App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 969 · 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 number does this code show?
   let marks = [10, 19, 7, 18];
   let total = 0;
   for (let i = 0; i < marks.length; i++) {
     total = total + marks[i];
   }
   show(total);
2. 2.🔢 In a sign-up flow, which comes first: “open the app” or “type name and email”? (a) type name and email (b) open the app
3. 3.🔀 What is a user flow? (a) a colour theme (b) the path through screens (c) a type of font (d) a charging cable
4. 4.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
5. 5.🧪 A test case is an input together with its ___. (a) app icon (b) screen colour (c) font size (d) expected result
6. 6.Which of these happens at the idea stage? (a) let friends try it (b) list what users need (c) write down the bugs (d) write the store text
7. 7.👆 The user types Meera in nameBox and taps the button 1 time. What does the label show?
   button.onTap = function () {
     label.text = "Hello, " + nameBox.text + "!";
   }; (a) Meera (b) Hello, nameBox.text! (c) Hello! (d) Hello, Meera!
8. 8.🐞 Each comment says what its line SHOULD do. Which line has the bug?
   line 1: let coins = 46; // start at 46
   line 2: coins = coins * 2; // double it
   line 3: coins = coins + 6; // add 6
   line 4: coins = coins + 2; // double it
   line 5: show(coins); // show it (a) line 3 (b) line 1 (c) line 4 (d) line 2
9. 9.👥 A cricket club app has 185 players, 205 coaches and 160 fans as users. Which user group is the biggest? (a) players (b) coaches (c) fans
10. 10.💡 Does an app idea like a blank grey screen solve a real problem? (a) No (b) Yes
11. 11.🐞 This code has a bug. What number does it ACTUALLY show?
    line 1: let stars = 41; // start at 41
    line 2: stars = stars - 2; // take away 2
    line 3: stars = stars + 7; // add 4
    line 4: stars = stars * 2; // double it
    line 5: show(stars); // show it
12. 12.🔁 In for (let i = 0; i < 3; i++), which values does i take? (a) 1, 2, 3 (b) 3 (c) 0, 1, 2, 3 (d) 0, 1, 2
13. 13.🧭 The app has tabs Lessons, Quiz, Me. You start on Lessons, then:
    1. open “Match report”
    2. tap Back
    3. open “Video”
    4. tap the Me tab
    Which screen are you on now? (a) Video (b) Me (c) Lessons (d) Match report
14. 14.🗒️ You are planning version 1 of a pocket-money tracker. Which feature can WAIT for a later version? (a) add money received (b) show the balance (c) savings stickers (d) add money spent
15. 15.🖼️ In this wireframe (top to bottom), what is right below the title text?
    [ title text ]
    [ big picture ]
    [ menu icon ]
    [ top bar ] (a) menu icon (b) top bar (c) big picture
16. 16.🔐 Which permission does a selfie sticker app really need? (a) contacts (b) the microphone (c) the camera (d) location
17. 17.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let coins = 50; // start at 50
    line 2: coins = coins + 6; // add 6
    line 3: coins = coins * 3; // double it
    line 4: show(coins); // show it (a) line 2 (b) line 3 (c) line 1
18. 18.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Body text: 23 px
    Hint: 10 px
    Title: 17 px
    Label: 18 px (a) Hint (b) Body text (c) Title (d) Label
19. 19.💡 Which app idea solves this problem: students cannot find a quiet room? (a) a homework planner (b) a lost-and-found board (c) a study-room finder (d) a medicine reminder
20. 20.True or false: you connect the data at the build stage. (a) True (b) False
21. 21.📊 Survey: which problem bugs you most? Which problem should your app solve first?
    forgetting homework: 16 votes
    no quiet study place: 5 votes
    losing water bottles: 23 votes (a) forgetting homework (b) losing water bottles (c) no quiet study place
22. 22.True or false: a website has a home-screen icon. (a) False (b) True
23. 23.🚀 Which version is newer: 1.4.2 or 1.4.18? (a) 1.4.2 (b) 1.4.18
24. 24.💾 What number does this code show?
    let score = 5;
    score = score - 2;
    score = score + 2;
    show(score);
25. 25.🖼️ In this wireframe (top to bottom), what is right below the search box?
    [ search box ]
    [ top bar ]
    [ menu icon ]
    [ Save button ] (a) Save button (b) menu icon (c) top bar
26. 26.🔍 Which is the odd one out? (a) a unit converter (b) an alarm clock (c) a puzzle with levels (d) a torch
27. 27.True or false: an app that just says hi solves a real problem. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) sorting the scores (b) checking a password (c) working out a tip (d) a beep sound
29. 29.True or false: a big-text reader is the best fit for a grandparent with weak eyesight. (a) False (b) True
30. 30.🔁 What is the LAST line this code shows?
    let names = ["Aman", "Arjun", "Riya", "Zoya"];
    for (let i = 0; i < names.length; i++) {
      show("Hi, " + names[i]);
    } (a) Hi, Arjun (b) Hi, Riya (c) Hi, Zoya (d) Hi, Aman
31. 31.👆 The user taps the button 6 times. What number does the label show now?
    let lives = 8;
    button.onTap = function () {
      lives = lives + 1;
      label.text = lives;
    };
32. 32.✏️ What is a wireframe? (a) a charging cable (b) a type of password (c) a simple screen sketch (d) the finished app
33. 33.True or false: “text that can grow” makes the app harder to use. (a) True (b) False
34. 34.🎨 UI stands for user ___. (a) idea (b) internet (c) input (d) interface
35. 35.📅 An app team plans for 2 days, builds for 6 days, tests for 1 days and releases on 1 more day. How many days does the whole project take?
36. 36.🔁 What number does this code show?
    let steps = [44, 91, 40];
    let count = 0;
    for (let i = 0; i < steps.length; i++) {
      if (steps[i] >= 60) {
        count = count + 1;
      }
    }
    show(count);
37. 37.💾 What number does this code show?
    let friends = ["Riya", "Zoya", "Kabir"];
    friends.push("Arjun");
    friends.push("Aman");
    show(friends.length);
38. 38.📲 What happens when you tap an app’s icon? (a) the app opens (b) the app is deleted (c) the sound turns off (d) the phone charges
39. 39.True or false: today’s step count is an input. (a) True (b) False
40. 40.🎯 Which app would help this user most: a student who keeps forgetting due dates? (a) a bus tracker (b) a recipe finder (c) a homework planner (d) a water reminder

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