JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 369 · 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 number does this code print?
   let a = 6;
   let b = 12;
   console.log(a * b);
2. 2.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) let (d) alert()
4. 4.⚡ What number does this code print?
   let score = 16;
   score = score + 3;
   score = score - 8;
   console.log(score);
5. 5.⚡ What number does this code print?
   let marks = 18;
   marks = marks + 3;
   marks = marks - 11;
   console.log(marks);
6. 6.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 1;
   console.log(x + y); (a) 11 (b) 2 (c) Error
8. 8.⚡ 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
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 4;
   console.log(x + y); (a) Error (b) 9 (c) 54
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) Welcome, Zoya! (d) name
11. 11.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) if (d) let
12. 12.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) alert()
13. 13.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
14. 14.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) for (d) console.log()
15. 15.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
16. 16.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
17. 17.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) alert()
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) Error (c) 9
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
20. 20.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 15;
    coins = coins - 15;
    console.log(coins);
21. 21.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) Error (c) 4
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
24. 24.⚡ What number does this code print?
    let books = 22;
    books = books + 14;
    books = books - 23;
    console.log(books);
25. 25.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
26. 26.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) Welcome, Kabir! (d) name
27. 27.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) 11 (c) Error
30. 30.⚡ 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
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) 15 (c) Error
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 5 (c) 14
33. 33.⚡ What number does this code print?
    let score = 5;
    score = score + 16;
    score = score - 1;
    console.log(score);
34. 34.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 7;
    apples = apples - 8;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let a = 35;
    let b = 18;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 13;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 24;
    let b = 22;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) 19 (c) Error
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 10 (c) 82

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