App Dev Worksheet: Final Test

App development lesson 24: App development final test · Set 772 · 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.🔢 In a sign-up flow, which comes LAST? (a) see the home screen (b) tap “Sign up” (c) open the app (d) enter the code sent
2. 2.🔁 What number does this code show?
   let runs = [89, 20, 73, 80, 27];
   let count = 0;
   for (let i = 0; i < runs.length; i++) {
     if (runs[i] >= 50) {
       count = count + 1;
     }
   }
   show(count);
3. 3.🔀 In this course’s code, which sign tests “is equal to”? (a) === (b) => (c) !== (d) =
4. 4.🧰 What number does this code show?
   function total(price, qty) {
     return price * qty;
   }
   show(total(85, 4));
5. 5.🧭 The app has tabs Home, Search, Profile. You start on Home, then:
   1. open “Match report”
   2. open “Edit photo”
   3. open “Map”
   4. tap Back
   Which screen are you on now? (a) Map (b) Edit photo (c) Home (d) Match report
6. 6.🔢 When you make an app, which comes FIRST? (a) plan the screens (b) test the app (c) get an idea (d) release it
7. 7.🗒️ A to-do app with no “add a task” feature is ___. (a) well planned (b) ready to release (c) a nice extra (d) missing a must-have
8. 8.💾 What does this code show? (Positions start at 0.)
   let friends = ["Aman", "Meera", "Zoya", "Kabir"];
   show(friends[1]); (a) Zoya (b) Meera (c) Kabir (d) Aman
9. 9.👆 The user taps the button 6 times. What number does the label show now?
   let likes = 0;
   button.onTap = function () {
     if (likes < 4) {
       likes = likes + 1;
     }
     label.text = likes;
   };
10. 10.🧪 A test case is an input together with its ___. (a) screen colour (b) expected result (c) font size (d) app icon
11. 11.Which of these happens at the plan stage? (a) try every button (b) write the code (c) list what users need (d) sketch the screens
12. 12.🧰 How do you run (call) a function called greet? (a) greet() (b) run greet (c) greet[] (d) #greet
13. 13.Which colour pair is hard to read? (a) dark blue on white (b) black on yellow (c) light grey on white (d) white on dark green
14. 14.♿ Our rule: text is at least 16 px. Which text on this screen is too small?
    Caption: 12 px
    Footer: 17 px
    Body text: 20 px (a) Body text (b) Footer (c) Caption
15. 15.👆 Code that runs when an event happens is called a ___. (a) hashtag (b) header (c) headline (d) handler
16. 16.💡 Does an app idea like a lost-and-found board solve a real problem? (a) No (b) Yes
17. 17.🧰 Why write a function? (a) to slow the app (b) to make code longer (c) to reuse code (d) to hide errors
18. 18.🧩 What do we call one full page of an app? (a) a screen (b) a variable (c) a battery (d) a cable
19. 19.🚀 A privacy policy tells users ___. (a) the screen size (b) what data is collected (c) the app’s price (d) the app’s colours
20. 20.🔁 What does a loop do? (a) saves photos (b) deletes code (c) repeats code (d) draws icons
21. 21.⚙️ What number does this app show?
    let bill = 195; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.🔁 Why use a loop to show 100 messages? (a) less code to write (b) it hides them (c) it uses more lines (d) it is slower
23. 23.🔁 What number does this code show?
    let steps = [16, 5, 10, 10, 5];
    let total = 0;
    for (let i = 0; i < steps.length; i++) {
      total = total + steps[i];
    }
    show(total);
24. 24.💾 Where should the app save your last game level: on the phone or in the cloud? (a) on the phone (b) in the cloud
25. 25.🐞 This code has a bug. What number SHOULD it show, if every line did what its comment says?
    line 1: let stars = 46; // start at 46
    line 2: stars = stars + 2; // double it
    line 3: stars = stars - 3; // take away 3
    line 4: show(stars); // show it
26. 26.🐞 Each comment says what its line SHOULD do. Which line has the bug?
    line 1: let stars = 45; // start at 45
    line 2: stars = stars - 6; // take away 5
    line 3: stars = stars - 5; // take away 5
    line 4: show(stars); // show it (a) line 3 (b) line 2 (c) line 1
27. 27.True or false: a recipe finder is the best fit for a teen learning to make snacks. (a) False (b) True
28. 28.Which of these happens at the release stage? (a) draw the user flow (b) share the download link (c) try every button (d) list what users need
29. 29.📊 Survey: which problem bugs you most? How many more votes did “forgetting homework” get than “missing the bus”?
    forgetting homework: 25 votes
    missing the bus: 14 votes
    losing water bottles: 17 votes
30. 30.🐞 After fixing a bug you should ___. (a) release at once (b) never test (c) delete the test (d) test it again
31. 31.🔁 What number does this code show?
    let runs = [15, 3, 4, 17, 6];
    let total = 0;
    for (let i = 0; i < runs.length; i++) {
      total = total + runs[i];
    }
    show(total);
32. 32.🔢 In a quiz-app flow, what comes right after “see if it is right”? (a) read a question (b) pick an answer (c) tap “Start quiz” (d) see the final score
33. 33.Which of these is a screen? (a) tap to Start (b) tap to Save (c) tap to Send (d) the game-over page
34. 34.🚀 Which version is newer: 3.6.11 or 3.6.5? (a) 3.6.11 (b) 3.6.5
35. 35.🎯 Which app would help this user most: a runner who forgets to sip water? (a) a pocket-money tracker (b) a bus tracker (c) a water reminder (d) a big-text reader
36. 36.🗒️ You are planning version 1 of a pocket-money tracker. Which feature can WAIT for a later version? (a) show the balance (b) add money spent (c) pie-chart colours (d) add money received
37. 37.💾 What number does this code show?
    let points = 9;
    points = points - 4;
    points = points + 2;
    show(points);
38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 52 px tall
    Back button: 60 px tall
    Done button: 60 px tall
    Cancel button: 64 px tall
39. 39.📅 An app team plans for 4 days, builds for 8 days, tests for 1 days and releases on 1 more day. How many days does the whole project take?
40. 40.♿ Our rule: text is at least 16 px. How many texts on this screen are too small?
    Hint: 22 px
    Caption: 15 px
    Footer: 15 px
    Menu: 14 px

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