JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 58 · 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 books = 12;
   books = books + 3;
   books = books - 3;
   console.log(books);
2. 2.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) let
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Aman (c) name (d) Well done, name!
4. 4.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) 32 (b) 5 (c) Error
6. 6.⚡ What number does this code print?
   let books = 27;
   books = books + 19;
   books = books - 21;
   console.log(books);
7. 7.⚡ What number does this code print?
   let score = 15;
   score = score + 11;
   score = score - 8;
   console.log(score);
8. 8.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) if
9. 9.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
10. 10.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) console.log() (d) if
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) Error (c) 10
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) name (d) Well done, name!
13. 13.⚡ What number does this code print?
    let a = 7;
    let b = 5;
    console.log(a * b);
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Kabir (d) Hello, Kabir!
15. 15.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
17. 17.⚡ What number does this code print?
    let score = 23;
    score = score + 11;
    score = score - 15;
    console.log(score);
18. 18.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
19. 19.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 67 (b) 13 (c) Error
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) console.log()
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Well done, name! (d) Arjun
23. 23.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
24. 24.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
25. 25.⚡ What number does this code print?
    let books = 6;
    books = books + 11;
    books = books - 9;
    console.log(books);
26. 26.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
27. 27.⚡ What number does this code print?
    let a = 27;
    let b = 8;
    console.log(a - b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 27 (b) 9 (c) Error
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13
30. 30.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 3;
    marks = marks - 7;
    console.log(marks);
31. 31.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 17;
    apples = apples - 17;
    console.log(apples);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 42 (b) Error (c) 6
33. 33.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) Error (c) 15
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) name (d) Hi, name!
36. 36.⚡ What number does this code print?
    let a = 16;
    let b = 18;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
39. 39.⚡ What number does this code print?
    let a = 18;
    let b = 10;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) 10 (c) Error

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