JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 94 · 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 = "3";
   let y = 7;
   console.log(x + y); (a) Error (b) 37 (c) 10
2. 2.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) let
3. 3.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
4. 4.⚡ What number does this code print?
   let coins = 19;
   coins = coins + 3;
   coins = coins - 1;
   console.log(coins);
5. 5.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
6. 6.⚡ What number does this code print?
   let coins = 28;
   coins = coins + 8;
   coins = coins - 32;
   console.log(coins);
7. 7.⚡ What number does this code print?
   let a = 4;
   let b = 4;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let a = 50;
   let b = 30;
   console.log(a + b);
9. 9.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
10. 10.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Aman (d) Hello, Aman!
11. 11.⚡ What number does this code print?
    let a = 58;
    let b = 9;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 40;
    let b = 12;
    console.log(a - b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) 36 (c) Error
14. 14.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 23 (c) 5
16. 16.⚡ What number does this code print?
    let a = 6;
    let b = 29;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let a = 45;
    let b = 31;
    console.log(a - b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) Error (c) 45
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) console.log() (d) alert()
20. 20.⚡ What number does this code print?
    let score = 6;
    score = score + 20;
    score = score - 10;
    console.log(score);
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
22. 22.⚡ What number does this code print?
    let a = 15;
    let b = 27;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 5;
    coins = coins - 3;
    console.log(coins);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96
26. 26.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a * b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
28. 28.⚡ What number does this code print?
    let score = 22;
    score = score + 9;
    score = score - 1;
    console.log(score);
29. 29.⚡ What number does this code print?
    let a = 59;
    let b = 26;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) Error (c) 7
32. 32.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) alert() (d) for
33. 33.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
34. 34.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) if
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 26 (b) 8 (c) Error
36. 36.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) if (d) console.log()
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
38. 38.⚡ What number does this code print?
    let books = 24;
    books = books + 2;
    books = books - 14;
    console.log(books);
39. 39.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
40. 40.⚡ What number does this code print?
    let a = 15;
    let b = 33;
    console.log(a + b);

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