JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 343 · 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 does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
2. 2.⚡ What number does this code print?
   let apples = 12;
   apples = apples + 15;
   apples = apples - 20;
   console.log(apples);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 6;
   console.log(x + y); (a) 14 (b) 86 (c) Error
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 1;
   console.log(x + y); (a) 2 (b) 11 (c) Error
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, Arjun! (d) Hello, name!
6. 6.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
7. 7.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
8. 8.⚡ What number does this code print?
   let a = 3;
   let b = 4;
   console.log(a * b);
9. 9.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
10. 10.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) console.log() (d) let
11. 11.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Zoya (d) Welcome, name!
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96
13. 13.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, Aman! (d) Hi, name!
14. 14.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) if
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) 77 (c) Error
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) console.log() (d) alert()
17. 17.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Aman (d) Welcome, Aman!
19. 19.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) Hello, name! (d) name
20. 20.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 5;
    marks = marks - 16;
    console.log(marks);
21. 21.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 84 (b) Error (c) 12
24. 24.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 9 (c) 27
27. 27.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Meera! (c) name (d) Meera
28. 28.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Riya! (d) Riya
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Welcome, name! (d) Aman
31. 31.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) if (d) for
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
33. 33.⚡ What number does this code print?
    let a = 38;
    let b = 25;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) Arjun (d) name
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) Error (c) 29
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) Error (b) 11 (c) 65
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Hi, name! (d) Aman
40. 40.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name

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