JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 765 · 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 = 5;
   console.log(a + b);
2. 2.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) console.log()
3. 3.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) console.log()
4. 4.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
5. 5.⚡ What number does this code print?
   let coins = 11;
   coins = coins + 13;
   coins = coins - 7;
   console.log(coins);
6. 6.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) let
7. 7.⚡ What number does this code print?
   let coins = 20;
   coins = coins + 13;
   coins = coins - 8;
   console.log(coins);
8. 8.⚡ What number does this code print?
   let a = 15;
   let b = 34;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let runs = 19;
   runs = runs + 7;
   runs = runs - 18;
   console.log(runs);
10. 10.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
11. 11.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 16 (b) Error (c) 88
13. 13.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 66 (b) 12 (c) Error
15. 15.⚡ What number does this code print?
    let a = 13;
    let b = 11;
    console.log(a - b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) 23 (c) Error
17. 17.⚡ What number does this code print?
    let a = 35;
    let b = 33;
    console.log(a - b);
18. 18.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 49 (c) 13
20. 20.⚡ What number does this code print?
    let score = 27;
    score = score + 16;
    score = score - 25;
    console.log(score);
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) Well done, name! (d) name
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) name (d) Hi, name!
23. 23.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) Error (c) 14
26. 26.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) console.log() (d) let
27. 27.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
29. 29.⚡ What number does this code print?
    let score = 16;
    score = score + 9;
    score = score - 10;
    console.log(score);
30. 30.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Hi, name! (d) Kabir
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Meera (d) Hi, name!
32. 32.⚡ What number does this code print?
    let books = 5;
    books = books + 9;
    books = books - 1;
    console.log(books);
33. 33.⚡ What number does this code print?
    let books = 18;
    books = books + 5;
    books = books - 4;
    console.log(books);
34. 34.⚡ What number does this code print?
    let books = 5;
    books = books + 8;
    books = books - 12;
    console.log(books);
35. 35.⚡ What number does this code print?
    let a = 57;
    let b = 40;
    console.log(a + b);
36. 36.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) let (d) console.log()
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) Riya (d) name
38. 38.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let books = 22;
    books = books + 17;
    books = books - 20;
    console.log(books);
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, name! (d) Hello, Aman!

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