JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 168 · 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.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
2. 2.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) alert()
3. 3.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) console.log() (d) alert()
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 3;
   console.log(x + y); (a) 93 (b) 12 (c) Error
5. 5.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
8. 8.⚡ What number does this code print?
   let marks = 9;
   marks = marks + 11;
   marks = marks - 19;
   console.log(marks);
9. 9.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) let
10. 10.⚡ What number does this code print?
    let books = 19;
    books = books + 11;
    books = books - 6;
    console.log(books);
11. 11.⚡ What number does this code print?
    let a = 49;
    let b = 31;
    console.log(a - b);
12. 12.⚡ What number does this code print?
    let books = 21;
    books = books + 20;
    books = books - 19;
    console.log(books);
13. 13.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
14. 14.⚡ What number does this code print?
    let a = 60;
    let b = 34;
    console.log(a + b);
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) console.log() (d) let
16. 16.⚡ What number does this code print?
    let a = 58;
    let b = 34;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 2;
    apples = apples - 3;
    console.log(apples);
18. 18.⚡ What number does this code print?
    let score = 8;
    score = score + 19;
    score = score - 1;
    console.log(score);
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) name (d) Well done, name!
20. 20.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
22. 22.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) console.log() (d) if
23. 23.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) name (d) Zoya
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 87 (b) 15 (c) Error
25. 25.⚡ What number does this code print?
    let books = 11;
    books = books + 10;
    books = books - 16;
    console.log(books);
26. 26.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
27. 27.⚡ What number does this code print?
    let a = 36;
    let b = 5;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, name! (d) Hello, Riya!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) Error (c) 10
30. 30.⚡ What number does this code print?
    let score = 25;
    score = score + 17;
    score = score - 32;
    console.log(score);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
32. 32.⚡ What number does this code print?
    let a = 19;
    let b = 16;
    console.log(a + b);
33. 33.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) 29 (c) Error
36. 36.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 46;
    let b = 16;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 27;
    let b = 15;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let books = 6;
    books = books + 9;
    books = books - 3;
    console.log(books);
40. 40.⚡ What number does this code print?
    let books = 12;
    books = books + 4;
    books = books - 1;
    console.log(books);

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