 Which of these can often still work with no internet? (a) a new website (b) a video call (c) an installed app (d) an online search
13. 13.🔀 When does the else part run? (a) never (b) when the test is false (c) when the test is true (d) always
14. 14.👆 What kind of event is this: one second passes? (a) a load event (b) a tap event (c) a text event (d) a timer event
15. 15.⚙️ What number does this app show?
    let bill = 57; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
16. 16.🎯 Which app would help this user most: a student who keeps forgetting due dates? (a) a homework planner (b) a pocket-money tracker (c) a water reminder (d) a bus tracker
17. 17.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
18. 18.Which of these is true of an app? (a) has a web address (b) needs no installing (c) opens in a web browser (d) is installed on a phone
19. 19.True or false: a step counter is a game. (a) False (b) True
20. 20.🔁 What number does this code show?
    let scores = [20, 3, 17, 20, 2];
    let total = 0;
    for (let i = 0; i < scores.length; i++) {
      total = total + scores[i];
    }
    show(total);
21. 21.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    losing water bottles: 4 votes
    forgetting homework: 5 votes
    forgetting birthdays: 6 votes (a) forgetting birthdays (b) forgetting homework (c) losing water bottles
22. 22.True or false: a water reminder is the best fit for a runner who forgets to sip water. (a) True (b) False
23. 23.🗒️ A to-do app with no “add a task” feature is ___. (a) well planned (b) a nice extra (c) ready to release (d) missing a must-have
24. 24.Which of these is true of a website? (a) opens from a link (b) is installed on a phone (c) updates from the store (d) has a home-screen icon
25. 25.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 170; // typed by the user
    line 2: let off = 40; // typed by the user
    line 3: let pay = price - off;
    line 4: show(pay); (a) line 1 (b) line 2 (c) line 3 (d) line 4
26. 26.🔀 What number does this shop app show?
    let total = 470;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
27. 27.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let score = 42; // start at 40
    line 2: score = score * 2; // double it
    line 3: score = score * 2; // double it
    line 4: show(score); // show it (a) line 1 (b) line 3 (c) line 2
28. 28.True or false: tap to Save is data. (a) False (b) True
29. 29.Which of these fits saving on the phone? (a) a class leaderboard (b) the sound on/off setting (c) chat messages to friends (d) a shared to-do list
30. 30.⚙️ What number does this app show?
    let bill = 90; // typed by the user
    let friends = 5; // typed by the user
    let share = bill / friends;
    show(share);
31. 31.True or false: space between buttons is good button design. (a) True (b) False
32. 32.🧪 What is the ACTUAL result of Test 2?
    🎟️ 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(5) → expected 50
    Test 2: price(8) → expected 100
    Test 3: price(10) → expected 100
33. 33.🔀 What number does this shop app show?
    let total = 880;
    if (total > 500) {
      total = total - 50;
    }
    show(total);
34. 34.🔢 In a food-order flow, which comes first: “open the menu” or “pick a dish”? (a) pick a dish (b) open the menu
35. 35.🗂️ What kind of app is a racing challenge? (a) a learning app (b) a tool app (c) a game (d) a health app
36. 36.👥 A cricket club app has 110 players, 25 coaches and 235 fans as users. Which user group is the biggest? (a) coaches (b) players (c) fans
37. 37.♿ Does this help everyone, or make the app harder to use: text that can grow? (a) helps everyone (b) makes it harder
38. 38.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting birthdays: 3 votes
    missing the bus: 4 votes
    no quiet study place: 6 votes (a) forgetting birthdays (b) missing the bus (c) no quiet study place
39. 39.💾 Which works with no internet at all? (a) a cloud leaderboard (b) data saved on the phone (c) a shared chat (d) a cloud backup
40. 40.🗒️ You are planning version 1 of a water reminder. Which feature is a MUST-HAVE? (a) set a reminder time (b) share your streak (c) custom alert sounds (d) water animations

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