JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 212 · 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 print? (Look at the quotes!)
   let x = "8";
   let y = 6;
   console.log(x + y); (a) 14 (b) 86 (c) Error
2. 2.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
3. 3.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) for
4. 4.⚡ 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
5. 5.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
6. 6.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) console.log() (d) if
7. 7.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
8. 8.⚡ What number does this code print?
   let books = 11;
   books = books + 18;
   books = books - 3;
   console.log(books);
9. 9.⚡ What number does this code print?
   let a = 12;
   let b = 1;
   console.log(a - b);
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
11. 11.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
12. 12.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
13. 13.⚡ What number does this code print?
    let a = 29;
    let b = 2;
    console.log(a + b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 12 (c) 75
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
17. 17.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, name! (d) Well done, Aman!
18. 18.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
20. 20.⚡ What number does this code print?
    let a = 9;
    let b = 4;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 59;
    let b = 10;
    console.log(a + b);
22. 22.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) name (d) Hi, name!
23. 23.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
24. 24.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) Error (c) 73
26. 26.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) if
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) name (d) Welcome, Arjun!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 4 (c) 31
30. 30.⚡ What number does this code print?
    let a = 12;
    let b = 39;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) Hi, Aman! (d) name
33. 33.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 8;
    apples = apples - 6;
    console.log(apples);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 93 (b) 12 (c) Error
35. 35.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
36. 36.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Aman (d) Welcome, Aman!
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
38. 38.⚡ What number does this code print?
    let a = 13;
    let b = 33;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 47 (c) 11
40. 40.⚡ What number does this code print?
    let books = 19;
    books = books + 8;
    books = books - 6;
    console.log(books);

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