JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 463 · 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 = 15;
   let b = 6;
   console.log(a + b);
2. 2.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) name (d) Hello, name!
3. 3.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
4. 4.⚡ What number does this code print?
   let marks = 12;
   marks = marks + 3;
   marks = marks - 8;
   console.log(marks);
5. 5.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
6. 6.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) for
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
8. 8.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
9. 9.⚡ What number does this code print?
   let books = 11;
   books = books + 18;
   books = books - 17;
   console.log(books);
10. 10.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 6;
    coins = coins - 12;
    console.log(coins);
12. 12.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
13. 13.⚡ What number does this code print?
    let a = 3;
    let b = 6;
    console.log(a * b);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
15. 15.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) let (d) if
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Aman (d) Hello, name!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) 97 (c) Error
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) 44 (c) Error
19. 19.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
20. 20.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
21. 21.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
22. 22.⚡ What number does this code print?
    let a = 57;
    let b = 10;
    console.log(a - b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 14 (c) 77
24. 24.⚡ What number does this code print?
    let a = 59;
    let b = 15;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) 52 (c) Error
27. 27.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) let (d) for
28. 28.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let
29. 29.⚡ What number does this code print?
    let a = 29;
    let b = 8;
    console.log(a + b);
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) name (d) Hi, name!
31. 31.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 10;
    apples = apples - 10;
    console.log(apples);
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) Welcome, Aman! (d) name
33. 33.⚡ What number does this code print?
    let books = 22;
    books = books + 6;
    books = books - 1;
    console.log(books);
34. 34.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 2;
    runs = runs - 6;
    console.log(runs);
35. 35.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) console.log() (d) if
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
37. 37.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Meera (c) Welcome, Meera! (d) Welcome, name!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) 35 (c) Error
39. 39.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
40. 40.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);

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