JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 647 · 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.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) if
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
3. 3.⚡ What number does this code print?
   let a = 5;
   let b = 6;
   console.log(a * b);
4. 4.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) alert()
5. 5.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
6. 6.⚡ What number does this code print?
   let a = 57;
   let b = 24;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let a = 7;
   let b = 9;
   console.log(a + b);
8. 8.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
10. 10.⚡ What number does this code print?
    let a = 60;
    let b = 28;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
12. 12.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
13. 13.⚡ What number does this code print?
    let books = 9;
    books = books + 5;
    books = books - 14;
    console.log(books);
14. 14.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 20;
    marks = marks - 16;
    console.log(marks);
15. 15.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 6;
    marks = marks - 2;
    console.log(marks);
16. 16.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
17. 17.⚡ What number does this code print?
    let score = 6;
    score = score + 5;
    score = score - 3;
    console.log(score);
18. 18.⚡ What number does this code print?
    let books = 22;
    books = books + 18;
    books = books - 9;
    console.log(books);
19. 19.⚡ What number does this code print?
    let a = 20;
    let b = 4;
    console.log(a + b);
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
21. 21.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) let
22. 22.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) console.log() (d) let
23. 23.⚡ What number does this code print?
    let a = 41;
    let b = 23;
    console.log(a - b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
25. 25.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 11;
    apples = apples - 1;
    console.log(apples);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 91 (c) 10
27. 27.⚡ What number does this code print?
    let a = 48;
    let b = 23;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 18;
    marks = marks - 25;
    console.log(marks);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, name! (d) Hello, Meera!
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) Error (c) 9
32. 32.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 11;
    runs = runs - 26;
    console.log(runs);
33. 33.⚡ 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
34. 34.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a - b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) Error (c) 46
36. 36.⚡ What number does this code print?
    let a = 45;
    let b = 21;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let score = 30;
    score = score + 19;
    score = score - 40;
    console.log(score);
38. 38.⚡ What number does this code print?
    let books = 14;
    books = books + 16;
    books = books - 29;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) name (d) Well done, Meera!
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, name! (d) Well done, Zoya!

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