JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 713 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 5;
   console.log(x + y); (a) 11 (b) Error (c) 65
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) 32 (b) 5 (c) Error
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 1;
   console.log(x + y); (a) 7 (b) Error (c) 61
4. 4.⚡ What number does this code print?
   let a = 38;
   let b = 32;
   console.log(a + b);
5. 5.⚡ What number does this code print?
   let apples = 10;
   apples = apples + 16;
   apples = apples - 13;
   console.log(apples);
6. 6.⚡ What number does this code print?
   let a = 4;
   let b = 6;
   console.log(a * b);
7. 7.⚡ What does this code show?
   let name = "Arjun";
   console.log("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) name (d) Welcome, Arjun!
8. 8.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) if
9. 9.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) for (d) alert()
10. 10.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) Error (c) 29
13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) name (d) Hi, name!
14. 14.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 10;
    apples = apples - 19;
    console.log(apples);
15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
16. 16.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, Kabir! (d) Well done, name!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 12 (b) Error (c) 75
18. 18.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) name (c) Kabir (d) Hello, name!
19. 19.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 18;
    marks = marks - 29;
    console.log(marks);
20. 20.⚡ What number does this code print?
    let books = 26;
    books = books + 8;
    books = books - 16;
    console.log(books);
21. 21.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 16;
    apples = apples - 11;
    console.log(apples);
22. 22.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
23. 23.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 8;
    marks = marks - 15;
    console.log(marks);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) Error (b) 85 (c) 13
25. 25.⚡ What number does this code print?
    let a = 35;
    let b = 32;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) Error (c) 59
27. 27.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
29. 29.⚡ What number does this code print?
    let books = 27;
    books = books + 3;
    books = books - 6;
    console.log(books);
30. 30.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) if
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, name! (c) name (d) Hello, Zoya!
32. 32.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) name (d) Arjun
33. 33.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 5;
    coins = coins - 18;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let books = 6;
    books = books + 17;
    books = books - 3;
    console.log(books);
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) Riya (d) name
36. 36.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
37. 37.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
38. 38.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
40. 40.⚡ What number does this code print?
    let a = 12;
    let b = 25;
    console.log(a + b);

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