JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 353 · 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 JavaScript word repeats code? (a) alert() (b) console.log() (c) let (d) for
3. 3.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
4. 4.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
6. 6.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Welcome, name! (d) Meera
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) console.log() (d) alert()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 6;
   console.log(x + y); (a) 26 (b) 8 (c) Error
9. 9.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
10. 10.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) alert()
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) Error (c) 9
12. 12.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 11;
    marks = marks - 19;
    console.log(marks);
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Riya (d) Hello, Riya!
14. 14.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, Riya! (d) Welcome, name!
15. 15.⚡ What number does this code print?
    let books = 17;
    books = books + 2;
    books = books - 12;
    console.log(books);
16. 16.⚡ What number does this code print?
    let a = 31;
    let b = 37;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let a = 59;
    let b = 30;
    console.log(a + b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) Error (b) 66 (c) 12
19. 19.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
20. 20.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 18;
    marks = marks - 3;
    console.log(marks);
21. 21.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) if (d) console.log()
22. 22.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 2;
    runs = runs - 26;
    console.log(runs);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 57 (b) 12 (c) Error
24. 24.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
25. 25.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
26. 26.⚡ What number does this code print?
    let a = 16;
    let b = 2;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Kabir (d) Welcome, name!
28. 28.⚡ What number does this code print?
    let books = 23;
    books = books + 3;
    books = books - 18;
    console.log(books);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) Error (c) 36
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) Error (c) 8
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) Well done, Aman! (d) name
32. 32.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
33. 33.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) name (d) Zoya
36. 36.⚡ What number does this code print?
    let a = 13;
    let b = 2;
    console.log(a - b);
37. 37.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) Error (c) 10
39. 39.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 5;
    marks = marks - 3;
    console.log(marks);
40. 40.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);

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