App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 861 · 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.🧪 How many of these test cases pass?
   🚚 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(1100) → expected 0
   Test 2: delivery(600) → expected 40
   Test 3: delivery(800) → expected 0
2. 2.True or false: an app is installed on a phone. (a) True (b) False
3. 3.♿ Why add captions to videos? (a) to hide the sound (b) so anyone can follow (c) to slow them down (d) to add colour
4. 4.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
   line 1: let coins = 34; // start at 33
   line 2: coins = coins - 2; // take away 2
   line 3: coins = coins + 4; // add 4
   line 4: show(coins); // show it
5. 5.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
6. 6.Which of these app ideas solves no real problem? (a) a bill splitter (b) a medicine reminder (c) a button with no action (d) a lost-and-found board
7. 7.🎯 Who are the users of an app? (a) only the coders (b) only the testers (c) the app icons (d) the people who use it
8. 8.🗒️ You are planning version 1 of a bus tracker. Which feature is a MUST-HAVE? (a) change the bus icon (b) pick your bus stop (c) rate the driver (d) a dark mode
9. 9.🔁 What does a loop do? (a) saves photos (b) draws icons (c) deletes code (d) repeats code
10. 10.🧭 Which part of navigation opens a list of pages? (a) a menu button (b) the back button (c) a tab bar
11. 11.💡 Does an app idea like a free study-room finder solve a real problem? (a) No (b) Yes
12. 12.🗒️ Version 1 of a pocket-money tracker must be ready in 12 days. How many days are left for extras after the must-haves?
    add money received: 1 days
    add money spent: 1 days
    show the balance: 5 days
13. 13.🧪 How many of these test cases pass?
    🚚 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(400) → expected 40
    Test 3: delivery(750) → expected 0
14. 14.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
15. 15.True or false: a times-table quiz is a health app. (a) False (b) True
16. 16.Which of these is true of a wireframe? (a) shows the real fonts (b) has the real colours (c) uses the final pictures (d) has no real colours
17. 17.👥 A school app has 295 students, 80 teachers and 30 parents as users. How many users does it have in all?
18. 18.🔁 What number does this code show?
    let steps = [20, 5, 16];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
19. 19.✏️ A box with a cross in a wireframe usually means ___. (a) an error (b) a closed app (c) delete this (d) a picture goes here
20. 20.🧩 Scores, notes and settings that an app keeps are called ___. (a) tabs (b) screens (c) data (d) buttons
21. 21.👆 The user types Riya in nameBox and taps the button 1 time. What does the label show?
    button.onTap = function () {
      label.text = "Well done, " + nameBox.text + "!";
    }; (a) Well done, Riya! (b) Well done, nameBox.text! (c) Well done! (d) Riya
22. 22.🔢 When you make an app, which comes first: “plan the screens” or “release it”? (a) plan the screens (b) release it
23. 23.🧩 Which part lets the user give the app information? (a) an icon (b) a title (c) a logo (d) an input
24. 24.True or false: a library due-date alert solves a real problem. (a) True (b) False
25. 25.💡 Which app idea solves this problem: friends argue over who pays? (a) a homework planner (b) a study-room finder (c) a bill splitter (d) a medicine reminder
26. 26.🧩 Which of these is a button on this screen?
    [title] Add Homework
    [text box] Due date
    [button] Next
    [text box] Notes (a) Due date (b) Next (c) Notes
27. 27.🧰 What does this code show?
    function greet(name) {
      return "Hello, " + name + "!";
    }
    show(greet("Zoya")); (a) Zoya (b) Hello, name! (c) greet (d) Hello, Zoya!
28. 28.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
29. 29.Which of these happens at the build stage? (a) put it on an app store (b) pick the features (c) write the code (d) spot a problem to solve
30. 30.🔢 After an app is released, what comes right after “test it again”? (a) fix and improve (b) list what to fix (c) release an update (d) read user reviews
31. 31.🎯 Which app would help this user most: a gamer who forgets to drink? (a) a pocket-money tracker (b) a water reminder (c) a homework planner (d) a big-text reader
32. 32.✏️ What is a wireframe? (a) the finished app (b) a type of password (c) a simple screen sketch (d) a charging cable
33. 33.🚀 Your app is at version 1.11.2. The next release fixes a small bug. What is its version number? (a) 1.11.3 (b) 2.0.0 (c) 1.12.0 (d) 1.12.2
34. 34.🗒️ You are planning version 1 of a quiz app. Which feature is a MUST-HAVE? (a) confetti effects (b) an avatar shop (c) background music (d) check the answer
35. 35.True or false: buttons almost touching is good button design. (a) True (b) False
36. 36.👆 The user taps the button 6 times. What number does the label show now?
    let coins = 8;
    button.onTap = function () {
      coins = coins + 1;
      label.text = coins;
    };
37. 37.⚙️ In an app, is a beep sound an input, processing or an output? (a) processing (b) input (c) output
38. 38.⚙️ What number does this app show?
    let price = 30; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);
39. 39.🗒️ Version 1 of a bus tracker must be ready in 12 days. How many days are left for extras after the must-haves?
    see where the bus is: 3 days
    show arrival time: 1 days
    pick your bus stop: 4 days
40. 40.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 43; // start at 43
    line 2: stars = stars + 7; // add 4
    line 3: stars = stars * 2; // double it
    line 4: stars = stars - 4; // take away 4
    line 5: show(stars); // show it

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