JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 323 · 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 show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
2. 2.⚡ What number does this code print?
   let coins = 5;
   coins = coins + 3;
   coins = coins - 5;
   console.log(coins);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 3;
   console.log(x + y); (a) 10 (b) Error (c) 73
4. 4.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
5. 5.⚡ What number does this code print?
   let books = 28;
   books = books + 6;
   books = books - 23;
   console.log(books);
6. 6.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Riya (d) Hello, Riya!
7. 7.⚡ What number does this code print?
   let apples = 22;
   apples = apples + 17;
   apples = apples - 22;
   console.log(apples);
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) alert() (d) let
9. 9.⚡ What number does this code print?
   let marks = 21;
   marks = marks + 11;
   marks = marks - 21;
   console.log(marks);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 79 (c) 16
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) Error (c) 92
12. 12.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) let (d) for
13. 13.⚡ What number does this code print?
    let a = 37;
    let b = 13;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
15. 15.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) Error (c) 34
17. 17.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
18. 18.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
19. 19.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) for (d) if
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) 49 (c) Error
21. 21.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let books = 20;
    books = books + 3;
    books = books - 8;
    console.log(books);
23. 23.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 16;
    marks = marks - 5;
    console.log(marks);
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
25. 25.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) console.log() (d) if
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 4 (c) 31
27. 27.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 10;
    runs = runs - 9;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 24 (c) 6
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Riya! (d) Riya
31. 31.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 27 (b) Error (c) 9
33. 33.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
34. 34.⚡ What number does this code print?
    let a = 21;
    let b = 8;
    console.log(a - b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 91 (c) 10
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) name (d) Welcome, Meera!
37. 37.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) for
38. 38.⚡ What number does this code print?
    let a = 34;
    let b = 39;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 87 (b) Error (c) 15
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) Error (c) 8

Free html and css lessons, practice and worksheets at talentjr.in/html-css-for-kids