JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 879 · 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 = 19;
   let b = 25;
   console.log(a + b);
2. 2.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name
3. 3.⚡ What number does this code print?
   let a = 6;
   let b = 3;
   console.log(a * b);
4. 4.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
5. 5.⚡ What number does this code print?
   let a = 54;
   let b = 27;
   console.log(a + b);
6. 6.⚡ What does this code show?
   let name = "Meera";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Meera (d) Well done, Meera!
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 1;
   console.log(x + y); (a) Error (b) 41 (c) 5
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 7;
   console.log(x + y); (a) 67 (b) Error (c) 13
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
11. 11.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
12. 12.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) console.log()
13. 13.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
14. 14.⚡ 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
15. 15.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 9;
    marks = marks - 8;
    console.log(marks);
16. 16.⚡ What number does this code print?
    let score = 10;
    score = score + 9;
    score = score - 2;
    console.log(score);
17. 17.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
18. 18.⚡ What number does this code print?
    let books = 15;
    books = books + 4;
    books = books - 2;
    console.log(books);
19. 19.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 12 (c) 93
21. 21.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a - b);
22. 22.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) 13 (c) Error
24. 24.⚡ What number does this code print?
    let a = 53;
    let b = 12;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 8;
    marks = marks - 13;
    console.log(marks);
26. 26.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 4;
    coins = coins - 10;
    console.log(coins);
27. 27.⚡ 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
28. 28.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Kabir! (d) Kabir
30. 30.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
32. 32.⚡ What number does this code print?
    let books = 21;
    books = books + 4;
    books = books - 6;
    console.log(books);
33. 33.⚡ What number does this code print?
    let a = 10;
    let b = 7;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
35. 35.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) Well done, name! (d) name
36. 36.⚡ What number does this code print?
    let a = 57;
    let b = 29;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 11;
    let b = 18;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 38;
    let b = 35;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) Riya (d) name
40. 40.⚡ What number does this code print?
    let books = 16;
    books = books + 6;
    books = books - 7;
    console.log(books);

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