App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 340 · 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 museum app works out the entry fee. What number does this code show?
   function fee(age) {
     if (age < 5) {
       return 0;
     }
     return 20;
   }
   show(fee(10) + fee(3));
2. 2.🧑 Who is an app really made for? (a) its coder only (b) its users (c) its charger (d) its icon
3. 3.🔐 Is this permission request fair or too much: map app → location? (a) fair (b) too much
4. 4.🧩 Which input is best for turning something ON or OFF? (a) a text box (b) a slider (c) a switch (d) a title
5. 5.🔀 When does the else part run? (a) when the test is false (b) never (c) always (d) when the test is true
6. 6.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
   Body text: 26 px
   Caption: 9 px
   Title: 20 px (a) Title (b) Caption (c) Body text
7. 7.🧪 Who else should try an app before release? (a) the app icon (b) nobody (c) real users (d) only the coder
8. 8.True or false: chat messages to friends fits saving in the cloud. (a) True (b) False
9. 9.🔁 What number does this code show?
   let scores = [51, 39, 69, 90];
   let count = 0;
   for (let i = 0; i < scores.length; i++) {
     if (scores[i] >= 60) {
       count = count + 1;
     }
   }
   show(count);
10. 10.📅 An app team plans for 5 days, builds for 7 days, tests for 3 days and releases on 1 more day. How many more days does building take than testing?
11. 11.💡 Does an app idea like a bill splitter 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: 2 days
    add money spent: 3 days
    show the balance: 4 days
13. 13.🧰 What is a function? (a) a type of phone (b) a list of colours (c) a named block of code (d) a screen size
14. 14.📊 Survey: which problem bugs you most? How many students voted in all?
    wasting pocket money: 5 votes
    forgetting birthdays: 4 votes
    forgetting homework: 21 votes
15. 15.💾 What does this code show? (Positions start at 0.)
    let songs = ["Monsoon", "Kites", "Stars"];
    show(songs[2]); (a) Kites (b) Stars (c) Monsoon
16. 16.♿ Showing right or wrong only in red and green is a problem for ___. (a) fast typists (b) the battery (c) the server (d) colour-blind users
17. 17.🧪 One test case fails. Which one?
    📝 Rule: a quiz is passed with 8 or more right answers.
    function result(right) {
      if (right > 8) {
        return "Pass";
      }
      return "Try again";
    }
    Test 1: result(10) → expected Pass
    Test 2: result(8) → expected Pass
    Test 3: result(5) → expected Try again (a) Test 1 (b) Test 3 (c) Test 2
18. 18.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
19. 19.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let lives = 43; // start at 43
    line 2: lives = lives * 3; // double it
    line 3: lives = lives + 5; // add 5
    line 4: show(lives); // show it
20. 20.True or false: icons with no meaning is poor button design. (a) False (b) True
21. 21.🚀 Which version is newer: 2.8.7 or 2.8.18? (a) 2.8.7 (b) 2.8.18
22. 22.🔐 Which permission does a homework photo scanner really need? (a) the microphone (b) location (c) the camera (d) contacts
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 60 px tall
    Send button: 48 px tall
    Cancel button: 44 px tall (a) Send (b) Cancel (c) Next
24. 24.🧪 How many of these test cases pass?
    🚚 Rule: delivery is free (0) when the order is 400 or more; otherwise it costs 40.
    function delivery(total) {
      if (total > 400) {
        return 0;
      }
      return 40;
    }
    Test 1: delivery(300) → expected 40
    Test 2: delivery(400) → expected 0
    Test 3: delivery(600) → expected 0
25. 25.🧭 Which part of navigation hides extra links? (a) a tab bar (b) the back button (c) a menu button
26. 26.🔁 What is the LAST line this code shows?
    let names = ["Kabir", "Meera", "Aman"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Meera (b) Hi, Kabir (c) Hi, Aman
27. 27.💡 Which app idea solves this problem: friends argue over who pays? (a) a homework planner (b) a medicine reminder (c) a bill splitter (d) a lost-and-found board
28. 28.🛠️ At which stage do you let friends try it? (a) the plan stage (b) the idea stage (c) the build stage (d) the test stage
29. 29.🎨 Who should you test the UX with? (a) nobody (b) only yourself (c) real users (d) the app icon
30. 30.True or false: you add the buttons at the build stage. (a) False (b) True
31. 31.🔁 list.length tells you ___. (a) how many items it has (b) the biggest item (c) the first item (d) the last item
32. 32.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 33; // start at 32
    line 2: stars = stars - 5; // take away 5
    line 3: stars = stars * 2; // double it
    line 4: show(stars); // show it
33. 33.🗒️ A to-do app with no “add a task” feature is ___. (a) a nice extra (b) missing a must-have (c) ready to release (d) well planned
34. 34.Which of these is a user need? (a) a reminder alarm (b) “Small text is hard” (c) a search bar (d) a dark mode switch
35. 35.🗒️ You are planning version 1 of a bus tracker. Which feature can WAIT for a later version? (a) see where the bus is (b) change the bus icon (c) pick your bus stop (d) show arrival time
36. 36.🔀 What does if / else let an app do? (a) draw a screen (b) save a photo (c) repeat forever (d) pick one of two actions
37. 37.📊 Survey: which problem bugs you most? How many students voted in all?
    forgetting birthdays: 9 votes
    losing water bottles: 22 votes
    no quiet study place: 24 votes
38. 38.🔐 Which permission does a birthday list of friends really need? (a) contacts (b) the microphone (c) location (d) the camera
39. 39.🧰 What does this code show?
    function greet(name) {
      return "Well done, " + name + "!";
    }
    show(greet("Riya")); (a) Well done, Riya! (b) Well done, name! (c) Riya (d) greet
40. 40.🧰 What number does this code show?
    function total(price, qty) {
      return price * qty;
    }
    show(total(20, 4));

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